阅读说明：本技术 一种整体壁板结构损伤断裂主动控制的试验方法 (Test method for actively controlling damage and fracture of integral wallboard structure ) 是由 宁宇 张志楠 庄茁 王恒 柳占立 秦剑波 于 2021-06-11 设计创作，主要内容包括：本发明公开了一种整体壁板结构损伤断裂主动控制的试验方法,涉及飞行器结构损伤容限试验领域,所述方法包括：确定整体壁板结构的设计参数和试验件；在试验件上引入第一组裂纹,在指定试验载荷谱下,对第一组裂纹进行裂纹扩展试验,记录试验数据,当符合预设条件时,停止试验,并对第一组裂纹进行裂纹修复和补强；对裂纹修复和补强后的试验件,引入第二组裂纹,并重复上述步骤直至裂纹扩展试验次数达到预设次数时,根据记录得到的所有试验数据,计算试验件的每一组裂纹对应的裂纹扩展速率和应力强度因子,进而得到所述多组设计参数中相对最优的一组设计。本发明提升了低成本、高效率的结构损伤容限试验验证能力,具有较高的实用性。(The invention discloses a test method for actively controlling damage and fracture of an integral wallboard structure, which relates to the field of aircraft structure damage tolerance tests, and comprises the following steps: determining design parameters and a test piece of the integral wall plate structure; introducing a first group of cracks on a test piece, performing a crack propagation test on the first group of cracks under a specified test load spectrum, recording test data, stopping the test when preset conditions are met, and performing crack repair and reinforcement on the first group of cracks; and introducing a second group of cracks into the test piece after crack repair and reinforcement, repeating the steps until the crack propagation test times reach preset times, and calculating the crack propagation rate and the stress intensity factor corresponding to each group of cracks of the test piece according to all recorded test data so as to obtain a relatively optimal group of designs in the multiple groups of design parameters. The invention improves the structure damage tolerance test verification capability with low cost and high efficiency and has higher practicability.)

1. A test method for actively controlling structural damage and fracture of an integral wallboard is characterized by comprising the following steps:

step S1: determining design parameters of the unitary wallboard structure, the design parameters including: multiple groups of design parameters formed by combining different rib intervals and rib areas;

step S2: determining a connection mode of a loading transition section for transferring load when the integral wallboard structure under the design parameters is tested, wherein the integral wallboard structure under the design parameters and the loading transition section jointly form a test piece;

step S3: introducing a first set of cracks on the test piece and determining the location, type and size of the first set of cracks;

step S4: under a specified test load spectrum, performing a crack propagation test on the first group of cracks, recording test data, stopping the test when preset conditions are met, and performing crack repair and reinforcement on the first group of cracks;

step S5: introducing a second group of cracks into the test piece after crack repair and reinforcement, determining the position, type and size of the second group of cracks, and executing the following steps: under a specified test load spectrum, performing a crack propagation test on the second group of cracks, recording test data, stopping the test when preset conditions are met, and performing crack repair and reinforcement on the second group of cracks;

step S6: and repeatedly executing the steps S3 to S5 until the crack propagation test times reach the preset times, and calculating the crack propagation rate and the stress intensity factor corresponding to each group of cracks of the test piece according to all recorded test data so as to obtain a relatively optimal group of design parameters in the multiple groups of design parameters.

2. The test method of claim 1, wherein determining design parameters of the unitary panel structure comprises:

and forming a plurality of groups of design parameters by taking a target rib among the plurality of ribs, the rib area corresponding to the target rib and the skin thickness as a group of design parameters, wherein the target rib is a rib with the same rib interval.

3. The test method of claim 1, wherein introducing a first set of cracks on the test piece and determining the location, type, and size of the first set of cracks comprises:

introducing the first group of cracks at the center of the skin between any two adjacent ribs on the test piece;

or, introducing the first group of cracks on the ribs which are positioned in the center of all the ribs on the test piece;

if the first group of cracks are in the center position of the skin, assuming that the first group of cracks are penetrating cracks, and the length of the first group of cracks meets the preset length;

if the first group of cracks are positioned on the ribs at the central positions of all the ribs, the first group of cracks need to cut all the ribs.

4. The test method of claim 1, wherein the first set of cracks is crack propagation tested at a specified test load spectrum, and wherein recording test data comprises:

and performing a crack propagation test on the first group of cracks under a specified test load spectrum, and recording the crack propagation track, the crack propagation length and the test load cycle number of the first group of cracks.

5. The test method according to claim 2, wherein the preset conditions include:

the crack propagation trajectories of the first set of cracks reach adjacent fillets; or

The crack propagation length of the first group of cracks reaches a preset multiple of the rib spacing.

6. The test method of claim 1, wherein the first set of cracks are located at a different position than the second set of cracks;

the type and size of the first set of cracks may be the same or different than the type and size of the second set of cracks.

7. The test method according to claim 1, wherein the predetermined number of times is determined according to the number of ribs, and the calculation expression is as follows:

the preset times are (the number of ribs is-1)/2.

8. The assay of claim 5, wherein the predetermined multiple is twice three.

9. The testing method of claim 3, wherein assuming the first set of cracks are through cracks if the first set of cracks are in the skin center location, the first set of cracks having a length that satisfies a predetermined length comprises: and drilling a hole with a preset diameter in the center of the skin, and cutting the first group of cracks by adopting a linear cutting mode, wherein the first group of cracks are assumed to be penetrating cracks, and the length of the first group of cracks is not less than 8 mm.

10. Test method according to claim 9, characterized in that said predetermined diameter is 3 mm.

Technical Field

The invention relates to the field of aircraft structure damage tolerance tests, in particular to a test method for actively controlling damage and fracture of an integral wallboard structure.

Background

Monolithic panels have found use in a variety of medium and large aircraft structures due to their advantages of good fatigue performance, simplicity of manufacture, and light weight construction. However, compared with the traditional riveted wallboard, the integral wallboard lacks a natural crack arrest original piece, namely a rivet for connecting the stringer and the skin, so that the damage tolerance performance is poorer.

However, in the current research, the point of aiming is local, the designed integral wallboard needs to be subjected to a large amount of analysis and test verification work, the structural parameters of a test piece are multiple, the test design is difficult, the integral wallboard structures under a large number of different design parameters need to be manufactured for test verification and comparative analysis work, a large amount of test expenditure is consumed, a large amount of test time also needs to be consumed, the structural design and verification work efficiency of the integral wallboard is low, the cost is high, and the design cycle and the installation effect of the large integral wallboard structure are limited.

Disclosure of Invention

In view of the above problems, the present invention provides a global control method for damage and fracture of an integral panel structure, and provides a technical solution for solving or partially solving the above problems, in order to solve the problems that a large number of structural parameters of a test piece are large and an integral panel structure under a large number of different design parameters needs to be manufactured for test verification and comparative analysis.

The embodiment of the invention provides a test method for actively controlling structural damage and fracture of an integral wallboard, which comprises the following steps:

step S1: determining design parameters of the unitary wallboard structure, the design parameters including: multiple groups of design parameters formed by combining different rib intervals and rib areas;

step S2: determining a connection mode of a loading transition section for transferring load when the integral wallboard structure under the design parameters is tested, wherein the integral wallboard structure under the design parameters and the loading transition section jointly form a test piece;

step S3: introducing a first set of cracks on the test piece and determining the location, type and size of the first set of cracks;

step S4: under a specified test load spectrum, performing a crack propagation test on the first group of cracks, recording test data, stopping the test when preset conditions are met, and performing crack repair and reinforcement on the first group of cracks;

step S5: introducing a second group of cracks into the test piece after crack repair and reinforcement, determining the position, type and size of the second group of cracks, and executing the following steps: under a specified test load spectrum, performing a crack propagation test on the second group of cracks, recording test data, stopping the test when preset conditions are met, and performing crack repair and reinforcement on the second group of cracks;

step S6: and repeatedly executing the steps S3 to S5 until the crack propagation test times reach the preset times, and calculating the crack propagation rate and the stress intensity factor corresponding to each group of cracks of the test piece according to all recorded test data so as to obtain a relatively optimal group of design parameters in the multiple groups of design parameters.

Optionally, determining design parameters of the unitary panel structure comprises:

and forming a plurality of groups of design parameters by taking a target rib among the plurality of ribs, the rib area corresponding to the target rib and the skin thickness as a group of design parameters, wherein the target rib is a rib with the same rib interval.

Optionally, introducing a first group of cracks on the test piece, and determining the position, type and size of the first group of cracks includes:

introducing the first group of cracks at the center of the skin between any two adjacent ribs on the test piece;

or, introducing the first group of cracks on the ribs which are positioned in the center of all the ribs on the test piece;

if the first group of cracks are in the center position of the skin, assuming that the first group of cracks are penetrating cracks, and the length of the first group of cracks meets the preset length;

if the first group of cracks are positioned on the ribs at the central positions of all the ribs, the first group of cracks need to cut all the ribs.

Optionally, under a specified test load spectrum, performing a crack propagation test on the first group of cracks, and recording test data, including:

and performing a crack propagation test on the first group of cracks under a specified test load spectrum, and recording the crack propagation track, the crack propagation length and the test load cycle number of the first group of cracks.

Optionally, the preset conditions include:

the crack propagation trajectories of the first set of cracks reach adjacent fillets; or

The crack propagation length of the first group of cracks reaches a preset multiple of the rib spacing.

Optionally, the first set of cracks is located at a different position than the second set of cracks;

the type and size of the first set of cracks may be the same or different than the type and size of the second set of cracks.

Optionally, the preset times are determined according to the number of the ribs, and a calculation expression of the preset times is as follows:

the preset times are (the number of ribs is-1)/2.

Optionally, the preset multiple is two thirds.

Optionally, if the first group of cracks is located in the center of the skin, assuming that the first group of cracks are through cracks, and the length of the first group of cracks satisfies a preset length, the method includes: and drilling a hole with a preset diameter in the center of the skin, and cutting the first group of cracks by adopting a linear cutting mode, wherein the first group of cracks are assumed to be penetrating cracks, and the length of the first group of cracks is not less than 8 mm. 10. Test method according to claim 9, characterized in that said predetermined diameter is 3 mm.

The invention provides a test method for actively controlling damage and fracture of an integral wallboard structure, which aims at different sets of design parameters under the integral wallboard structure, determines the connection mode of a loading transition section for transferring load when the integral wallboard structure under a first set of design parameters is tested, and the integral wallboard structure and the loading transition section under the design parameters can jointly form a test piece.

When the test is carried out, introducing a first group of cracks on a test piece, and determining the position, the type and the size of the first group of cracks; performing a crack propagation test on the first group of cracks under a specified test load spectrum, recording test data, stopping the test when preset conditions are met, and performing crack repair and reinforcement on the first group of cracks; then, introducing a second group of cracks into the test piece after crack repair and reinforcement, determining the position, type and size of the second group of cracks, and executing the following steps again: under the appointed test load spectrum, carrying out a crack propagation test on the second group of cracks, recording test data, stopping the test when the test data meet the preset conditions, and carrying out crack repair and reinforcement on the second group of cracks; and repeating the steps until the crack propagation test times reach the preset times, and calculating the crack propagation rate and the stress intensity factor corresponding to each group of cracks of the test piece according to all the recorded test data.

And comparing the crack propagation rate and the stress intensity factor corresponding to each group of cracks to obtain a relatively optimal group of design parameters in the multiple groups of design parameters.

By adopting the test method, the existing integral wallboard test piece is changed, all the parameters of the ribs and the skin are consistent, one test piece can only verify one group of optimized parameters, if a plurality of groups of optimized parameters need to be verified, the state of the test piece with a plurality of groups of parameters needs to be designed, and the period and the cost of the test piece are relatively high due to the state. According to the test method provided by the invention, different groups of optimized structural parameters (namely design parameters) are adopted on the same test piece, and by designing a multifunctional integral wallboard test piece with multiple groups of compatible structural control parameters, under the action of the same test load, a transition section design form is utilized, so that the test verification work under the multiple groups of structural control parameters is realized, and the purpose of verifying multiple groups of parameters by one test piece is realized, therefore, the design cost and the verification period are greatly reduced, the structural damage tolerance test verification capability with low cost and high efficiency is improved, and the test method has higher practicability.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a flow chart of a method for optimizing damage tolerance of an integral panel in accordance with an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a test piece used in the test method for active damage and fracture control of monolithic panel structures according to the embodiment of the present invention;

FIG. 3 is a schematic representation of the area of the ribs in a test piece according to an embodiment of the present invention;

FIG. 4 is a schematic illustration of the spacing of the ribs in a test piece according to an embodiment of the present invention;

FIG. 5 shows an embodiment of the present invention, which determines the connection mode of the loading transition section for transferring load when a test piece is tested;

FIG. 6 is a schematic illustration of the introduction of multiple sets of cracks on a defined test piece in an embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention, but do not limit the invention to only some, but not all embodiments.

Referring to fig. 1, a flow chart of a test method for active damage and fracture control of a monolithic wallboard structure according to an embodiment of the present invention is shown, the test method comprising:

step S1: determining design parameters of the unitary panel structure, the design parameters including: and multiple groups of design parameters formed by combining different rib intervals and rib areas.

In the embodiment of the invention, the design parameters of the integral wallboard structure are multiple, wherein three key factors influencing the damage and fracture of the integral wallboard structure are respectively as follows: rib area, rib spacing, and skin thickness. In general, the design parameters include: and multiple groups of design parameters formed by combining different rib intervals and rib areas. The specific determination method of the three parameters can be performed according to the existing technology, and the embodiment of the present invention is not particularly limited.

The specific process for determining the design parameters of the integral wall plate structure comprises the following steps:

and forming a plurality of groups of design parameters by taking the target rib among the plurality of ribs, the rib area corresponding to the target rib and the skin thickness as a group of design parameters, wherein the target rib is a rib with the same rib spacing.

Referring to fig. 2, a schematic structural diagram of a test piece used in the test method for active damage and fracture control of the integral wall panel structure according to the embodiment of the invention is shown. In fig. 2, 1 denotes a skin, 2 denotes a transition section, and 3 denotes a rib. Referring to FIG. 3, which shows a schematic representation of the area of the ribs in a test piece in an embodiment of the present invention, like reference numerals refer to like elements. Referring to fig. 4, which shows a schematic diagram of the spacing of the ribs in the test piece in the example of the present invention, like reference numerals refer to like meanings.

Assuming that the area of the ribs is respectively: s₁、S₂And S₃In which S is₁＝80mm²，S₂＝120mm²And S₃＝160mm²(ii) a The rib spacing is respectively: w1 and W2, wherein W₁＝160mm，W₂180mm, the skin thickness t is 2 mm. Selecting S from the areas of the three ribs₁＝80mm²As the first rib area; the rib spacings are combined as first rib spacings, and as shown in fig. 4, the rib spacings from left to right in sequence are respectively: 160mm, 180mm, 160mm, 180mm, 160 mm.

Take a total of 7 bars on the test piece as an example: suppose that the 7 bars are numbered sequentially as: 1-7#, if the rib pitch of the 1# -2# is the same as that of the 6# -7# rib, taking the 1#, 2#, 6# and 7# ribs as target ribs, taking the rib pitch of the 1# -2#, the rib pitch of the 6# -7# ribs, and the respective rib areas and skin thicknesses of the 1#, 2#, 6# and 7# ribs as a first group of design parameters, and carrying out a crack propagation test on the integral wallboard structure under the first group of design parameters;

the rib spacing of the No. 1-2 is different from that of the No. 2-3, but the rib spacing of the No. 2-3 is the same as that of the No. 5-6, and then the No. 2, the No. 3, the No. 5 and the No. 6 ribs are used as target ribs, and the crack propagation test is carried out on the whole wallboard structure under the second set of design parameters by using the rib spacing of the No. 2-3, the rib spacing of the No. 5-6, the respective rib areas of the No. 2, the No. 3, the No. 5 and the No. 6 ribs and the skin thickness as the second set of design parameters.

And by analogy, if the rib spacing of the 3# -4# is the same as that of the 4# -5# but is different from that of the previous two groups, taking the 3#, 4# and 5# ribs as target ribs, and taking the rib spacing of the 3# -4# and the rib spacing of the 4# -5# ribs, and the respective rib areas and skin thicknesses of the 3#, 4# and 5# ribs as third group design parameters to perform a crack propagation test on the integral wallboard structure under the third group design parameters.

Step S2: and when the integral wallboard structure under the design parameters is tested, determining the connection mode of the loading transition section for transferring the load, wherein the integral wallboard structure and the loading transition section under the design parameters jointly form a test piece.

In the embodiment of the invention, after the design parameters are determined, the connection mode of the loading transition section for transferring the load is determined when the integral wallboard structure under the design parameters is tested, and the connection mode of the loading transition section for transferring the load can be adjusted according to the actual situation when the test is carried out. The test piece is formed by the integral wall plate structure and the loading transition section under the design parameters.

As shown in FIG. 5, the test piece is determined to be tested, wherein a load transition section for transferring load is connected, and the same reference numerals represent the same meanings. The transfer of the load to the test piece can be ensured by the design of the transition section.

Step S3: a first set of cracks is introduced on the test piece and the location, type and size of the first set of cracks is determined.

In the embodiment of the invention, after the test piece is formed, in the test process, a first group of cracks are introduced on the test piece, and the positions, types and sizes of the first group of cracks are determined.

Generally, the initial crack damage position of the integral wallboard structure can be selected from two positions: the center position of the skin among all ribs is the second center rib. Therefore, a first group of cracks can be introduced into the center position of the skin between any two adjacent ribs on the test piece; alternatively, a first set of cracks may be introduced on the bars located centrally on all bars on the test piece.

If the first group of cracks are in the center of the skin, the first group of cracks are assumed to be penetrating cracks, and the length of the first group of cracks meets the preset length. Generally, a hole with a preset diameter of 3 mm can be drilled at the center of the skin, that is, a hole with a diameter of 3 mm is drilled at the center of the skin, and a first group of cracks are cut by adopting a wire cutting method, assuming that the first group of cracks are penetrating cracks, and the length of the first group of cracks is not less than 8 mm. If the first set of cracks is in the center of all the bars, the first set of cracks need to cut all the bars.

As shown in fig. 6, a schematic diagram of introducing multiple groups of cracks on a determined test piece, wherein 601 denotes that the cracks introduced on the skin of the test piece at the left and right S3 areas are introduced, and the cracks are introduced at the center of the skin; identifying cracks introduced on the skin of the test piece at the left and right S2 areas, wherein the cracks are also introduced at the center of the skin; 603 identifies a crack introduced on the skin of the test piece at the location of the central S1 zone.

Step S4: and under the appointed test load spectrum, carrying out a crack propagation test on the first group of cracks, recording test data, stopping the test when the test data meet preset conditions, and carrying out crack repair and reinforcement on the first group of cracks.

In the embodiment of the invention, after all the information of the first group of cracks is determined, the crack propagation test can be carried out on the first group of cracks under the specified test load spectrum, the test data is recorded, when the preset conditions are met, the test is stopped, and the crack repair and reinforcement are carried out on the first group of cracks. Specifically, the method comprises the following steps:

and performing a crack propagation test on the first group of cracks under a specified test load spectrum, and recording the crack propagation track, the crack propagation length and the test load cycle number of the first group of cracks. When the crack propagation path of the first group of cracks reaches the position adjacent to the ribs; or when the crack propagation length of the first group of cracks reaches the preset multiple of the rib spacing, stopping the test, and performing crack repair and reinforcement on the first group of cracks. Typically, the predetermined multiple is two-thirds, i.e., when the crack propagation path of the first set of cracks reaches the adjacent ribs; or when the crack propagation length of the first group of cracks reaches two thirds of the distance between two adjacent ribs, stopping the test, and repairing and reinforcing the cracks of the first group.

Step S5: introducing a second group of cracks into the test piece after crack repair and reinforcement, determining the position, type and size of the second group of cracks, and executing the following steps: and under the appointed test load spectrum, carrying out a crack propagation test on the second group of cracks, recording test data, stopping the test when the test data meet the preset conditions, and carrying out crack repair and reinforcement on the second group of cracks.

In the embodiment of the invention, after the test is stopped and the first group of cracks are repaired and reinforced, the second group of cracks can be introduced and the position, the type and the size of the second group of cracks can be determined. The position of the second set of cracks must be different from the position of the first set of cracks; the type and size of the second set of cracks may be the same as or different from the type and size of the first set of cracks.

Then the steps are executed again: and under the appointed test load spectrum, carrying out a crack propagation test on the second group of cracks, recording test data, stopping the test when the test data meet the preset conditions, and carrying out crack repair and reinforcement on the second group of cracks. For example: referring to FIG. 6, for the first set of design parameters, the first set of cracks introduced was shown as 601, for the second set of design parameters, the second set of cracks introduced was shown as 602, and for the third set of design parameters, the third set of cracks introduced was shown as 603. That is, for different sets of design parameters, the crack introduced at each time can be determined according to actual requirements. Introducing a first group of cracks 601 at the center position of the skin between the ribs of the number 1# -2#, introducing the first group of cracks 601 at the center position of the skin between the ribs of the number 6# -7#, performing a crack propagation test on the first group of cracks 601 under a specified test load spectrum, recording test data, stopping the test when preset conditions are met, and performing crack repair and reinforcement on the first group of cracks 601. And then, introducing a second group of cracks 602 at the center positions of the skins between the ribs of No. 2 and No. 3, introducing a second group of cracks 602 at the center positions of the skins between the ribs of No. 5 and No. 6, performing a crack propagation test on the second group of cracks 602 under a specified test load spectrum, recording test data, stopping the test when preset conditions are met, and performing crack repair and reinforcement on the second group of cracks 602. And performing a crack propagation test on the third group of cracks 603 according to the same method, recording test data, stopping the test when preset conditions are met, and performing crack repair and reinforcement on the third group of cracks 603.

Step S6: and repeatedly executing the step S3 to the step S5 until the crack propagation test times reach the preset times, and calculating the crack propagation rate and the stress intensity factor corresponding to each group of cracks of the test piece according to all the recorded test data so as to obtain a relatively optimal group of design parameters in the multiple groups of design parameters.

In the embodiment of the invention, different groups of cracks are introduced, and the steps S3-S5 are repeatedly executed until the number of crack propagation tests reaches the preset number, the preset number is determined according to the number of ribs, and the calculation expression is as follows: the preset times are (the number of ribs is-1)/2.

That is, the test is not repeated until the number of crack propagation tests reaches (the number of ribs is-1)/2, and at this time, a plurality of groups of test data are recorded in the test, and if a total of three groups of cracks are introduced, the test data recorded in the test are as follows: crack propagation trajectory, crack propagation length, and number of test load cycles for the first set of cracks; crack propagation trajectories, crack propagation lengths, and test load cycle numbers for the second set of cracks; crack propagation trajectory, crack propagation length, and number of test load cycles for the third set of cracks.

For the test data, the crack propagation rate and the stress intensity factor corresponding to each group of cracks of the test piece are calculated according to all the recorded test data. And comparing to obtain a relatively optimal set of design parameters under the N sets of design parameters, and by the method, the test verification and comparative analysis work of the whole wallboard structures under a large number of different design parameters is not required to be manufactured.

In summary, according to the test method for actively controlling damage and fracture of the integral wall panel structure provided by the embodiment of the invention, for different sets of design parameters under the integral wall panel structure, the connection mode of the loading transition section for transmitting load when the integral wall panel structure under the first set of design parameters is tested is determined, and the integral wall panel structure and the loading transition section under the design parameters can jointly form a test piece.

When the test is carried out, introducing a first group of cracks on a test piece, and determining the position, the type and the size of the first group of cracks; performing a crack propagation test on the first group of cracks under a specified test load spectrum, recording test data, stopping the test when preset conditions are met, and performing crack repair and reinforcement on the first group of cracks; then, introducing a second group of cracks into the test piece after crack repair and reinforcement, determining the position, type and size of the second group of cracks, and executing the following steps again: under the appointed test load spectrum, carrying out a crack propagation test on the second group of cracks, recording test data, stopping the test when the test data meet the preset conditions, and carrying out crack repair and reinforcement on the second group of cracks; and repeating the steps until the crack propagation test times reach the preset times, and calculating the crack propagation rate and the stress intensity factor corresponding to each group of cracks of the test piece according to all the recorded test data.

And comparing the crack propagation rate and the stress intensity factor corresponding to each group of cracks to obtain a relatively optimal group of design parameters in the multiple groups of design parameters.

By adopting the test method, the existing integral wallboard test piece is changed, all the parameters of the ribs and the skin are consistent, one test piece can only verify one group of optimized parameters, if a plurality of groups of optimized parameters need to be verified, the state of the test piece with a plurality of groups of parameters needs to be designed, and the period and the cost of the test piece are relatively high due to the state. According to the test method provided by the invention, different groups of optimized structural parameters (namely design parameters) are adopted on the same test piece, and by designing a multifunctional integral wallboard test piece with multiple groups of compatible structural control parameters, under the action of the same test load, a transition section design form is utilized, so that the test verification work under the multiple groups of structural control parameters is realized, and the purpose of verifying multiple groups of parameters by one test piece is realized, therefore, the design cost and the verification period are greatly reduced, the structural damage tolerance test verification capability with low cost and high efficiency is improved, and the test method has higher practicability.

It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or article that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or article.

The embodiments of the present invention have been described in connection with the accompanying drawings, and the principles and embodiments of the present invention are described herein using specific examples, which are provided only to help understand the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.