阅读说明：本技术 一种轮印载荷作用下的i型夹层结构设计方法 (Design method of I-shaped sandwich structure under action of wheel print load ) 是由 王海洋 贺远松 张攀 何秦 王福花 陆屿 于 2020-07-29 设计创作，主要内容包括：本发明公开了一种轮印载荷作用下的I型夹层结构设计方法,其特征在于,步骤一：确定芯层间距；步骤二：根据芯层间距和上铺板最小厚度公式<Image he="189" wi="307" file="DDA0002607537280000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>确定上铺板的最小板厚；步骤三：根据上铺板的厚度确定下铺板的厚度；步骤四：根据船体甲板承载类型(飞机、车辆)确定芯层腹板高度；步骤五：根据夹层结构的弯曲、剪切稳定性要求确定芯层厚度；步骤六：最后验证夹层结构的最小剖面模数、最小惯性矩、最小剪切面积及稳定性是否符合标准。这种方法根据甲板或平台结构所承受的典型作业载荷(轮印载荷),确定载荷作用位置及工况,分析夹层结构构件受力特征,确定构件最危险位置及相应合理的数学理论计算模型,推导出简单实用的计算公式,最终形成一套轮印载荷作用下针对船体甲板或平台的I型夹层结构设计方法。(The invention discloses a design method of an I-shaped sandwich structure under the action of wheel print load, which is characterized by comprising the following steps: determining the distance between the core layers; step two: according to the formula of the distance between the core layers and the minimum thickness of the upper plank Determining the minimum plate thickness of the upper plank; step three: determining the thickness of the lower paving plate according to the thickness of the upper paving plate; step four: determining the height of a core layer web according to the deck bearing type (airplane and vehicle) of a ship body; step five: determining the thickness of a core layer according to the bending and shearing stability requirements of the sandwich structure; step six: and finally, verifying whether the minimum section modulus, the minimum moment of inertia, the minimum shearing area and the stability of the sandwich structure meet the standard or not. The method comprises the steps of determining the action position and working condition of a load according to a typical operation load (wheel mark load) borne by a deck or platform structure, analyzing the stress characteristics of a sandwich structure member, determining the most dangerous position of the member and a corresponding reasonable mathematical theory calculation model, and deducingAnd a simple and practical calculation formula finally forms a set of design method of the I-shaped sandwich structure aiming at the ship deck or the platform under the action of the wheel print load.)

1. A design method of an I-shaped sandwich structure under the action of wheel print load is characterized by comprising the following steps: determining the distance between the core layers; step two: according to the formula of the distance between the core layers and the minimum thickness of the upper plankDetermining the minimum plate thickness of the upper plank; step three: determining the thickness of the lower paving plate according to the thickness of the upper paving plate; step four: determining the height of a core layer web according to the deck bearing type (airplane and vehicle) of a ship body; step five: according to the bending and shearing stability requirements of the core layer web

2. A method as claimed in claim 1, wherein the core distance in step one is generally 80mm to 200 mm.

3. A method for designing a sandwich structure of type I according to claim 1, wherein the thickness of the upper decking in step two is not less than 3 mm.

4. A method for designing a sandwich structure according to claim 1, wherein the thickness of the lower plank in the third step is half of that of the upper plank and cannot be less than 3 mm.

5. A method according to claim 1, wherein the height of the core in the fourth step is generally related to deck load type, the height of the core is generally 200mm to 300mm for aircraft, and 160mm to 250mm for vehicles.

6. A method as claimed in claim 1, wherein the thickness of the core layer in step five is generally between the thickness of the upper plank and the thickness of the lower plank, and cannot be less than 3 mm.

7. The design method of an I-shaped sandwich structure according to claim 1, wherein in the sixth step, the sandwich structure is equivalently simulated into an I-shaped frame, and then the performances are verified according to a formula.

Technical Field

The invention relates to a design method of an I-shaped sandwich structure under the action of wheel print load, and belongs to the field of ship deck design.

Background

Along with the offshore trend of ships in China to the open sea, in order to resist the harsher marine environment and carry more equipment, the ships are inevitably required to have higher bearing capacity, protective capacity and the like, but no matter which aspect of capacity is improved, the cost is weight and space resources, so that a novel light structure is necessary to be applied to replace the traditional stiffened plate structure, the structural design of the ship body is optimized, the weight of the ship body is reduced, and the bearing capacity, the protective capacity and the like of the ship body are enhanced.

The metal sandwich structure is a sandwich structure formed by connecting upper and lower metal panels and metal sandwich cores such as corrugated type, honeycomb type and truss type through laser welding technology. Compared with the traditional stiffened plate structure, the stiffened plate structure has the characteristics of high specific stiffness and high specific strength, and has excellent performances in the aspects of fatigue, impact resistance, explosion impact resistance, vibration and noise reduction, fire prevention, heat insulation and the like. In addition, the sandwich structure can be constructed in a modularized manner, so that the ship performance is greatly improved, and the construction period is shortened. The metal sandwich structure is used as a novel structure for future engineering application, and has wide application prospect in the field of ships.

Under the background, the reliability and feasibility of implementation are fully considered, a reasonable theoretical derivation formula is selected according to typical operation loads (wheel mark loads) on a ship flight deck and a vehicle deck, and finally a design method of an I-type sandwich structure is given out to guide the design of a hull structure.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: how to accurately and precisely design an I-shaped sandwich structure so that the design requirement of a ship body can be met.

In order to solve the technical problems, the technical scheme of the inventionThe scheme provides a design method of an I-shaped sandwich structure under the action of wheel printing load, which is characterized by comprising the following steps: determining the distance between the core layers; step two: according to the formula of the distance between the core layers and the minimum thickness of the upper plankDetermining the minimum plate thickness of the upper plank; step three: determining the thickness of the lower paving plate according to the thickness of the upper paving plate; step four: determining the height of a core layer web according to the deck bearing type (airplane and vehicle) of a ship body; step five: determining the thickness of a core layer according to the bending and shearing stability requirements of the sandwich structure; step six: and finally, verifying whether the minimum section modulus, the minimum moment of inertia, the minimum shearing area and the stability of the sandwich structure meet the standard or not.

Preferably, the distance between the core layers in the step one is generally 80mm-200 mm.

Preferably, the thickness of the upper paving plate in the second step is not less than 3 mm.

Preferably, the thickness of the lower plank in the third step is half of that of the upper plank and cannot be less than 3 mm.

Preferably, the thickness of the core layer in the fifth step is between the thickness of the upper plank and the thickness of the lower plank, and cannot be less than 3 mm.

Preferably, in the sixth step, the sandwich structure is equivalently simulated into an I-shaped frame, and then each performance is verified according to a formula

The invention provides a design method of an I-shaped sandwich structure under the action of a wheel print load, which can help a designer quickly and conveniently design a deck I-shaped sandwich structure under the action of the wheel print load at the design stage of a hull structure scheme.

Drawings

FIG. 1 is a schematic illustration of boundary condition calculation for a sandwich upper decking;

FIG. 2 is a schematic view of a sandwich panel equivalent to an I-beam;

FIG. 3 is a schematic illustration of the line equivalent load acting on an I-beam;

FIG. 4 is a schematic view of the stress distribution of a core web under a wheel mark load;

FIG. 5 is a schematic diagram of a sandwich design process.

Detailed Description

In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.