阅读说明：本技术 一种改善疲劳强度的型材连接结构 (Improve fatigue strength's section bar connection structure ) 是由 王永健 张帆 张伟 黎国龙 徐凯 余志成 王克强 史中华 刘林 于 2020-12-02 设计创作，主要内容包括：本发明公开了一种改善疲劳强度的型材连接结构,包括母材、垂直固定在母材上的肋板和型材,所述肋板上设置有切口,型材从切口中垂直穿过并通过补板与肋板相固定,所述补板为其中两个对角设置为切角的矩形板,所述补板的远离母材的侧边上开设有槽口。本发明通过改善补板缺口的形状,将危险点的峰值应力降下来,进而有效地提高构件的疲劳强度或延长其疲劳寿命,并起到轻量化的作用。(The invention discloses a section bar connecting structure for improving fatigue strength, which comprises a base material, a rib plate and a section bar, wherein the rib plate and the section bar are vertically fixed on the base material, a notch is formed in the rib plate, the section bar vertically penetrates through the notch and is fixed with the rib plate through a supplementing plate, the supplementing plate is a rectangular plate, two opposite angles of the rectangular plate are arranged to be cut angles, and a notch is formed in the side edge of the supplementing plate, which is far away from the base material. The invention reduces the peak stress of the dangerous point by improving the shape of the gap of the patch, thereby effectively improving the fatigue strength of the component or prolonging the fatigue life of the component and playing a role of light weight.)

1. The section bar connecting structure is characterized by comprising a base material, a rib plate and a section bar, wherein the rib plate and the section bar are vertically fixed on the base material, a notch is formed in the rib plate, the section bar vertically penetrates through the notch and is fixed with the rib plate through a supplementing plate, the supplementing plate is a rectangular plate, two opposite angles of the rectangular plate are arranged to be cut angles, and a notch is formed in the side edge, far away from the base material, of the supplementing plate.

2. The connecting structure for the sectional materials for improving the fatigue strength as claimed in claim 1, wherein a plurality of water flow holes are further opened on the patch.

3. The fatigue strength-improved profile connecting structure according to claim 2, wherein the water flow holes are round holes.

4. The fatigue strength-improved profile connecting structure according to claim 1 or 2, wherein the length of the patch is determined according to the size of the cut on the rib.

5. The improved fatigue strength profile connecting structure according to claim 1, wherein the notch is an arc-shaped groove.

6. The fatigue strength-improved profile connecting structure according to claim 5, wherein when the profile height is less than 100mm, the radius of the circular arc of the notch is 15 mm;

when the height of the section bar is less than 140mm and not less than 100mm, the arc radius of the notch is 25 mm;

when the height of the section bar is not less than 140mm, the arc radius of the notch is 35 mm.

7. The fatigue strength-improved profile connection structure according to claim 1 or 6, wherein the profile is a bulb flat steel or an angle steel or a T-shaped profile.

Technical Field

The invention relates to the technical field of ship construction, in particular to a section bar connecting structure for improving fatigue strength.

Background

Due to the repeated action of alternating wave load, in the case that the alternating stress born by the ship body part or the component does not reach the allowable stress of static strength design, the local position of the ship body part or the component generates fatigue crack and expands, and finally, the ship body part or the component is suddenly broken, and the phenomenon is called fatigue failure.

Fatigue crack formation and propagation is highly concealed and prompt at fatigue fracture, so fatigue failure often results in significant economic loss and catastrophic consequences. The fatigue failure modes and mechanisms of metals are different from static load failure, so the design calculation of the fatigue strength of the ship body parts cannot be replaced by the classical static strength design calculation, and the ship body parts belong to dynamic strength design.

With the rapid development of modern propagation towards high speed, high power and unlimited navigation areas, the requirements for fatigue strength and reliability thereof are also higher and higher. In recent years, many fatigue fracture accidents have occurred, and thus fatigue cracks of ship parts or members are receiving more and more attention. Fatigue strength design and its research is becoming an indispensable and important task in ship design.

The fatigue fracture is caused by further propagation of a fatigue crack which is generated in a region of a surface layer of a hull part or member where the strength is high or low. These dangerous portions are as small as several millimeters or even tens of micrometers, and the root of a geometric notch, surface defects, cutting marks, collision scratches, internal defects of a material, and the like of a part or a component are often the dangerous portions.

Disclosure of Invention

In view of the above, the present invention provides a profile connection structure with improved fatigue strength, which reduces the peak stress at a dangerous point by improving the shape of a gap of a patch, thereby effectively improving the fatigue strength of a member or prolonging the fatigue life thereof, and achieving the effect of light weight.

A section bar connecting structure for improving fatigue strength comprises a base material, a rib plate and a section bar, wherein the rib plate and the section bar are vertically fixed on the base material, a notch is formed in the rib plate, the section bar vertically penetrates through the notch and is fixed with the rib plate through a supplementing plate, the supplementing plate is a rectangular plate, two opposite angles of the rectangular plate are arranged to be cut angles, and a notch is formed in the side edge, far away from the base material, of the supplementing plate.

Preferably, the patch plate is further provided with a plurality of water flow holes.

Preferably, the water flow holes are round holes.

Preferably, the length of the patch is determined according to the size of the cut on the rib plate.

Preferably, the notch is an arc-shaped slot.

Preferably, when the height of the profile is less than 100mm, the arc radius of the notch is 15 mm;

when the height of the section bar is less than 140mm and not less than 100mm, the arc radius of the notch is 25 mm;

when the height of the section bar is not less than 140mm, the arc radius of the notch is 35 mm.

Preferably, the profile is a flat-bulb steel or angle steel or T-shaped profile.

The invention has the beneficial effects that:

the invention can reduce the peak stress of the dangerous point by arranging the patch plate at the joint of the section bar and the ribbed slab, namely the notch of the ribbed slab and setting the patch plate into a specific shape, thereby effectively improving the fatigue strength of the member or prolonging the fatigue life of the member and achieving the effect of light weight.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is one of the structural schematic diagrams of the present invention when the profile is a bulb steel.

Fig. 2 is a second schematic structural view of the present invention when the profile is flat bulb steel.

Fig. 3 is a schematic structural diagram of the invention when the section bar is an angle steel.

Fig. 4 is one of the structural schematic diagrams of the present invention when the profile is a T-profile.

Fig. 5 is a second schematic structural view of the present invention when the profile is a T-profile.

Fig. 6 is a schematic structural view of the patch.

The reference numerals in the figures have the meaning:

1 is a base material, 2 is a ribbed plate, 3 is a section, 4 is a notch, 5 is a supplement plate, 6 is a notch, and 7 is a drain hole.

Detailed Description

For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.

It should be understood that the described embodiments are only some embodiments of the invention, and not all 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.

The present application is described in further detail below with reference to specific embodiments and with reference to the attached drawings.

In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described with reference to the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

The invention provides a section bar connecting structure for improving fatigue strength, which comprises a base material 1, a rib plate 2 vertically fixed on the base material 1 and a section bar 3.

The rib plate 2 is provided with a notch 4, and the section bar 3 vertically penetrates through the notch 4 and is fixed with the rib plate 2 through a patch 5.

The patch panel 5 is a rectangular panel with two opposite corners as cut corners, and a notch 6 is formed in the side edge of the patch panel 5 far away from the base material 1.

Preferably, the patch 5 is further provided with a plurality of water flow holes 7.

In this embodiment, the water flowing hole 7 is a circular hole, and the notch 6 is an arc-shaped groove.

When the height of the section bar 3 is less than 100mm, the arc radius of the notch 6 is 15 mm;

when the height of the section bar 3 is less than 140mm and not less than 100mm, the arc radius of the notch 6 is 25 mm;

when the height of the section bar 3 is not less than 140mm, the arc radius of the notch 6 is 35 mm.

The section bar 3 is made of flat-bulb steel or angle steel or a T-shaped section bar.

The length of the patch 5 is determined according to the size of the notch 4 on the rib plate, and the length of the patch 5 can be equal to the width of the notch 4 on the rib plate or slightly larger than the width of the notch 4 on the rib plate. When the length of the patch 5 is equal to the width of the notch 4 on the rib plate, the patch 5 is embedded in the notch 4, one end of the patch is welded and fixed on the section bar 3, and the other end of the patch is welded and fixed on the notch wall of the rib plate. When the length of the patch 5 is larger than the width of the notch 4 on the rib plate, one end of the patch 5 is abutted against the section bar 3, and the other end is fixed on the surface of the rib plate at one side of the notch 4 in an overlapping manner.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.