A test piece for verifying the effect of assembly stress on life

Abstract

The present application belongs to the field of aviation structure design technology, and particularly relates to a test piece for verifying the influence of assembly stress on life. It comprises: a test piece, the test piece having an area of ​​interest and a loading area; a mounting part, the mounting part having an area of ​​interest and a loading area; wherein the area of ​​interest of the test piece and the area of ​​interest of the mounting part are assembled by fasteners, and an assembly gap is provided at the assembly position; the loading area of ​​the test piece and the loading area of ​​the mounting part are used to implement the application of load. The test piece for verifying the influence of assembly stress on life of the present application has a simple and efficient structure, an easy-to-implement process, and a short production cycle; different test piece loading schemes are selected according to the load form of the test piece, and structural assembly under different gap values ​​is achieved by replacing the mounting parts; it is easy to install and has good engineering applicability.

Description

Technical Field

[0001] The present application belongs to the technical field of aviation structure design, and in particular relates to a test piece for verifying the influence of assembly stress on service life. Background Art

[0002] During the assembly of aircraft components, gaps between them are created due to machining errors and accumulated tolerances. Later, when bolts are installed and tightened, assembly stress is generated. The magnitude of this assembly stress is related to the size of the gap. This assembly stress can cause stress corrosion, which can affect the life of the aircraft.

[0003] Therefore, it is desired to have a technical solution to overcome or at least alleviate at least one of the above-mentioned deficiencies of the prior art. Summary of the Invention

[0004] The purpose of the present application is to provide a test piece for verifying the influence of assembly stress on life, so as to solve at least one problem existing in the prior art.

[0005] The technical solution of this application is:

[0006] A test piece for verifying the effect of assembly stress on life, comprising:

[0007] a test piece having a region of interest and a loading zone;

[0008] a mounting member having a region of interest and a loading zone;

[0009] in,

[0010] The area of ​​interest of the test piece and the area of ​​interest of the mounting piece are assembled by fasteners, and an assembly gap is provided at the assembly position;

[0011] The loading area of ​​the test piece and the loading area of ​​the mounting piece are used to implement load application.

[0012] In at least one embodiment of the present application, the test piece includes a tensile test piece and a shear test piece, and the mounting piece includes a tensile mounting piece and a shear mounting piece, wherein:

[0013] The tensile test piece is used in conjunction with the tensile mounting piece to verify the effect of assembly stress on service life under tensile load;

[0014] The shear test piece is matched with the shear mounting piece to verify the influence of assembly stress on service life under shear load.

[0015] In at least one embodiment of the present application,

[0016] The tensile test piece includes a tensile test piece body, the middle portion of the tensile test piece body is a focus area, and both ends are loading areas. A first vertical rib is provided on one side of the middle portion of the tensile test piece body, and mounting holes are provided on the tensile test piece body and the first vertical rib.

[0017] The tension mounting member includes a tension mounting member body, the tension mounting member body is adapted to the tension test member body, the middle portion is a focus area, and both ends are loading areas, a second vertical rib is provided on one side of the middle portion of the tension mounting member body, the tension mounting member body and the second vertical rib are both provided with mounting holes, and the tension mounting member and the tension test member are connected by fasteners;

[0018] The area of ​​interest of the tension mounting member body has a thickness difference relative to other parts of the tension mounting member body, so that after the tension test piece is assembled with the tension mounting member, an assembly gap is formed between the area of ​​interest of the tension mounting member body and the area of ​​interest of the tension test piece body.

[0019] In at least one embodiment of the present application, a first reinforcing rib is provided between the tensile test piece body and the first vertical rib.

[0020] In at least one embodiment of the present application, the area of ​​interest of the tension mounting piece and the area of ​​interest of the tension test piece are connected by bolts;

[0021] The loading area of ​​the tension mounting piece is connected to the loading area of ​​the tension test piece through countersunk rivets.

[0022] In at least one embodiment of the present application, the tension mounting piece includes a plurality of different specifications, and the focus areas of the tension mounting piece body of the tension mounting pieces of different specifications have different thickness differences relative to other parts of the tension mounting piece body. The assembly gap value between the tension test piece and the tension mounting piece is adjusted by replacing the tension mounting piece.

[0023] In at least one embodiment of the present application,

[0024] The shear test piece includes a shear test piece body, the middle portion of the shear test piece body is a focus area, and first lugs extend downward from both ends. The first lugs serve as loading areas, and a mounting hole is provided on the shear test piece body.

[0025] The shear mounting piece includes a shear test piece body, the shear test piece body is adapted to the shear test piece body, the middle portion is a focus area, a second lug extends upward from the middle portion, the second lug serves as a loading area, a mounting hole is opened on the shear test piece body, and the shear mounting piece is connected to the shear test piece via fasteners;

[0026] The area of ​​interest of the shear mounting member body has a thickness difference relative to other parts of the shear mounting member body, so that after the shear test piece is assembled with the shear mounting member, an assembly gap is formed between the area of ​​interest of the shear mounting member body and the area of ​​interest of the shear test piece body.

[0027] In at least one embodiment of the present application, a second reinforcing rib is provided on the main body of the shear test piece.

[0028] In at least one embodiment of the present application, the area of ​​interest of the shear mounting member and the area of ​​interest of the shear test piece are connected by bolts.

[0029] In at least one embodiment of the present application, the shear mounting member includes a plurality of different specifications, and the focus areas of the shear mounting member body of the shear mounting members of different specifications have different thickness differences relative to other parts of the shear mounting member body, and the assembly gap value between the shear test piece and the shear mounting member is adjusted by replacing the shear mounting member.

[0030] The invention has at least the following beneficial technical effects:

[0031] The test piece for verifying the influence of assembly stress on life in this application has a simple and efficient structure, an easy-to-implement process, and a short production cycle. Different test piece loading schemes are selected according to the load form of the test piece, and structural assembly under different gap values ​​is achieved by replacing the mounting parts. The test piece is easy to install and has good engineering applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of a test piece for verifying the effect of assembly stress on life under a tensile load according to one embodiment of the present application;

[0033] Figure 2 yes Figure 1 Another angle view of;

[0034] Figure 3 This is a schematic diagram of a test piece for verifying the effect of assembly stress on life under shear load according to one embodiment of the present application;

[0035] Figure 4 yes Figure 3 Another angle view of;

[0036] Figure 5 yes Figure 3 Schematic diagram of the medium shear mounting. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of this application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain this application, and should not be understood as limitations on this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of this application are described in detail below in conjunction with the drawings.

[0038] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as limiting the scope of protection of this application.

[0039] The following is combined with Figures 1 to 5 This application is described in further detail.

[0040] The present application provides a test piece for verifying the influence of assembly stress on life, including: a test piece and a mounting piece.

[0041] Both the test piece and the mounting piece have an area of ​​interest and a loading area; the area of ​​interest of the test piece and the area of ​​interest of the mounting piece are assembled by fasteners, and an assembly gap is provided at the assembly position; the loading area of ​​the test piece and the loading area of ​​the mounting piece are used to apply the load.

[0042] The test pieces for verifying the influence of assembly stress on life in the present application include tensile test pieces and shear test pieces based on different loads, and the mounting pieces include tensile mounting pieces and shear mounting pieces. The tensile test pieces are combined with tensile mounting pieces to verify the influence of assembly stress on life under tensile load; the shear test pieces are combined with shear mounting pieces to verify the influence of assembly stress on life under shear load.

[0043] In the preferred embodiment of this application, see Figures 1 to 2The tensile test piece includes a tensile test piece main body, the middle part of the tensile test piece main body is the focus area, the two ends are loading areas, a first vertical rib is provided on one side of the middle part of the tensile test piece main body, and mounting holes are provided on the tensile test piece main body and the first vertical rib; the tensile mounting piece includes a tensile mounting piece main body, the tensile mounting piece main body is adapted to the tensile test piece main body, the middle part is the focus area, the two ends are loading areas, a second vertical rib is provided on one side of the middle part of the tensile mounting piece main body, and mounting holes are provided on the tensile mounting piece main body and the second vertical rib, and the tensile mounting piece is connected to the tensile test piece by fasteners; wherein, the focus area of ​​the tensile mounting piece main body has a thickness difference with respect to other parts of the tensile mounting piece main body, so that after the tensile test piece and the tensile mounting piece are assembled, an assembly gap is formed between the focus area of ​​the tensile mounting piece main body and the focus area of ​​the tensile test piece main body.

[0044] In this embodiment, two first reinforcing ribs are provided between the main body of the tensile test piece and the first vertical rib. The area of ​​interest of the tensile mounting piece is connected to the area of ​​interest of the tensile test piece via bolts; the loading area of ​​the tensile mounting piece is connected to the loading area of ​​the tensile test piece via countersunk rivets. Advantageously, in this embodiment, the tensile mounting pieces come in a variety of different sizes. The area of ​​interest of the tensile mounting piece main body of each of these different sizes has a different thickness difference relative to the rest of the tensile mounting piece main body. The assembly gap between the tensile test piece and the tensile mounting piece can be adjusted by replacing the tensile mounting piece.

[0045] In the preferred embodiment of this application, see Figures 3 to 5 The shear test piece includes a shear test piece main body, the middle part of the shear test piece main body is the focus area, and first ears extend downward from both ends, the first ears serve as the loading area, and a mounting hole is provided on the shear test piece main body; the shear mounting piece includes a shear test piece main body, the shear test piece main body is adapted to the shear test piece main body, the middle part is the focus area, and a second ear extends upward from the middle part, the second ear serves as the loading area, and a mounting hole is provided on the shear test piece main body, and the shear mounting piece is connected to the shear test piece by fasteners; wherein, the focus area of ​​the shear mounting piece main body has a thickness difference relative to other parts of the shear mounting piece main body, so that after the shear test piece and the shear mounting piece are assembled, an assembly gap is formed between the focus area of ​​the shear mounting piece main body and the focus area of ​​the shear test piece main body.

[0046] In this embodiment, a second reinforcing rib is provided on the main body of the shear test piece. The region of interest of the shear mounting piece is connected to the region of interest of the shear test piece via bolts. Advantageously, the shear mounting piece comes in a variety of different sizes, and the region of interest of the shear mounting piece main body of each shear mounting piece has a different thickness difference relative to the rest of the shear mounting piece main body. The assembly gap between the shear test piece and the shear mounting piece can be adjusted by replacing the shear mounting piece.

[0047] The test piece in this application is used to verify the impact of assembly stress on life. It simulates the assembly stress generated during actual structural assembly by changing the gap between the test piece and the mounting part, tightening the bolts at the concerned parts during assembly, and applying loads (including tension and shear) at both ends.

[0048] The test piece for verifying the influence of assembly stress on life in this application determines the size parameters of the test piece and the mounting part in the areas of interest based on the actual structural dimensions. The loading area parameters of the test piece and the mounting part can be determined by the stiffness ratio with the test piece. During assembly, the test piece and the mounting part are assembled first. When assembling the test piece and the mounting part, the mounting part with a suitable gap value is selected according to the actual situation to control the assembly gap. The bolts are tightened to a certain tightening torque using a torque wrench, and this tightening torque is used as the basis for a series of measurements. When assembling the test piece and the mounting part, the bolts are passed through the mounting holes of the two. In order not to affect the test clamping, the loading areas of the tensile test piece and the tensile mounting part are installed with countersunk rivets.

[0049] The test piece of this application to verify the influence of assembly stress on life has designed two types of load-bearing test piece structures, one is tension and the other is shear. Through the cooperation of the test piece and the mounting part, the structure with gap installation is measured. When the bolts are tightened and subjected to external forces of tension or shear, the assembly stress generated by the structural parts affects the degree of life. This application can adjust the gap value between the test piece and the mounting part by replacing the mounting part according to actual needs. The mounting part can be designed with gap values ​​of different sizes according to the test conditions. After determining the gap between the mounting part and the test piece, loading is carried out in the loading area. Several sets of test pieces can be processed for the same test to avoid individuality due to the processing technology.

[0050] This application verifies the impact of assembly stress on lifespan in test specimens, primarily subject to tension and shear. By measuring assembly stress at key points, the assembly stress calculation method is refined to improve accuracy and determine the relationship between assembly stress and lifespan. This provides a basis for rationally controlling aircraft assembly clearances and reducing assembly stress. By measuring assembly stress at key points on the test specimens, the assembly stress calculation method is refined. Furthermore, numerical calculations of potential assembly stresses in actual structures are performed to assess the risk of structural failure.

[0051] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A test piece for verifying the effect of assembly stress on life, characterized in that: include: a test piece having a region of interest and a loading zone; a mounting member having a region of interest and a loading zone; in, The area of ​​interest of the test piece and the area of ​​interest of the mounting piece are assembled by fasteners, and an assembly gap is provided at the assembly position; The loading area of ​​the test piece and the loading area of ​​the mounting piece are used to implement load application; The test piece includes a tensile test piece, and the mounting piece includes a tensile mounting piece, wherein: The tensile test piece is used in conjunction with the tensile mounting piece to verify the effect of assembly stress on service life under tensile load; The tensile test piece includes a tensile test piece body, the middle portion of the tensile test piece body is a focus area, and both ends are loading areas. A first vertical rib is provided on one side of the middle portion of the tensile test piece body, and mounting holes are provided on the tensile test piece body and the first vertical rib. The tension mounting member includes a tension mounting member body, the tension mounting member body is adapted to the tension test member body, the middle portion is a focus area, and both ends are loading areas, a second vertical rib is provided on one side of the middle portion of the tension mounting member body, the tension mounting member body and the second vertical rib are both provided with mounting holes, and the tension mounting member and the tension test member are connected by fasteners; The area of ​​interest of the tension mounting member body has a thickness difference relative to other parts of the tension mounting member body, so that after the tension test piece is assembled with the tension mounting member, an assembly gap is formed between the area of ​​interest of the tension mounting member body and the area of ​​interest of the tension test piece body.

2. The test piece for verifying the influence of assembly stress on life according to claim 1, characterized in that: A first reinforcing rib is provided between the tensile test piece body and the first vertical rib.

3. The test piece for verifying the influence of assembly stress on life according to claim 2, characterized in that: The area of ​​interest of the tension mounting piece is connected to the area of ​​interest of the tension test piece by bolts; The loading area of ​​the tension mounting piece is connected to the loading area of ​​the tension test piece through countersunk rivets.

4. The test piece for verifying the influence of assembly stress on life according to claim 3, characterized in that: The tension mounting piece includes a variety of different specifications. The focus area of ​​the tension mounting piece body of the tension mounting piece of different specifications has a different thickness difference relative to other parts of the tension mounting piece body. The assembly gap value between the tension test piece and the tension mounting piece is adjusted by replacing the tension mounting piece.

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