Test device and test method for realizing uniform tensile loading of stiffened wall plate

Abstract

The invention provides a test device and a test method for realizing uniform tensile loading of a stiffened wallboard, the test device comprises a first clamp, a second clamp and a third clamp, the first clamp is located below a wallboard skin, the second clamp is located above the wallboard skin, the first clamp and the second clamp are in contact with the lower surface and the upper surface of the wallboard skin, and the third clamp is in contact with the lower surface and the upper surface of the wallboard skin. The wall plate skin is jointly clamped; the first clamp and the second clamp are simultaneously and directly connected with a testing machine; the second clamp is connected with the third clamp, and the third clamp is connected with the second clamp and the stiffened strip so that the load can be transmitted to the stiffened strip. The test method comprises the following steps: the support is provided with the stiffened wall plate; assembling the test device and the stiffened wall plate; the clamps and the stiffened wall plates are installed on a testing machine; and applying a load by the testing machine, and measuring the ultimate strength of the stiffened wallboard. According to the invention, the stiffened strip and the wallboard skin are directly connected with the testing machine through the clamp, so that the wallboard skin and the stiffened strip are uniformly loaded, overall uniform stretching is realized, and the stiffened wallboard is prevented from being broken at the root of the clamp firstly.

Description

Technical Field

[0001] The invention belongs to the technical field of structural mechanics strength testing, and in particular relates to a testing device and a testing method for realizing uniform tensile loading of a reinforced wall panel. Background Art

[0002] Lightweighting of aviation structures and materials is an inevitable trend in the development of the aerospace field. With the increasing requirements for aircraft performance, how to reduce the overall weight while maintaining structural strength and rigidity has become a major challenge facing design engineers. In this context, stiffened panels have become the most widely used structural form in aircraft wings and fuselage structures due to their advantages such as light weight, high strength and high bending rigidity. Stiffened panels can effectively carry and disperse the complex loads generated during flight, including tension, pressure and shear, by selecting materials reasonably and optimizing the cross-sectional shape, spacing and thickness of the ribs.

[0003] Conducting ultimate strength tests of stiffened panels under various load forms is a key step in the aircraft design process. Among them, the uniform stretching of stiffened panels during the tensile strength test is a key link in evaluating their performance. However, traditional stiffened panel tensile test devices often have design defects, which affect the accuracy of the test results.

[0004] Specifically, traditional test devices usually directly connect the skin to the loading device, while the stretching of the ribs depends on the connection method between the ribs and the skin (such as riveting and welding) to transmit force. This method can only produce local stretching on the reinforced wall panels during loading, causing the ribs to be affected by bending moment. This localized loading method is prone to stress concentration and uneven deformation, resulting in a gap between the test results and the actual performance of the material. This not only affects the actual performance of the material, but may also lead to inaccurate test data, which in turn misleads when designing and optimizing reinforced wall panels, increasing safety risks.

[0005] In aircraft design, these problems are particularly prominent when faced with high-performance materials. Modern aircraft increasingly use composite materials and high-strength alloys, which have significantly different response characteristics to tension and other forms of loads than traditional materials. Therefore, it is particularly urgent to develop a new type of tensile test device for stiffened panels that can achieve uniform tension. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of uneven stretching of reinforced wall panels in the prior art, and to provide a test device and a test method for achieving uniform tensile loading of reinforced wall panels. The reinforcing strips and the wall panel skin are directly connected to the testing machine through a clamp, so that the wall panel skin and the reinforcing strips are loaded evenly, thereby achieving overall uniform stretching of the reinforced wall panels, avoiding the reinforced wall panels from breaking first at the root of the clamp, thereby reducing stress concentration and uneven deformation of the reinforced wall panels during tensile strength tests, and improving the accuracy and reliability of the tensile strength tests.

[0007] To achieve the above purpose, the technical solution provided by the present invention is:

[0008] On the one hand, the present invention provides a test device for realizing uniform tensile loading of a stiffened wall panel, wherein the stiffened wall panel is clamped by the test device for tensile loading test, and the stiffened wall panel comprises a plurality of stiffening strips and a wall panel skin, and each of the stiffening strips is fixed on the surface of the wall panel skin; the test device comprises: a first clamp, a second clamp and a third clamp, wherein:

[0009] The first clamp is located below the panel skin, and the second clamp is located above the panel skin. The first clamp and the second clamp contact the lower surface and the upper surface of the panel skin respectively, and clamp the panel skin together. The first clamp and the second clamp are directly connected to a testing machine for tensile loading test at the same time, so as to realize the transmission of the load of the testing machine to the panel skin.

[0010] The second clamp is connected to the third clamp, and the third clamp connects the second clamp and the reinforcing bar to achieve load transfer to the reinforcing bar.

[0011] Based on one aspect, in a specific embodiment of the present invention, two test devices respectively clamp two ends of the stiffened wall panel, so that the stiffened wall panel is located between the test devices.

[0012] Based on one aspect, in a specific embodiment of the present invention, the reinforcement strip includes a rib web and a rib edge plate, the rib web and the rib edge plate are connected to form a right angle; the rib web is fixedly arranged on the upper surface of the wall panel skin;

[0013] The rib web and the rib edge of each of the stiffening bars are fixedly connected to the third clamp at the same time.

[0014] Based on one aspect, in a specific embodiment of the present invention, the third clamp includes a plurality of sub-clamps, and the number of the sub-clamps is the same as the number of the reinforcing strips;

[0015] One of the sub-clamps fixes the rib web and the rib flange of one of the stiffening bars.

[0016] Based on one aspect, in a specific embodiment of the present invention, the rib web causes grooves to be formed on the upper surface of the panel skin; the test device further includes a first reinforcement sheet and a second reinforcement sheet;

[0017] The first reinforcing sheet is located on the lower surface of the panel skin, and the second reinforcing sheet is located on the upper surface of the panel skin to fill the groove;

[0018] The contact lengths between the first reinforcement sheet, the second reinforcement sheet and the panel skin are all greater than the contact lengths between the first clamp, the second clamp and the third clamp and the panel skin, thereby ensuring uniform transmission of the load and avoiding stress concentration at the root of the clamp, which causes the rib web and rib edge plate to break first during the tensile loading test.

[0019] Based on one aspect, in a specific embodiment of the present invention, the structure of the first reinforcement sheet matches the lower surface structure of the panel skin;

[0020] The structure of the second reinforcement sheet matches the upper surface structure of the wall panel skin and the structure of the reinforcement strip.

[0021] Based on one aspect, in a specific embodiment of the present invention, the first clamp includes a first contact portion and a first connecting portion, the first contact portion is a region where the first clamp contacts the panel skin, and the structure of the first contact portion matches the structure of the panel skin;

[0022] The second clamp comprises a second contact portion and a second connecting portion, the second contact portion is a region where the second clamp contacts the panel skin and the reinforcing strip, and the structure of the second contact portion matches the structure of the panel skin and the structure of the reinforcing strip;

[0023] The third clamp is buckled on the second clamp, and the side surface of the third clamp and the second clamp jointly fix the reinforced wall panel.

[0024] Based on one aspect, in a specific embodiment of the present invention, the first connecting portion and the second connecting portion are respectively the areas where the first clamp and the second clamp are located outside the stiffened wall panel, and the widths of the first connecting portion and the second connecting portion are both smaller than the width of the stiffened wall panel;

[0025] The test device further includes a gasket, which is located between the first connecting portion and the second connecting portion, and the thickness of the gasket matches the wall panel skin and the sum of the thickness of the first reinforcement sheet and the second reinforcement sheet in the test device.

[0026] On the other hand, the present invention provides a test method for realizing uniform tensile loading of a stiffened wall panel. Based on the above-mentioned one aspect, a test device for realizing uniform tensile loading of a stiffened wall panel is provided. The test method comprises:

[0027] Step 1: Make a reinforced wall panel, rivet the reinforcing strips and the wall panel skin, and punch holes at the positions corresponding to the test device;

[0028] Step 2: Assemble the test device and the reinforced wall panel so that the first clamp, the second clamp, and the third clamp of the test device are tightly connected to the reinforced wall panel to generate sufficient friction force to achieve the stretching of the reinforced wall panel;

[0029] Step 3, installing each fixture and the reinforced wall panel on a testing machine, and the testing machine clamps the first fixture, the second fixture and the third fixture;

[0030] Step 4: The testing machine applies a load, observes the deformation state of the reinforced wall panel under the tensile load, and measures the ultimate strength of the reinforced wall panel.

[0031] Based on another aspect, in a specific embodiment of the present invention, the step 2 comprises:

[0032] Step 21, installing a first reinforcement sheet on the lower surface of the reinforced wall panel, and installing a second reinforcement sheet on the upper surface of the reinforced wall panel, so as to fill the grooves caused by the reinforcement strips;

[0033] Step 22, install a first clamp outside the first reinforcement sheet, install a second clamp outside the second reinforcement sheet, place a gasket in the gap between the first clamp and the second clamp, and allow one end of the first clamp and the second clamp to be directly connected to the wall panel skin, and the other end to be directly connected to the testing machine; in addition to being directly connected to the wall panel skin, the second clamp has a protrusion designed on it that is connected to the rib edge plate;

[0034] Step 23, the third clamp is buckled on the second clamp, the side of the third clamp and the second clamp lock the rib edge plate, the third clamp is connected to the rib edge plate and the second clamp at the same time, so that the load is transferred from the second clamp to the third clamp, and then to the reinforcing bar.

[0035] The advantages of the present invention are:

[0036] 1. The present invention connects the reinforcing strips and the wall panel skin directly to the testing machine through a clamp, so that the wall panel skin and the reinforcing strips are loaded evenly, achieving overall uniform stretching of the reinforced wall panel, avoiding the reinforced wall panel from breaking first at the root of the clamp, thereby reducing stress concentration and uneven deformation of the reinforced wall panel during the tensile strength test, and improving the accuracy and reliability of the tensile strength test.

[0037] 2. In the present invention, the first reinforcement sheet and the second reinforcement sheet are respectively in contact with the stiffened wall panel by a length L 1 Longer than the length L of the first clamp and the second clamp in contact with the stiffened wall panel respectively 2 , ensuring that the force transmission during the test is more uniform, without causing stress concentration at the roots of the first clamp and the second clamp, and avoiding the reinforced wall panels at the roots of the first clamp and the second clamp from breaking first.

[0038] 3. In the present invention, a gasket is arranged between the first clamp and the second clamp to fill the gap, so as to prevent the first clamp and the second clamp from bending due to the clamping force of the testing machine.

[0039] 4. The present invention directly transmits the load to the wall panel skin through the first clamp and the second clamp, and transmits the load to the reinforcing strip through the connection between the third clamp and the second clamp, thereby achieving uniform stretching during the tensile test of the reinforced wall panel.

[0040] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0042] Figure 1 : A three-dimensional structural schematic diagram of a test device for realizing uniform tensile loading of a reinforced wall panel provided by the present invention;

[0043] Figure 2 : A schematic structural diagram from a first perspective of a test device for achieving uniform tensile loading of a stiffened wall panel provided by the present invention;

[0044] Figure 3 : A second perspective structural schematic diagram of a test device for realizing uniform tensile loading of a reinforced wall panel provided by the present invention;

[0045] Figure 4 :The present invention provides Figure 3 A partial enlarged view of part A;

[0046] Figure 5 : An exploded view of a test device for realizing uniform tensile loading of a stiffened wall panel provided by the present invention;

[0047] Figure 6 : A three-dimensional diagram of the reinforced wall panel provided by the present invention;

[0048] Figure 7 : A three-dimensional diagram of the first clamp, the second clamp and the third clamp provided by the present invention cooperating with each other;

[0049] Figure 8 : A three-dimensional diagram of a first clamp provided by the present invention;

[0050] Fig. 9 : A three-dimensional diagram of a second clamp provided by the present invention;

[0051] Fig.10 : A three-dimensional diagram of a third clamp provided by the present invention;

[0052] Fig.11 : A flow chart of a test method for realizing uniform tensile loading of a reinforced wall panel provided by the present invention;

[0053] In the figure: 100-test device; 110-first clamp; 111-first contact portion; 112-first connecting portion; 120-second clamp; 121-protrusion; 122-second contact portion; 123-second connecting portion; 130-third clamp; 131-sub-clamp; 140-first reinforcement plate; 150-second reinforcement plate; 160-gasket; 200-reinforced wall panel; 210-reinforcement strip; 220-wall panel skin. DETAILED DESCRIPTION

[0054] The embodiments of the present invention are described in detail below. The embodiments are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention. In order to make the objects, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, and the technical solutions in the embodiments will be clearly and completely explained. The same or similar reference numerals shown in the accompanying drawings represent the same or functionally similar elements. It should be particularly pointed out that the embodiments described below are exemplary and are only used to illustrate the present invention and should not be regarded as limiting it.

[0055] In the description of the present invention, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like are used, these positions or positional relationships are based on the positions in the drawings or the conventional placement of the product when it is used, and are intended to facilitate the description and simplified explanation of the present invention, rather than to limit the device or component to a specific position in actual operation. Therefore, these terms should not be understood as constraints on the present invention. In addition, terms such as "first", "second", etc. are only used to distinguish different components and do not represent their relative importance.

[0056] It is further explained that the terms "horizontal", "vertical" and the like mentioned in the description of the present invention do not require that the components are absolutely horizontal or vertical, but allow a certain degree of inclination. For example, "horizontal" only means more horizontal relative to the direction of "vertical", and does not mean that the structure must be completely horizontal, and a certain degree of inclination is allowed.

[0057] In addition, the terms "set", "install", "connect" or "connect" mentioned in the description of the present invention should be understood in a broad sense. They can refer to fixed connection, detachable connection or integrated connection; can refer to mechanical connection or electrical connection; can be directly connected, can be indirectly connected through an intermediate medium, or even the internal connection of two components. For ordinary technicians in this field, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0058] The embodiment of the present invention provides a test device for achieving uniform tensile loading of a reinforced wall panel. The reinforced wall panel is clamped using the test device for a tensile loading test, which can achieve uniform tensile loading of the reinforced wall panel, thereby reducing stress concentration and uneven deformation, and improving the accuracy and reliability of the tensile test. Specifically:

[0059] See also Figure 6 The reinforced wall panel 200 of the embodiment of the present invention includes a plurality of reinforcing strips 210 and a wall panel skin 220, each reinforcing strip 210 is fixed on the surface of the wall panel skin 220, the reinforcing strip 210 includes a reinforcing web and a reinforcing edge, the reinforcing web and the reinforcing edge are connected at a right angle; the reinforcing web is fixed on the upper surface of the wall panel skin 220; the reinforcing web causes grooves to be formed on the upper surface of the wall panel skin 220.

[0060] In the embodiment of the present invention, two test devices 100 are required to be used in the tensile loading test of the stiffened wall panel 200. The two test devices 100 clamp the two ends of the stiffened wall panel 200 respectively, so that the stiffened wall panel 200 is located between the test devices 100. Figure 1 , Figure 2 , Figure 3 and Figure 4 Each test device 100 of the embodiment of the present invention includes: a first clamp 110, a second clamp 120, a third clamp 130, a first reinforcement sheet 140, a second reinforcement sheet 150 and a gasket 160, wherein: the first clamp 110 is located below the wall panel skin 220, the second clamp 120 is located above the wall panel skin 220, the first clamp 110 and the second clamp 120 contact the lower surface and the upper surface of the wall panel skin 220 respectively, and clamp the wall panel skin 220 together; the first clamp 110 and the second clamp 120 are directly connected to the testing machine for tensile loading test at the same time, so as to realize the load transfer of the testing machine to the wall panel skin 220; the second clamp 120 is connected to the third clamp 130, and the third clamp 130 is connected to the second clamp 120 and the reinforcing strip 210, so as to realize the load transfer to the reinforcing strip 210. The rib web and rib flange of each reinforcing bar 210 are fixedly connected to the third clamp 130 at the same time.

[0061] Please continue reading Figure 6Preferably, there are three reinforcing bars 210 in the embodiment of the present invention. The three reinforcing bars 210 are riveted with the wall panel skin 220 to form an I-type 3-rib reinforced wall panel. The test device 100 performs a uniform tensile loading strength test on the I-type 3-rib reinforced wall panel. The spacing between the I-type ribs in the I-type 3-rib reinforced wall panel is 80mm, the thickness of the wall panel skin 220 is 2mm, and the width is 240mm. The reinforcing bars 210 in the embodiment of the present invention are consistent in length with the wall panel skin 220, and the reinforcing bars 210 and the wall panel skin 220 are fixed by riveting. The test device 100 applies an external tensile force parallel to the reinforcing bars 210 to the reinforced wall panel 200. Under the test load of the external tensile force, the test data is obtained by measuring and processing the tensile ultimate strength, and the failure process, strength and mechanical parameters of the reinforced wall panel 200 under the tensile load are analyzed.

[0062] Please continue reading Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The two test devices 100 respectively include a gasket 160, a first reinforcing sheet 140, a second reinforcing sheet 150, a first clamp 110, a second clamp 120 and a third clamp 130. One end of the first clamp 110 and the second clamp 120 are directly connected to the panel skin 220 and the reinforcing strip 210 of the stiffened panel 200, and the other end of the first clamp 110 and the second clamp 120 are directly connected to the testing machine, so that the stiffened panel 200 is subjected to a uniform tensile load. Preferably, the first clamp 110 and the second clamp 120 are respectively installed on the upper and lower sides of the stiffened panel 200, and the first clamp 110 and the second clamp 120, the second clamp 120 and the third clamp 130, and each clamp and the stiffened panel 200 are tightly connected by bolts.

[0063] See also Figure 7 and Fig.10 The third clamp 130 of the embodiment of the present invention includes a plurality of sub-clamps 131, and the number of the sub-clamps 131 is the same as the number of the reinforcing bars 210; one sub-clamp 131 fixes the rib web and rib edge of one reinforcing bar 210. In order to facilitate the detachable connection of each sub-clamp 131 with the second clamp 120 and the reinforced wall panel 200, the embodiment of the present invention detachably connects them. Specifically: the connecting bolts between the sub-clamp 131 and the reinforced wall panel 200 of the embodiment of the present invention are cross-staggered bolts, and the bolt holes between the sub-clamp 131 and the reinforced wall panel 200 are blind holes. The gasket 160 of the embodiment of the present invention is located in the gap between the first clamp 110 and the second clamp 120 to prevent the gap between the first clamp 110 and the second clamp 120 from causing the clamp to warp.

[0064] Please continue reading Figure 1 , Figure 2 and Figure 3The two loading devices at the two ends of the stiffened wall panel 200 of the embodiment of the present invention can be mirrored along the mid-surface of the stiffened wall panel 200 in the loading direction.

[0065] Please continue reading Figure 3 , Figure 4 and Figure 5 In the embodiment of the present invention, the rib web causes grooves to form on the upper surface of the wall panel skin 220, the first reinforcing sheet 140 is located on the lower surface of the wall panel skin 220, and the second reinforcing sheet 150 is located on the upper surface of the wall panel skin 220 to fill the grooves; the contact lengths of the first reinforcing sheet 140, the second reinforcing sheet 150 and the wall panel skin 220 are all greater than the contact lengths of the first clamp 110, the second clamp 120 and the third clamp 130 and the wall panel skin 220, thereby ensuring uniform transmission of the load and avoiding stress concentration at the root of the clamp, which causes the rib web and the rib edge plate to break first during the tensile loading test.

[0066] In addition to being directly connected to the panel skin 220, the second clamp 120 of the embodiment of the present invention is also connected to the protrusion 121 corresponding to the reinforcing strip 210 by the reinforcing strip 210, and the bolt hole on the protrusion 121 is set as an elliptical hole, so that the second clamp 120 and the third clamp 130 can be automatically adjusted during installation. The third clamp 130 of the embodiment of the present invention is buckled on the second clamp 120, and the side of the third clamp 130 and the second clamp 120 lock the reinforced wall panel 200. Two types of connections are set on it, one type of connection is the connection between the third clamp 130 and the reinforced wall panel 200, and the other type is the connection between the third clamp 130 and the second clamp 120, so that the load is transferred from the second clamp 120 to the third clamp 130, and then to the reinforcing strip 210. In order to avoid the connection bolts of the third clamp 130, the reinforcing strip 210 and the wall panel skin 220 from crossing, the bolts of the reinforced wall panel 200 and the clamp are arranged in a staggered manner, and the bolt holes on the third clamp 130 connected to the reinforced wall panel 200 are designed as blind holes.

[0067] Please continue reading Figure 5 In the embodiment of the present invention, the structure of the first reinforcing sheet 140 matches the lower surface structure of the wall panel skin 220; the structure of the second reinforcing sheet 150 matches the upper surface structure of the wall panel skin 220 and the structure of the reinforcing strip 210. Figure 8The first clamp 110 of the embodiment of the present invention includes a first contact portion 111 and a first connecting portion 112, the first contact portion 111 is the area where the first clamp 110 contacts the wall panel skin 220, and the structure of the first contact portion 111 matches the structure of the wall panel skin 220; the second clamp 120 includes a second contact portion 122 and a second connecting portion 123, the second contact portion 122 is the area where the second clamp 120 contacts the wall panel skin 220 and the reinforcing strip 210, and the structure of the second contact portion 122 matches the structure of the wall panel skin 220 and the structure of the reinforcing strip 210; the third clamp 130 is buckled on the second clamp 120, and the side of the third clamp 130 and the second clamp 120 jointly fix the reinforced wall panel 200.

[0068] See also Figures 1 to 4 The first clamp 110 and the second clamp 120 of the embodiment of the present invention are respectively installed on the upper surface and the lower surface of the reinforced wall panel 200, and the first clamp 110 and the second clamp 120 as well as each clamp and the reinforced wall panel 200 are tightly connected by bolts.

[0069] See also Figure 6 , Figure 8 and Fig. 9 The first connection portion 112 and the second connection portion 123 of the embodiment of the present invention are respectively the areas where the first clamp 110 and the second clamp 120 are located outside the stiffened wall panel 200, and the widths of the first connection portion 112 and the second connection portion 123 are both smaller than the width of the stiffened wall panel 200; please continue to refer to Figure 6 The test device 100 of the embodiment of the present invention further includes a gasket 160, which is located between the first connecting portion 112 and the second connecting portion 123. The thickness of the gasket 160 matches the sum of the thickness of the wall panel skin 220 and the first reinforcement sheet 140 and the second reinforcement sheet 150 in the test device 100.

[0070] See also Fig.11 The embodiment of the present invention provides a test method for realizing uniform tensile loading of a stiffened wall panel. Based on the above-mentioned test device for realizing uniform tensile loading of a stiffened wall panel, please refer to Fig.11 , the test method of the embodiment of the present invention includes:

[0071] Step 1: Make a reinforced wall panel, rivet the reinforcing strips and the wall panel skin, and drill holes at the corresponding positions of the reinforced wall panel and the test device.

[0072] Step 2, assemble the test device and the reinforced wall panel so that the first clamp, the second clamp and the third clamp of the test device are tightly connected with the reinforced wall panel, and generate sufficient friction to achieve the stretching of the reinforced wall panel; Step 2 of the embodiment of the present invention includes: Step 21, install the first reinforcement sheet on the lower surface of the reinforced wall panel, and install the second reinforcement sheet on the upper surface of the reinforced wall panel to fill the grooves caused by the existence of the reinforcement strip; Step 22, install the first clamp outside the first reinforcement sheet, install the second clamp outside the second reinforcement sheet, place a gasket in the gap between the first clamp and the second clamp, so that one end of the first clamp and the second clamp is directly connected to the wall panel skin, and the other end is directly connected to the testing machine; in addition to being directly connected to the wall panel skin, the second clamp is designed with a protrusion connected to the rib edge plate; Step 23, the third clamp is buckled on the second clamp, the side of the third clamp and the second clamp lock the rib edge plate, and the third clamp is connected to the rib edge plate and the second clamp at the same time, so that the load is transferred from the second clamp to the third clamp, and then to the reinforcement strip.

[0073] Step 3: Install each fixture and the reinforced wall panel on the testing machine, and the testing machine clamps the first fixture, the second fixture and the third fixture.

[0074] Step 4: The testing machine applies load, observes the deformation state of the reinforced wall panel under the tensile load, and measures the ultimate strength of the reinforced wall panel.

[0075] In the embodiment of the present invention, the reinforcing strips and the wall panel skin are directly connected to the testing machine through a clamp, so that the wall panel skin and the reinforcing strips are evenly loaded, and the overall uniform stretching of the reinforced wall panel is achieved, and the reinforced wall panel is prevented from first breaking at the root of the clamp, thereby reducing the stress concentration and uneven deformation of the reinforced wall panel during the tensile strength test, and improving the accuracy and reliability of the tensile strength test. In the embodiment of the present invention, the load is directly transferred to the wall panel skin through the first clamp and the second clamp, and the load is transferred to the reinforcing strips through the connection between the third clamp and the second clamp, thereby achieving uniform stretching during the tensile test of the reinforced wall panel.

[0076] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be included in the protection scope of the present invention.

Claims

1. A test device for achieving uniform tensile loading of a stiffened wall panel, characterized in that: The stiffened wall panel is clamped by the test device for tensile loading test, and the stiffened wall panel comprises a plurality of stiffening strips and a wall panel skin, and each of the stiffening strips is fixed on the surface of the wall panel skin; the test device comprises: a first clamp, a second clamp and a third clamp, wherein: The first clamp is located below the panel skin, and the second clamp is located above the panel skin. The first clamp and the second clamp contact the lower surface and the upper surface of the panel skin respectively, and clamp the panel skin together. The first clamp and the second clamp are directly connected to a testing machine for tensile loading test at the same time, so as to realize the transmission of the load of the testing machine to the panel skin. The second clamp is connected to the third clamp, and the third clamp connects the second clamp and the reinforcing bar to achieve load transfer to the reinforcing bar.

2. A test device for achieving uniform tensile loading of a stiffened wall panel according to claim 1, characterized in that: The two test devices respectively clamp the two ends of the stiffened wall panel so that the stiffened wall panel is located between the test devices.

3. A test device for achieving uniform tensile loading of a stiffened wall panel according to claim 1, characterized in that: The reinforcement strip includes a rib web and a rib edge plate, wherein the rib web and the rib edge plate are connected at a right angle; the rib web is fixedly arranged on the upper surface of the wall panel skin; The rib web and the rib edge of each of the stiffening bars are fixedly connected to the third clamp at the same time.

4. A test device for achieving uniform tensile loading of a stiffened wall panel according to claim 3, characterized in that: The third clamp includes a plurality of sub-clamps, and the number of the sub-clamps is the same as the number of the reinforcing strips; One of the sub-clamps fixes the rib web and the rib flange of one of the stiffening bars.

5. A test device for achieving uniform tensile loading of a stiffened wall panel according to claim 3, characterized in that: The rib web causes grooves to be formed on the upper surface of the panel skin; the test device also includes a first reinforcement sheet and a second reinforcement sheet; The first reinforcing sheet is located on the lower surface of the panel skin, and the second reinforcing sheet is located on the upper surface of the panel skin to fill the groove; The contact lengths between the first reinforcing sheet, the second reinforcing sheet and the wall panel skin are all greater than the contact lengths between the first clamp, the second clamp and the third clamp and the wall panel skin.

6. A test device for achieving uniform tensile loading of a stiffened wall panel according to claim 1, characterized in that: The structure of the first reinforcement sheet matches the lower surface structure of the panel skin; The structure of the second reinforcement sheet matches the upper surface structure of the wall panel skin and the structure of the reinforcement strip.

7. A test device for achieving uniform tensile loading of a stiffened wall panel according to claim 1, characterized in that: The first clamp comprises a first contact portion and a first connecting portion, the first contact portion is the area where the first clamp contacts the panel skin, and the structure of the first contact portion matches the structure of the panel skin; The second clamp comprises a second contact portion and a second connecting portion, the second contact portion is a region where the second clamp contacts the panel skin and the reinforcing strip, and the structure of the second contact portion matches the structure of the panel skin and the structure of the reinforcing strip; The third clamp is buckled on the second clamp, and the side surface of the third clamp and the second clamp jointly fix the reinforced wall panel.

8. A test device for achieving uniform tensile loading of a reinforced wall panel according to claim 7, characterized in that: The first connection portion and the second connection portion are respectively the areas where the first clamp and the second clamp are located outside the stiffened wall panel, and the widths of the first connection portion and the second connection portion are both smaller than the width of the stiffened wall panel; The test device further includes a gasket, which is located between the first connecting portion and the second connecting portion, and the thickness of the gasket matches the wall panel skin and the sum of the thickness of the first reinforcement sheet and the second reinforcement sheet in the test device.

9. A test method for achieving uniform tensile loading of a stiffened wall panel, characterized in that: A test device for realizing uniform tensile loading of a stiffened wall panel according to any one of claims 1 to 8, wherein the test method comprises: Step 1: Make a reinforced wall panel, rivet the reinforcing strips and the wall panel skin, and punch holes at the positions corresponding to the test device; Step 2: Assemble the test device and the reinforced wall panel so that the first clamp, the second clamp, and the third clamp of the test device are tightly connected to the reinforced wall panel to generate sufficient friction force to achieve the stretching of the reinforced wall panel; Step 3, installing each fixture and the reinforced wall panel on a testing machine, and the testing machine clamps the first fixture, the second fixture and the third fixture; Step 4: The testing machine applies a load, observes the deformation state of the reinforced wall panel under the tensile load, and measures the ultimate strength of the reinforced wall panel.

10. A test method for achieving uniform tensile loading of a stiffened wall panel according to claim 9, characterized in that: The second step comprises: Step 21, installing a first reinforcement sheet on the lower surface of the reinforced wall panel, and installing a second reinforcement sheet on the upper surface of the reinforced wall panel, so as to fill the grooves caused by the reinforcement strips; Step 22, install a first clamp outside the first reinforcement sheet, install a second clamp outside the second reinforcement sheet, place a gasket in the gap between the first clamp and the second clamp, and allow one end of the first clamp and the second clamp to be directly connected to the wall panel skin, and the other end to be directly connected to the testing machine; in addition to being directly connected to the wall panel skin, the second clamp has a protrusion designed on it that is connected to the rib edge plate; Step 23, the third clamp is buckled on the second clamp, the side of the third clamp and the second clamp lock the rib edge plate, the third clamp is connected to the rib edge plate and the second clamp at the same time, so that the load is transferred from the second clamp to the third clamp, and then to the reinforcing bar.

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