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Cross riveting plate surface tensile fatigue test device

A technology for fatigue testing and sheet materials, which is applied in the direction of measuring devices, analyzing materials, and testing the strength of materials by applying stable tension/pressure to achieve the effect of improving efficiency and convenience

Pending Publication Date: 2022-04-08
SHANGHAI RES INST OF MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the current situation that it is difficult to carry out surface tension fatigue test on cross riveted plates in the prior art, the present invention provides a surface tension fatigue test device for cross riveted plates
[0006] The cross-riveted plate surface tensile fatigue test device provided by the present invention can overcome the defects that cannot be measured in the prior art, and the cross-riveted plate surface tensile fatigue test device provided by the present invention itself has good buckling resistance and fatigue resistance

Method used

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  • Cross riveting plate surface tensile fatigue test device
  • Cross riveting plate surface tensile fatigue test device
  • Cross riveting plate surface tensile fatigue test device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0040] refer to figure 1 , figure 2 , the present embodiment provides a cross-riveted plate surface tensile fatigue test device, which is used to realize the surface tensile fatigue test device of the cross-riveted plate 9 to be tested. The cross-riveted plate surface tensile fatigue test device includes an upper platen 11, Lower pressing plate 12, bearing balance pad 6, X-axis pressing block 7 and Y-axis pressing block 8,

[0041] The upper platen 11 and the Y-axis pressure block 8 are located above and below one of the plates of the cross riveted plates 9 to be measured, and the upper platen 11, one of the plates of the cross riveted plates 9 to be measured and the Y-axis pressure block 8 are connected by bolts and nuts;

[0042] The lower pressing plate 12 and the X-axis pressing block 7 are located above and below the other plate of the cross riveted plate 9 to be tested, and the load balancing pad 6 is located between the lower pressing plate 12 and the other plate of t...

Embodiment 2

[0051] Using the device of Example 1, carry out cross-riveted plate surface tensile fatigue test, the thickness of the plate is 1.2mm×1.1mm, the maximum load after cross riveting is 3.53kN, and the selected load of surface tensile fatigue test is: 2.12kN, respectively. 1.76kN, 1.41kN, 1.23kN, 1.06kN, the test frequency is 25Hz, the loading waveform is sine wave, the loading technical requirements are as follows image 3 As shown, the stress ratio R is 0.1, and the test termination condition is: the specimen breaks or bears 1×10 7 Cycle times are not broken.

[0052] See Table 1 for test data.

[0053] Table 1 Tensile fatigue test data of cross riveted thin plate

[0054]

[0055]

[0056] S-N curve see image 3 (The fitting model is: y=A+B*x+C*x 2 , the fitting results this time are: A=12.3, standard error=3.4; B=-3.2, standard error=1.3; C=0.2, standard error=0.1. Correlation coefficient R 2 is 0.94).

[0057] It can be seen that this example successfully obtaine...

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Abstract

The invention relates to a cross-shaped riveting plate surface tensile fatigue test device, which is used for realizing the surface tensile fatigue test of a cross-shaped riveting plate to be tested, and comprises an upper pressing plate, a lower pressing plate, a bearing balance cushion block, an X-axis pressing block and a Y-axis pressing block, the upper pressing plate and the Y-axis pressing block are located above and below one of the to-be-tested cross-shaped riveting plates, and the upper pressing plate, one of the to-be-tested cross-shaped riveting plates and the Y-axis pressing block are connected through bolts and nuts; the lower pressing plate and the X-axis pressing block are located above and below the other plate of the to-be-tested cross-shaped riveted plates, the bearing balance cushion block is located between the lower pressing plate and the other plate of the to-be-tested cross-shaped riveted plates, and the lower pressing plate, the bearing balance cushion block, the other plate of the to-be-tested cross-shaped riveted plates and the X-axis pressing block are connected through bolts and nuts; the upper pressing plate and the lower pressing plate are respectively provided with a connecting piece used for being connected to a fatigue testing machine. The device provided by the invention can realize the surface tensile fatigue test of the cross-riveted thin plate.

Description

technical field [0001] The invention relates to a device for surface tension fatigue test, in particular to a surface tension fatigue test device for cross riveted plates. Background technique [0002] Non-ferrous metals, such as aluminum and its alloys, have strong chemical activity, and the surface is very easy to form a refractory oxide film (Al 2 o 3 The melting point is about 2050°C, and the melting point of MgO is about 2500°C), and aluminum and its alloys have strong thermal conductivity, so it is easy to cause non-fusion during welding. Since the density of the oxide film is close to that of aluminum, it is also easy to become an inclusion of the weld metal. Therefore, non-ferrous metals are usually connected by riveting, but the fatigue performance of the connection is rarely studied in the industry. Especially in the bearing direction perpendicular to the surface of the plate, the testing machine cannot directly apply the tensile load perpendicular to the surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/02G01N3/04
Inventor 郑程卢奇李凯孟莉
Owner SHANGHAI RES INST OF MATERIALS CO LTD