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Anti-warping device

An anti-warping and anti-warping technology, used in measuring devices, instruments, scientific instruments, etc., can solve problems such as failure of test data, and achieve the effects of simple device structure, good practical application value, and convenient disassembly.

Inactive Publication Date: 2016-06-08
CHINA AIRPLANT STRENGTH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of these devices can effectively restrain the sample from warping without changing the stress distribution of the sample, and it does not affect the crack observation during the test.
These anti-warping devices often lead to invalid test data

Method used

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Experimental program
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Embodiment Construction

[0025] Below by specific embodiment this patent is described in further detail:

[0026] See Figure 1 and figure 2 , which are the loading structure diagram of the K-R curve test of the thin plate measured by the compact tensile sample of the patented device, and the assembly diagram of the patented device and the sample. The patented device comprises a rectangular anti-sway plate 3, a step washer 5, a connecting bolt 6, a horizontal backing plate 7, a vertical backing plate 8 and a device buckle rope 9. The characteristics of each part of the device are as follows:

[0027] The rectangular anti-sway plate 3 is the main component of this patent, and there are two pieces in total, and the structural form is shown in Figure 4. The rectangular anti-warping plate 3 is two flat plates with the same shape machined from the steel plate, the thickness is about 5 times the thickness of the sample, and the surface is smooth and flat. The upper connection hole and the lower positioni...

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Abstract

The invention provides an anti-warping device of compact tension samples. The anti-warping device can be used for preventing warping deformation of samples in detecting of thin plate material K-R curve without changing stress distribution situations of the samples or influencing crack observation in tests. The anti-warping device comprises rectangular anti-warping plates 3, stepped gaskets 5, connecting bolts 6, horizontal backing plates 7, a vertical backing plate 8, and a device button rope 9; wherein the rectangular anti-warping plates 3 are two steel plates with identical shapes, the two horizontal backing plates 7 and the vertical backing plate 8 are steel plates with a thickness of 0.2 to 0.3mm thicker than that of the samples.

Description

technical field [0001] The invention belongs to the material performance testing technology, and relates to a warping prevention device for measuring the K-R curve of a thin plate material with a compact tensile sample. Background technique [0002] The K-R curve characterizes the resistance to fracture of a material in the slow and steady expansion of cracks in a plane stress state, and is often called the crack growth resistance curve. K-R curve is a necessary parameter for damage tolerance analysis of aircraft structure. Since the K-R curve is related to the thickness of the sample, and the fuselage and wing of the aircraft structure are mainly thin-walled and reinforced structures, it is often necessary to determine the K-R curve of the metal sheet. [0003] When the K-R curve test is performed with a thin plate, because the sample is locally in the compressive stress field, it will produce warping deformation, which will affect the validity of the test data. At presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/02
Inventor 张海英刘秀丽董登科焦婷
Owner CHINA AIRPLANT STRENGTH RES INST
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