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Testing method for residual stress in aluminum alloy pre-stretched plate

A technology of internal residual stress and pre-stretched plates, applied in the direction of force/torque/work measuring instruments, measuring devices, special data processing applications, etc., can solve problems such as complex calculations and inability to realize finite element calculation strains, and achieve improved testing The effect of precision

Active Publication Date: 2018-09-14
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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Problems solved by technology

However, this processing method cannot realize the one-to-one correspondence between the strain calculated by the finite element and the measured strain, and it needs to compare and select the order of the interpolation polynomial, which has the disadvantage of complicated calculation

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  • Testing method for residual stress in aluminum alloy pre-stretched plate
  • Testing method for residual stress in aluminum alloy pre-stretched plate
  • Testing method for residual stress in aluminum alloy pre-stretched plate

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Embodiment Construction

[0047] The technical scheme of the test method for the internal residual stress of the aluminum alloy pre-stretched plate provided by the present invention will be further explained in detail below in conjunction with the accompanying drawings.

[0048] figure 1 , 2 The preparation of the test piece and the arrangement of the strain gauges in a specific embodiment of the method provided by the present invention are shown. A certain length of pre-stretched plate is taken as a test piece. The length of the test piece is 2 to 2.5 times the thickness of the plate. The length direction of the test piece is parallel to the direction of the stress component to be measured. The surface formed by the length direction and the width direction of the specimen is marked as the front side 1, and the side opposite the front side 1 is marked as the back side 2. A plane formed by the length direction and the thickness direction of the test piece is the first reference plane 3 . A plane form...

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Abstract

The invention provides a testing method for residual stress in an aluminum alloy pre-stretched plate. Residual stress distribution in aluminum alloy sheets applied in the field of aerospace manufacturing can be precisely tested; compared with an existing crack compliance method, strain of finite element simulation can be identical to measured strain. Compared with the prior art, the method has themultiple advantages that the testing precision is significantly improved.

Description

technical field [0001] The invention relates to the field of stress testing of aluminum alloy materials, in particular to a testing technology for internal residual stress of aluminum alloy pre-stretched plates. Background technique [0002] In modern aviation manufacturing, the use of large aerospace thin-walled structural parts directly processed from large blanks such as aluminum alloy materials is more and more widely used, but due to the uneven distribution of Residual stress, as the blank material is removed during processing, the internal residual stress is continuously released and reaches a new balance, which easily deforms the workpiece. The processing deformation of structural parts will have a considerable negative impact on the service performance of parts and the subsequent assembly of parts, and the resulting rework or even scrapping of parts will lead to huge economic losses. Therefore, it is necessary to conduct precise tests on the internal residual stress...

Claims

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Application Information

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IPC IPC(8): G06F17/50G01L5/00
CPCG01L5/0047G06F2119/06G06F30/23
Inventor 马原冯平法付帅磊许超郁鼎文
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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