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A preparation method of a test block for residual stress detection of aluminum alloy pre-stretched plate

A technology of pre-stretching plate and residual stress, which is applied in the direction of measuring device, using sound wave/ultrasonic wave/infrasonic wave to analyze solids, and using sound wave/ultrasonic wave/infrasonic wave to analyze materials, etc. It can solve the problems of complex equipment, complicated calibration procedures, and dependence , to achieve the effect of fast detection speed, good economy and large measurement depth

Active Publication Date: 2016-03-30
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since ultrasonic measurement of residual stress is mainly based on the measurement of ultrasonic propagation velocity, the difference in ultrasonic propagation velocity in different materials is much greater than the velocity change caused by residual stress in the material
Therefore, before measuring the stress in a certain material, it is necessary to use the corresponding test block for measurement calibration, so that the current ultrasonic residual stress measurement method has two problems: the calibration procedure is complicated and the stress cannot be stored for a long time
On the one hand, the existing ultrasonic measurement stress calibration needs to use a tensile testing machine to apply a certain load to the sample, and it is necessary to prepare a special tensile sample, and to ensure that the temperature when the tensile load is applied is the same as the measurement temperature, so that the tensile The stretching process is more complicated, and it depends on the tensile testing machine, and the required equipment is complex
On the other hand, the stress loaded during stretching disappears due to the rebound of the sample after unloading, and the stress in the sample cannot be preserved for a long time, which also brings great inconvenience to the measurement of residual stress

Method used

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  • A preparation method of a test block for residual stress detection of aluminum alloy pre-stretched plate
  • A preparation method of a test block for residual stress detection of aluminum alloy pre-stretched plate
  • A preparation method of a test block for residual stress detection of aluminum alloy pre-stretched plate

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Effect test

Embodiment 1

[0027] The aluminum alloy pre-stretched plate of the brand 7050-T7451 has a longitudinal wave sound velocity of 3200m / s, a length of 500mm, a width of 450mm, and a thickness of 160mm. It is required to detect the residual stress within 2mm near the surface. The detection steps are as follows:

[0028] ⑴Make reference test block

[0029] 1.1 Cut the sample

[0030] Cut a length of 100mm on the product of the same batch of pre-stretched plate 13 to be tested, a rectangular sample with a width of 90mm and a thickness of 20mm, one of the largest surfaces of the rectangular sample is the rolling surface of the pre-stretched plate, the largest surface Call the sample rolling surface 5, the length of the rectangular sample is the same as the rolling direction of the pre-stretched plate, use the drilling method to measure the residual stress of the sample rolling surface 1, the number of measuring points is four, and its position 10mm away from the long side and 15mm away from the w...

Embodiment 2

[0050] The aluminum alloy pre-stretched plate of the brand 7050-T7451 has a longitudinal wave sound velocity of 3200m / s, a length of 600mm, a width of 400mm, and a thickness of 140mm. It is required to detect the residual stress within 4mm near the surface. The detection steps are as follows:

[0051] ⑴Make reference test block

[0052] 1.1 Cut the sample

[0053] Cut a length of 100mm on the product of the same batch of pre-stretched plate 13 to be tested, a rectangular sample with a width of 90mm and a thickness of 20mm, one of the largest surfaces of the rectangular sample is the rolling surface of the pre-stretched plate, the largest surface Call the sample rolling surface 5, the length of the rectangular sample is the same as the rolling direction of the pre-stretched plate, use the drilling method to measure the residual stress of the sample rolling surface 1, the number of measuring points is four, and its position 10mm away from the long side and 15mm away from the w...

Embodiment 3

[0073] The aluminum alloy pre-stretched plate of the brand 7050-T7451 has a longitudinal wave sound velocity of 3200m / s, a length of 600mm, a width of 500mm, and a thickness of 80mm. It is required to detect the residual stress within 8mm near the surface. The detection steps are as follows:

[0074] ⑴Make reference test block

[0075] 1.1 Cut the sample

[0076] Cut a length of 100mm on the product of the same batch of pre-stretched plate 13 to be tested, a rectangular sample with a width of 90mm and a thickness of 20mm, one of the largest surfaces of the rectangular sample is the rolling surface of the pre-stretched plate, the largest surface Call the sample rolling surface 5, the length of the rectangular sample is the same as the rolling direction of the pre-stretched plate, use the drilling method to measure the residual stress of the sample rolling surface 1, the number of measuring points is four, and its position 10mm away from the long side and 15mm away from the wi...

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Abstract

The invention provides a test block for carrying out ultrasonic inspection on residual stress of an aluminium alloy pre-stretching board by water immersion, belonging to the field of non-destructive inspection. A method for preparing the test block comprises the following steps of cutting a sample, processing the sample and installing the sample. In the method, the water immersion method is adopted for inspection, and the temperatures in stress calibration and stress measurement processes can be ensured to be consistent by controlling the water temperature not to be changed, thus eliminating the effects of temperature difference on the ultrasonic wave speed and eliminating temperature errors; besides, an automatic scanning frame is adopted instead of manual scanning, so that the distance between a probe and the surface of a material to be measured in the measurement process can be ensured not to be changed, thus eliminating the effects of coupling condition difference on sound propagation time and eliminating the coupling errors. The method is beneficial to non-destructive evaluation of the near surface residual stress of the aluminium alloy pre-stretching board.

Description

technical field [0001] The invention relates to a method for preparing a test block used for detecting the residual stress of an aluminum alloy pre-stretched plate, and belongs to the field of non-destructive testing. Background technique [0002] During forging, welding, heat treatment and other material processing processes, residual stress is often generated in the material due to deformation or inhomogeneity of thermal cycle. The existence of residual stress will affect the machinability, corrosion resistance, fatigue and other aspects of the material. In severe cases, it will cause deformation and cracking of the workpiece, which will affect the normal use of the workpiece. Measuring residual stress by using ultrasonic "acoustoelastic effect" is a new method of residual stress measurement. It has the advantages of fast measurement speed, convenient use, flexible measurement range, and good economy. More importantly, this method is non-destructive and can measure residu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/30G01N29/07
Inventor 王晓梁菁史亦韦林立志王弘
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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