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Method for carrying out ultrasonic inspection on residual stress of aluminium alloy pre-stretching board by water immersion

A residual stress, pre-stretching plate technology, applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, and measuring devices, etc., can solve the difficulty of non-destructive measurement, measurement result error, ultrasonic residual Stress measurement error and other problems, to achieve the effect of fast detection speed, large measurement depth and good economy

Active Publication Date: 2014-01-29
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This effect is negligible when using ultrasonic waves to detect defects in materials, but the change in ultrasonic propagation speed caused by stress is also small, so the change in temperature will bring huge errors to the measurement of ultrasonic residual stress
On the other hand, since the method of fixed propagation distance is often used to convert the change of propagation velocity into the change of propagation time in the ultrasonic measurement of stress, the thickness of the coupling layer will also bring a certain degree of error to the measurement results
In summary, the non-destructive measurement of near-surface residual stress of aluminum alloy pre-stretched panels is very technically difficult

Method used

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  • Method for carrying out ultrasonic inspection on residual stress of aluminium alloy pre-stretching board by water immersion
  • Method for carrying out ultrasonic inspection on residual stress of aluminium alloy pre-stretching board by water immersion
  • Method for carrying out ultrasonic inspection on residual stress of aluminium alloy pre-stretching board by water immersion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]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:

[0043] ⑴Make reference test block

[0044] 1.1 Cut the sample

[0045] 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...

Embodiment 2

[0065] 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:

[0066] ⑴Make reference test block

[0067] 1.1 Cut the sample

[0068] 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

[0088] 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:

[0089] ⑴Make reference test block

[0090] 1.1 Cut the sample

[0091] 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 method 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. The method comprises the following steps of preparing a reference block; carrying out measurement and calibration; measuring the residual stress. In the method, the water immersion method is adopted, 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 water immersion ultrasonic detection method for the residual stress of an aluminum alloy pre-stretched plate, which belongs to the field of non-destructive detection. Background technique [0002] In order to meet the needs of reducing the weight and increasing the strength of the aircraft, the large structural parts on the new aircraft are gradually transitioning from the rib riveted structure to the integrated structure. Aluminum alloy pre-stretched sheet is a new type of high-strength and lightweight material used to make large-scale integrated parts of aircraft. It has large-scale applications in aircraft fuselage, wings and other parts. In the process of machining integral parts from aluminum alloy pre-stretched sheets, it is often necessary to remove a large amount of material. If there is a large residual stress in the pre-stretched plate, these residual stresses will be released during the material removal process, r...

Claims

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Application Information

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IPC IPC(8): G01N29/07G01N29/32G01N29/26
Inventor 王晓史亦韦梁菁乔海燕韩波
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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