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A method of ultrasonic non-destructive measurement of internal residual stress field of metal sheet

A technology of internal residual stress and metal plates, applied in the direction of measuring force, measuring devices, instruments, etc., can solve the problems that it is difficult to measure and reflect the residual stress field of plates, and the measurement efficiency is low, so as to achieve fast detection speed, large measurement depth, Safe to use

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

AI Technical Summary

Problems solved by technology

On the other hand, the measurement efficiency of the above two traditional methods is low, and it is difficult to reflect the residual stress field in the plate through the measurement of different positions

Method used

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  • A method of ultrasonic non-destructive measurement of internal residual stress field of metal sheet
  • A method of ultrasonic non-destructive measurement of internal residual stress field of metal sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] 7050 aluminum alloy cold-rolled plate, length 2000mm, width 1500mm, thickness 5mm. The detection steps are as follows:

[0065] (1) Select the probe

[0066] Two ultrasonic longitudinal wave probes with a wafer diameter of 9 mm and a frequency of 5 MHz were selected.

[0067] (2) Wedge processing

[0068] 2.1 Measurement of longitudinal wave sound velocity in wedge material

[0069] The probe is connected to the transmitting / receiving interface of the pulse signal generator with a coaxial cable, and the output interface and the synchronous interface of the pulse signal generator are respectively connected with the input interface and the synchronous interface of the multi-channel digital oscilloscope through the coaxial cable. Process two opposite parallel planes on the wedge material, choose a point A on one of the planes, use a vernier caliper or a micrometer to measure the vertical distance S from this point to the opposite plane 楔块 = 15.0 mm. The ultrasonic pro...

Embodiment 2

[0089] The copper alloy cold-rolled plate of grade H80 is 500mm long, 100mm wide and 3mm thick. The detection steps are as follows:

[0090] (1) Select the probe

[0091] Two ultrasonic longitudinal wave probes with a wafer diameter of 6 mm and a frequency of 10 MHz were selected.

[0092] (2) Wedge processing

[0093] 2.1 Measurement of longitudinal wave sound velocity in wedge material

[0094] The probe is connected to the transmitting / receiving interface of the pulse signal generator with a coaxial cable, and the output interface and the synchronous interface of the pulse signal generator are respectively connected with the input interface and the synchronous interface of the multi-channel digital oscilloscope through the coaxial cable. Process two opposite parallel planes on the wedge material, choose a point A on one of the planes, use a vernier caliper or a micrometer to measure the vertical distance S from this point to the opposite plane 楔块 = 21.5 mm. The ultraso...

Embodiment 3

[0114] 08AL cold-rolled steel plate, 2000mm long, 500mm wide, and 6mm thick. The detection steps are as follows:

[0115] (1) Select the probe

[0116] Two ultrasonic longitudinal wave probes with a wafer diameter of 6 mm and a frequency of 10 MHz were selected.

[0117] (2) Wedge processing

[0118] 2.1 Measurement of longitudinal wave sound velocity in wedge material

[0119] The probe is connected to the transmitting / receiving interface of the pulse signal generator with a coaxial cable, and the output interface and the synchronous interface of the pulse signal generator are respectively connected with the input interface and the synchronous interface of the multi-channel digital oscilloscope through the coaxial cable. Process two opposite parallel planes on the wedge material, choose a point A on one of the planes, use a vernier caliper or a micrometer to measure the vertical distance S from this point to the opposite plane 楔块 = 11.5 mm. The ultrasonic probe is couple...

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Abstract

The invention belongs to the field of nondestructive testing and relates to a method for nondestructive measurement of a residual stress field in a metal plate through ultrasonic waves. The method for nondestructive measurement of the residual stress field in the metal plate through the ultrasonic waves is beneficial to conducting nondestructive evaluation on the residual stress in the metal plate. The single-time measuring time of the method is only about 20 seconds and is dozens of times less than the single-time measuring time of a traditional X-ray residual stress measuring method, and the detection speed is high; meanwhile, the measurement depth in the method is adjustable, the maximum depth can reach 3mm and is dozens of times that of the measuring depth in the X-ray measuring method, and thus the measuring depth is large. The method is provided for measuring large-range residual stress distribution inside the plate, and a three-dimensional diagram or a contour map of the residual stress distribution can be obtained. The cost for the single-time measuring of the method is dozens of times less than that of the X-ray measuring method, obvious economy is achieved. The method is free of radioactivity and is safer compared with the X-ray measuring method.

Description

technical field [0001] The invention belongs to the field of non-destructive testing, and relates to a method for ultrasonic non-destructive measurement of the internal residual stress field of metal plates. Background technique [0002] Metal sheets often produce wrinkling, warping and other deformations during rolling or heat treatment. In order to eliminate these deformations and obtain a flat plate shape, a leveling process is required. In this process, due to the different deformations in different positions of the plate, different residual stresses will be generated in different parts. The existence of residual stress will affect the mechanical properties of the plate, especially the fatigue performance, increase the fatigue crack growth rate of the plate, and affect the product qualification rate. At the same time, if there is too high residual tensile stress in the local area of ​​the plate, it will pose a threat to the safety of the plate. Therefore, there is an u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/25
Inventor 王晓梁菁史亦韦李国爱史丽军
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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