Establishment of the modified model for residual stress measurement by LCR wave

HUO Qiaoying; XUE Haifeng; GOU Guoqing

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Establishment of the modified model for residual stress measurement by LCR wave
Vol. 48, Issue 3, Pages: 275-280(2018)
Published：2018
DOI：
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DOI：

HUO Qiaoying, XUE Haifeng, GOU Guoqing. Establishment of the modified model for residual stress measurement by LCR wave[J]. Eletric Welding Machine2018, 48(3): 275-280. DOI：

摘要

对7N01铝合金母材进行热处理

制备具有不同晶粒度的试样

定性分析其晶粒度。通过单轴拉伸标定实验测试热处理试样的应力常数K

发现材料的晶粒度越大

应力常数K越大。自行搭建超声波测试平台

基于基准波形和采集波形进行互相关计算

得到各个晶粒度试样的相对t

发现材料的t

与晶粒度也成正相关关系。使用电压幅值表征材料的声衰减后

建立超声衰减与应力常数K、t

之间的关系

拟合得到超声衰减与K、t

的本构方程。建立关于临界折射纵波衰减度和传播时间的修正模型

使用电压幅值表征K、t

的变化。

Abstract

Specimens of the 7 N01 aluminum alloy with different grain sizes were prepared by means of heat treatment in this paper in order to analysis the grain size qualitatively. The stress constant K of the specimens after heat treatment was calibrated by uniaxial tensile calibration test. The results showed that the stress constant K increased with the material grain size increasing. The author built the ultrasonic testing platform in this paper. The nominal t

of the specimens was get based on the cross correlation calculation between reference waveform and capture waveform. The material t

was also positively associated with the grain size. The relationships between K

and voltage attenuation were established in this paper. Then

the constitutive equation of K

and voltage attenuation was fitted. Therefore

the modified model between the attenuation of LCR wave and the propagation time was established in this paper

and the change of K and t

were represented by the voltage amplitude.