Welding residual stress evaluation law under cyclic tensile load

YU Jinpeng; ZHU Zhongyin; HE Tian; HUANG Xuefei

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Welding residual stress evaluation law under cyclic tensile load
Vol. 48, Issue 3, Pages: 97-101(2018)
Published：2018
DOI：
稿件说明：

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DOI：

YU Jinpeng, ZHU Zhongyin, HE Tian, et al. Welding residual stress evaluation law under cyclic tensile load[J]. Eletric Welding Machine2018, 48(3): 97-101. DOI：

摘要

采用便携式i XRD残余应力仪测量6 mm厚A6005-T6铝合金平板试样焊接后的残余应力

利用PWS-100低频疲劳试验机对平板试样进行低周次的循环加载

采用QBG-100高频疲劳试验机

试验频率100 Hz

进行3个阶段的加载

测出不同加载方式下的应变量。结果表明:在低周次的动态循环载荷下

号应变片总应变演变趋势为第1次循环加载后

号应变片的总应变均有变化

为正值

在第2次到10 000次的循环范围内

随着循环加载次数的增加

号应变片的总应变未随着循环次数的变化而变化。在高周次的循环加载中

加载次数从1万次到1 000万次

号应变片的总应变量基本保持不变

即在1×10

×10

循环加载过程中

材料未再产生新的塑性变形

说明焊接残余应力未随着循环次数的增加而继续发生松弛。

Abstract

Low cycle loading testing method with the PWS-100 low frequency fatigue machine and high cycle loading testing method with the QBG-100 high frequency fatigue machine were used to test the A6605-T6 aluminum alloy welded joints. The dynamic strain test machine was used to test the strain value of the above two fatigue method. The results showed that the strain value of No.1

all changed after the first time loading under the low cycle loading method but the strain value didn’t change after second time loading to10 million times loading. With the cycle times have changed from 10 thousand times to 10 million times

the strain value of N0.1

didn’t change. So the results showed that the welded joints didn’t show new plastic deformation with the increase of the cycle times

so the welding residual stress didn’t continue to relax with the incrrease of the cycle times.