TS SPECIMEN LIFE PREDICTION OF HIGH-STRENGTH STEEL RESISTANCE SPOT WELDS

ZHANG Yu; LI DaYong; TANG WeiQin

doi:10.16579/j.issn.1001.9669.2016.05.011

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TS SPECIMEN LIFE PREDICTION OF HIGH-STRENGTH STEEL RESISTANCE SPOT WELDS

更新时间：2022-09-22

- TS SPECIMEN LIFE PREDICTION OF HIGH-STRENGTH STEEL RESISTANCE SPOT WELDS
- Journal of Mechanical Strength Vol. 38, Issue 5, Pages: 962-966(2016)
- 作者机构：
  
  1. 上海交通大学机械与动力工程学院
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2016.05.011
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ZHANG Yu, LI DaYong, TANG WeiQin. TS SPECIMEN LIFE PREDICTION OF HIGH-STRENGTH STEEL RESISTANCE SPOT WELDS. [J]. 38(5):962-966(2016)
DOI：

ZHANG Yu, LI DaYong, TANG WeiQin. TS SPECIMEN LIFE PREDICTION OF HIGH-STRENGTH STEEL RESISTANCE SPOT WELDS. [J]. 38(5):962-966(2016) DOI： 10.16579/j.issn.1001.9669.2016.05.011.

摘要

在使用裂纹扩展的方法预测焊点疲劳寿命时,裂纹尖端塑性区的存在会对寿命预测结果产生影响,而现有的大多数寿命预测方法在预测寿命的过程中并没有考虑裂纹尖端塑性对寿命预测结果的影响。针对几种不同的高强钢电阻点焊TS试样进行了疲劳寿命试验,得到了不同材料的疲劳寿命与裂纹扩展路径,在此基础上使用裂纹扩展的方法对TS试样的寿命进行了理论预测。考虑裂纹尖端的塑性变形,对理论寿命预测结果进行了塑性修正,修正后的曲线在高周疲劳区寿命预测结果几乎不变,在低周疲劳区寿命预测结果减小,寿命预测曲线变化趋势与实验结果相符合。高周疲劳由于载荷较小,塑性区半径小,所以塑性对疲劳寿命的影响小,低周疲劳区由于载荷较大,塑性区半径大,塑性对疲劳寿命影响较大。

Abstract

The plastic zone in crack tip influences life prediction result when using crack propagation method to predict fatigue life of spot welds. Most of the methods used to predict fatigue life don’t take plasticity into consideration. In this paper,TS specimen fatigue life of several high strength steels are tested and crack propagation method is used to predict theoretical fatigue life of TS specimen. Plasticity in crack tip is taken into consideration to modify the life prediction result. Predicted life in high cycle fatigue area barely change while life in low cycle fatigue area decrease after plastic modification. The modified life prediction result is in good agreement with experiment data. In high cycle fatigue area,plastic zone radium is small and has little influence on fatigue life because of low load. In low cycle fatigue area,plastic zone radium is big and influence life prediction result because of high load.

关键词

裂纹扩展TS试样疲劳寿命预测塑性修正

Keywords

Crack propagationTS specimenFatigue life predictionPlasticity

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