通过分析和物理试验,确定了焊缝起弯角对疲劳寿命的影响

IF 2.4 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
D. Bradley Cook, Christy Lee, Donald Stickel
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引用次数: 0

摘要

采用线弹性断裂力学(LEFM)和物理试验两种方法,研究了机器人焊缝起始位置尖角对疲劳寿命的影响。2D LEFM结果显示,在脚趾再入角60度(锐角)至120度(钝角)范围内,应力强度因子(SIF)没有显著变化。3D LEFM用于比较理想的60度和90度焊缝开始几何形状的裂纹扩展速率。在这两种情况下,裂纹扩展是相同的。物理疲劳测试样品在焊接开始位置具有两个不同的趾可入角组,平均为68度和103度。两组在三个应力范围内的疲劳失效循环产生了相似的应力-寿命趋势。研究结果表明,在轴向载荷作用下,局部焊缝起始尖尖回入角在60 ~ 90°范围内变化对接头疲劳寿命影响不显著。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The influence of weld start reentrant angle on fatigue life determined through analysis and physical testing

The influence of weld start reentrant angle on fatigue life determined through analysis and physical testing

The influence of acute toe reentrant angle on fatigue life at a robotic weld start location was investigated both analytically using linear elastic fracture mechanics (LEFM) and through physical testing. 2D LEFM results show no significant change in stress intensity factor (SIF) within a toe reentrant angle range of 60 degrees (acute) to 120 degrees (obtuse). 3D LEFM was used to compare crack growth rates for idealized 60- and 90-degree weld start geometry. Crack propagation was identical for these two cases. Physical fatigue test specimens were created with two distinct toe reentrant angle groups averaging 68 and 103 degrees at the weld start locations. Fatigue failure cycles at three stress ranges for the two groups produced similar stress-life trends. The study concludes that local weld start acute toe reentrant angle change between 60 and 90 degrees does not significantly influence the joint fatigue life under axial loading.

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来源期刊
Welding in the World
Welding in the World METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
4.20
自引率
14.30%
发文量
181
审稿时长
6-12 weeks
期刊介绍: The journal Welding in the World publishes authoritative papers on every aspect of materials joining, including welding, brazing, soldering, cutting, thermal spraying and allied joining and fabrication techniques.
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