Prediction of Static Fracture Strength of Laser Welded Lap Joint by Numerical Analysis
Prediction of Static Fracture Strength of Laser Welded Lap Joint by Numerical Analysis
复制标题
激光焊接搭接接头静态断裂强度的数值分析预测
DOI：
10.2207/qjjws.21.419
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
T. Kitamura
中科院分区：
文献类型：
--
作者：
T. Terasaki;T. Kitamura
本研究的目的是探讨激光焊接搭接接头静态断裂强度的实验结果是否可以通过数值分析来预测。首先，设计了数值解析方法，对剪切试验中荷载与位移关系的试验结果进行了估计。其次，采用临界等效塑性应变的概念预测了搭接接头静态断裂强度的实验结果，即当最大等效塑性应变达到某一临界值时，搭接接头发生断裂。利用临界塑性应变的概念，预测了搭接接头在母材发生断裂时的静态断裂强度。然而，当搭接部分发生剪切破坏时，该概念无法预测搭接的抗剪强度。搭接接头的抗剪强度可以由焊缝金属的抗剪强度来预测。
The purpose of this study is to investigate whether experimental results of static fracture strength of lap joint made by laser welding can be predicted by numerical analysis or not. First, numerical analytical method was devised for estimating the experimental result of the relationship between load and displacement of shear test. Next, experimental result of static fracture strength was predicted by using the concept of critical equivalent plastic strain, that the lap joint is fractured when maximum equivalent plastic strain reaches a critical value. The static fracture strength of lap joint was predicted by the concept of critical plastic strain when fracture occurs in the base metal. However, when lap joint was broken by shear fracture in the joint part, shear strength of lap joint could not be predicted by the concept. The shear strength of lap joint could be predicted from the shear strength of weld metal.