摘要
盲孔法测量残余应力计算公式是在弹性条件下推导出来的。为了测量材料屈服状态下的残余应力,必须对盲孔释放法进行修正,以消除孔边塑性变形对测量精度的影响。通过使用基于孔边形状改变比能S的A、B系数修正法,使盲孔法测量焊接残余应力的精度得到提高,并且扩大了应力值的测量范围。与其它的修正方法相比,结合有限元数值计算的基于孔边形状改变比能S的A、B系数修正法简单易行,更适合于实际的工程应用。
The residual stress measurement formulas based on blind-hole method are derived from flexible conditions. In order to measure materials＇ residual stress in the yield status, blind-hole releasing method must be amended to eliminate hole edge plastic deformation affects, which influences the measurement accuracy. By coefficient A, B correction method based on specific energy S modification according to hole edge shape, the measurement accuracy of welding residual stress is improved and the measurement scale is extended. Comparing to other methods, this combined finite element numerical calculation method is much easier in practical engineering applications.
出处
《铸造技术》
CAS
北大核心
2010年第1期36-39,共4页
Foundry Technology
基金
广西自然科学基金项目(桂科自013505)
关键词
盲孔法
屈服状态
焊接残余应力
塑性变形修正
有限元法
Blind-hole method
Yield status
Welding residual stress
Plastic deformationcorrection
Finite element method （FEM）
