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屈服状态下盲孔法测量残余应力孔边应变释放系数修正
Strain Releasing Factor Amendment of Hole Edge under the Yield Status
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- DOI:
- 作者:
- 刘晓红1,苏文桂1,张运泉2,余红东1
- 作者单位:
- 1.广西大学机械工程学院,广西 南宁 530004;2.广西玉柴机器股份有限公司,广西 玉林 537005
- 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
Blindhole method; Yield status; Welding residual stress; Plastic deformation correction; Finite element method (FEM)
- 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 blindhole method are derived from flexible conditions. In order to measure materials residual stress in the yield status, blindhole 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.