【摘要】 压痕应变法是近期出现的一种非常有价值的(焊接)残余应力测量技术,它具有无损、快捷、精确、成本低等特点。采用该技术测量残余应力时的误差大小或不确定度分析是人们关注的问题之一。应用B类评定法对采用该技术测量Q345低合金钢中焊接残余应力的不确定度进行了详尽分析,结果表明,应力相对不确定度的大小主要决定于应变的绝对值,低应变情况下的相对不确定度主要由重复性试验的应变不确定度决定。一般情况下,应力的标准不确定度数值为20～30MPa。更多还原

【Abstract】 The indentation strain method is a valuable residual stress measurement technique.It is nondestructive,rapid,and cost-effective with high precision.The measurement error or uncertainty is one of main factors concerned.A detail analysis has been demonstrated in measuring residual stresses in steel Q345 by the method with B-type measurement uncertainty evaluation.The results indicate that the relative stress uncertainty mainly depends on the absolute value of the strain and the strain uncertainty of repetitive test governs the relative strain uncertainty under lower strain values.Generally speaking,the amount of the stress standard uncertainty is 20～30 MPa.更多还原