Effect of Strain Gage Length When Determining Residual Stress by Slitting
Effect of Strain Gage Length When Determining Residual Stress by Slitting
复制标题
通过切割确定残余应力时应变计长度的影响
DOI：
10.1115/1.2400263
复制
发表时间：
2007
影响因子：
1.2
通讯作者：
M. R. Hill
中科院分区：
文献类型：
--
作者：
Matthew J. Lee;M. R. Hill
本文研究了应变片长度对用切口法（或裂纹柔度法）估算的残余应力的影响。这种影响是量化的标距长度的范围归一化样品厚度，升，在0.005和0.100之间。对于特定的lit值，柔度矩阵元素是由有限元方法确定的裂纹深度和多项式基函数的残余应力的范围。所得到的柔度矩阵被示出并用于确定残余应力中的误差，该误差可能是由于在数据简化中假设的LIT中的差异以及在切割实验中存在的差异而引起的。误差随着假设和实际载荷之间的差异的增加而单调增加，并达到峰值应力的14%的均方根误差。为了避免这种误差，提出了一种方案，允许从表列系数计算0.005≤l/t ≤0.100的柔度矩阵，并将均方根误差限制在峰值应力的2%以内。提供了一个例子来说明应用程序的数据减少计划的实验室数据。
This paper investigates the effect of strain gage length on residual stress estimated by the slitting (or crack compliance) method. This effect is quantified for a range of gage length normalized by sample thickness, lit, between 0.005 and 0.100. For specific lit values, compliance matrix elements are determined by finite element methods for a range of crack depth and polynomial basis functions for residual stress. Resulting compliance matrices are shown and used to determine error in residual stress that may arise due to differences in lit assumed in data reduction and existing in the slitting experiment. Errors increase monotonically with increasing difference between assumed and actual lit and reach a root-mean-square error of 14% of peak stress. In order to avoid such errors, a scheme is presented that allows compliance matrices to be computed for 0.005≤l/t ≤0.100 from tabulated coefficients and limits root-mean-square error to <2% of peak stress. An example is provided to illustrate the application of the data reduction scheme to laboratory data.