Intralaboratory Repeatability of Residual Stress Determined by the Slitting Method
Intralaboratory Repeatability of Residual Stress Determined by the Slitting Method
复制标题
通过切割方法测定残余应力的实验室内重复性
DOI：
10.1007/s11340-007-9085-1
复制
发表时间：
2007
影响因子：
2.4
通讯作者：
Michael R. Hill
中科院分区：
文献类型：
--
作者：
Matthew J. Lee;Michael R. Hill
本文提出了重复切割方法测量相同制备样品厚度上的残余应力与深度剖面的关系，这是为了评估该方法的可重复性。测量是在从单块 316L 不锈钢板上切下的 5 个 17.8 毫米厚的块中进行的，该块经过均匀的激光喷丸处理以产生深层残余应力场。采用典型的切割方法技术，在试样背面安装单个金属箔应变计，并通过线切割进行增量切割。对测得的残余应力分布进行分析，以评估残余应力随距表面深度的变化。喷丸表面的平均深度剖面的最大值为 -668 MPa。最大变异也发生在表面，标准偏差为 15 MPa，绝对最大偏差为 26 MPa。由于测量的残余应力超过了未处理板的屈服强度，因此将显微硬度与深度分析和弹塑性有限元分析相结合，以限制非弹性变形引起的测量误差。
This paper presents repeated slitting method measurements of the residual stress versus depth profile through the thickness of identically prepared samples, which were made to assess repeatability of the method. Measurements were made in five 17.8 mm thick blocks cut from a single plate of 316L stainless steel which had been uniformly laser peened to induce a deep residual stress field. Typical slitting method techniques were employed with a single metallic foil strain gage on the back face of the coupon and incremental cutting by wire EDM. Measured residual stress profiles were analyzed to assess variability of residual stress as a function of depth from the surface. The average depth profile had a maximum magnitude of −668 MPa at the peened surface. The maximum variability also occurred at the surface and had a standard deviation of 15 MPa and an absolute maximum deviation of 26 MPa. Since measured residual stress exceeded yield strength of the untreated plate, microhardness versus depth profiling and elastic–plastic finite element analysis were combined to bound measurement error from inelastic deformation.