Numerical-experimental hybrid method for stress separation in digital gradient sensing method
Numerical-experimental hybrid method for stress separation in digital gradient sensing method
复制标题
数字梯度传感方法中应力分离的数值实验混合方法。
DOI：
10.1016/j.optlaseng.2014.08.017
复制
发表时间：
2015-03-01
影响因子：
4.6
通讯作者：
Cheng, Heming
中科院分区：
文献类型：
--
作者：
Zhang, Rui;Guo, Ran;Cheng, Heming
A numerical-experimental hybrid method for the stress separation in the digital gradient sensing (DGS) method is proposed in this study. In the proposed hybrid method, boundary conditions for a local finite element model, that is, nodal force along boundaries are inversely determined from experimental values obtained by the digital gradient sensing method. The hybrid method follows two stages. In stage 1, the DGS method measures the Cartesian stress gradient components directly and, subsequently, the sum in Cartesian stresses at all interesting points on the surface; stress sum are used to compute the unknown boundary conditions for the local model. In stage 2, the individual stress components are calculated by the direct finite element method using the computed boundary conditions from stage 1. The effectiveness is demonstrated by applying the proposed method to a stress concentration problem involving concentrated load acting on an edge of a large planar sheet. The individual stress components thus determined are summed and compared with analytical stress sum, confirming the effectiveness and accuracy of the proposed technique. (C) 2014 Elsevier Ltd. All rights reserved.
