Displacement Distribution Measurement and Stress Distribution Evaluation Technique by Using Hybrid Sampling Moiré Method

Abstract

For evaluating reliability of structures, it is important to know the distribution of displacement, strain and stress. In this paper, a hybrid sampling moiré method, which combines whole-field measurement technique, i.e. sampling moiré method, and finite element (FE) analysis is proposed for evaluation the stress distribution. The distribution of displacement measured by using the sampling moiré method is compared with the analyzed result based on elastic FE analysis at assumptive boundary conditions. The error between the displacement distribution of experimentally obtained and FE analysis is corrected so as to make it minimum by changing the boundary conditions such as loading force, loading position, etc. Experimental results show that the boundary conditions of loading force and loading position can be evaluated accurately using the proposed method. Once the appropriate boundary conditions are determined, three-dimensional distributions of strain and stress are easily obtained by FE analysis for evaluating reliability of structures.