Measurement Method for Continua by Image Processing

Abstract

In this study, the measurement system for continua using the image processing technique is developed. At first, a correlation-based template that matches an Eulerian coordinate system is extended to trace the motion of material points in a Lagragian coordinate system and its accuracy is updated by including deformation of the template in the matching procedure. Then, a correction method for the measured deformation field is proposed. In this method, the measured deformation field is modified under a volumetric constraint condition in order to obtain a reasonable deformation field. To evaluate the accuracy and the applicability of the system developed, it is utilized in the experiments of tuned liquid dampers, laminated rubber bearings and cylindrical lead tensile specimens in order to measure the deformation field. The measurement results indicate that even when the object generates strain field larger than 100%, the system can capture its two- or three-dimensional behavior well, and the system is shown to be promising for rational and quantitative evaluation of these devices only using the experimental results.