Optical Analysis of Stress and Strain in Photoelastic Particle Assemblies

摘要

Optical methods for determining stresses and strains in assemblies of photoelastic granular material, and a device for performing systematic measurements in scale models of practical problems and material testing devices were developed. A method for determining two stress components in a three-dimensional plane strain sample; a calculation procedure for determining absolute stresses; and a prototype of a device for performing the measurements are described. A computer-controlled optical device equipped with a digital camera was produced. Stresses and displacements can be measured simultaneously. The measuring method was successfully applied to analyzing the mechanical behavior of granular materials in several tests, which simulate practical problems and material testing devices.