<title>Large deformation and mechanical behavior analysis using temporal speckle pattern interferometry</title>

Abstract

Ballistite and polymer materials are one kind of special composite material possessing the special properties of large deformations under loading. Because they have wide applications in aerospace industry and strong effects on the reliability and stability of the aerostats, experimental measuring the mechanical behaviors of these materials is highly emphasized. However, due to their special properties of the large and time-dependent deformations under loading, it is hard to use conventional optical methods to analyze their mechanical behavior. In this paper, two methods, scanning phase method (SPM) and time sequence phase method, have been used to large and time-dependent deformation analysis for ballistite and polymer materials. The deformation and creep behavior of the ballistite material is experimentally measured and analyzed under thermal loading and mechanical loading. Meanwhile, the large deformation of the polymer material is also measured under mechanical loading. The experiment results including the material parameters, the deformation and the creep curves are presented. The applicability and performance of these two methods are also discussed.