Resent Development of some Issues in Dynamic Photoelastic Method
动光弹性法中若干问题的近期研究进展

In order to meet the growing needs of dynamic mechanical problems emerged in engineering, a brief introduction of the development of some key issues in dynamic photoelastic method is presented in this paper, based on the rapid development of computing technology, high-speed photography and image processing technology in recent years. It includs: (1) the development of a new digital dynamic photoelastic instrument. It adopts laser light instead of multiple spark discharge light source to achieve a continuous, real-time high-intensity light source, and applies high-speed camera system to replace the former multiple cameras shooting system, and uses computer software to control the entire system installations to achieve the optimal image acquisition and provide a strong guarantee for the digital image processing. (2) Static and dynamic photoelastic material exploration. It focuses on the new formula and new technology of dynamic photoelastic model materials. It uses silicon rubber mold without the release agents, to pouring epoxy resin sheet or block form under room temperature. It can be precision cast and shaped at once. Material has good mechanical properties of light. (3) Dynamic Photoelasticity Engineering Applications. The use of new digital dynamic photoelastic apparatus and new epoxy process in practice and obtained some valuable results. Taking a steering gear and ship base and key column and column caps joints of coastal engineering as examples, dynamic stress analysis was carried out. It proves that the new instruments and new materials can meet the test requirements and has broad prospect.