全息动光弹性旋光法研究

本文提出了一个在全息动光弹性瞬态平面应力问题中同时获得分离的等差线及等和线条纹并分解平面瞬态应力的方法。文中给出了框架在冲击荷载作用下不同时刻等差线及等和线的分离条纹图和某个截面不同时刻的动态应力分布。

STUDY OF THE LIGHT ROTATION METHOD IN DYNAMIC HOLOPHOTOELASTICITY

A method which allows simultaneously separating the isochromatic and isopachic fringes for transient plane stress problems is presented. A set of double pulsed ruby laser and a terbium glass Faraday rotator are used. Double-order timing method is applied in the synchronous system of the impact load and trigger circuit. Separated fringe patterns of a structure component are recorded at nine different instants after impact loading, and the dynamic material-fringe values of isochromatics and isopachics are obtained by experiments. Finally, dynamic stresses distributed along a section at different instanss are resolved.