斜射法应力分离计算方法的研究  

STUDY ON CALCULATION METHOD OF STRESS SEPARATION BY OBLIQUE INCIDENCE TECHNIQUE

作　　者：刘晓蒙[1] 戴曙光[1] 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《机械强度》2016年第3期475-479,共5页Journal of Mechanical Strength

基　　金：上海市研究生创新基金项目(JWCXSL1301)资助~~

摘　　要：光弹性实验获取的数据,只给出了构件内部任意一点的主应力差值及其方向。为求取平面应力的三个分量,还需要建立补充方程进行应力分解。使用斜射法计算应力分量时,考虑到实验获取数据不精确的特点,可以采用多角度斜射,构成非线性超定方程组求解应力分量。传统方法对于非线性超定方程组的求解较为困难,将非线性超定方程组叠加,改为求最小绝对值,可以使用粒子群算法求解应力分量。通过计算机仿真径向受压的圆盘,选取10个斜射角度,建立方程组求出应力分量,验证了粒子群算法的可行性,得到了满意的仿真实验结果。In photoelasticity,the experiment gives only the difference of principal stresses and their directions. In order to obtain three plane stress components,the supplementary equations are required. Using oblique incidence method one can obtain the three plane stress components. Considering the experimental data is not accurate,multi-angle oblique incidence established nonlinear overdetermined equations are used to calculate stress components. Conventional method for solving nonlinear overdetermined equations is difficult,new particle swarm optimization algorithms are proposed for oblique incidence stress separation. Demonstration of the method on disc under diametral compression is performed using computer simulation. The method is effective and simple for stress separation,providing whole field stress components.

关 键 词：光弹性法 应力分离 斜射法 粒子群算法 

分 类 号：O348.1[理学—固体力学]