光弹性-数字散斑相关混合法在光弹条纹主应力分解中的应用  

On the Application of Photoelasticity-Digital Speckle Correlation Hybrid Method in Separation of Main Stress Photoelastic Fringes

作　　者：李斌[1] 杨国标[1,2] 

机构地区：[1]同济大学航空航天与力学学院,上海200092 [2]同济大学国家力学实验教学示范中心,上海200092

出　　处：《实验力学》2013年第2期180-186,共7页Journal of Experimental Mechanics

基　　金：国家自然科学基金(10972160);国家自然科学基金(11272239)资助

摘　　要：光弹性法是研究结构内部应力分布问题的一个有效方法。光弹性实验中,通常可以方便地得到等色线条纹图。确定了等色线条纹级数以后,为获得平面模型中任意点的应力完全解,需要借助其它方法给出一个补充方程。本文将光弹性法与数字散斑相关法相结合,提出一种用于光弹性法分离主应力的新方法:光弹性-数字散斑相关混合法。在理论研究的基础上,设计了光弹性-数字散斑相关混合法实验系统,并通过相应的三点弯曲实验对该方法和实验系统的有效性做出分析和论证。该研究为光弹全场应力分解以及动态光弹性-数字散斑相关混合法提供了理论和实验基础。Photoelasticity is an effective method for structure internal stress distribution study,and is widely applied in engineering practice.Separation of principal stress is the key and difficult point in data analysis.In order to achieve that,an additional fuction is necessary.In this paper,Photoelasticity-Digital Speckle Correlation Hybrid Method is introduced to this problem.This method has combined photoelasticity method with digital speckle correlation method.On the basis of theory study,experimental system for Photoelasticity-Digital Speckle Correlation Hybrid Method were also designed.Corresponding three-point bending experiment was carried out to verify the effectiveness of this experimental system.This study may provide theoretical and experimental foundation for Dynamic Photoelasticity-Digital Speckle Correlation Hybrid Method.

关 键 词：光弹性 数字散斑相关 混合法 等色线条纹 主应力分离 

分 类 号：O348.11[理学—固体力学]