Identification of the elastic stiffness of composites using the virtual fields method and digital image correlation  

作　　者：Lebin Jiang Baoqiao Guo Huimin Xie 

机构地区：[1]Department of Engineering Mechanics,Tsinghua University [2]State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology

出　　处：《Acta Mechanica Sinica》2015年第2期173-180,共8页力学学报（英文版）

基　　金：supported by the National Basic Research Program of China("973" Project)(2010CB631005 and 2011CB606105);the National Natural Science Foundation of China (11232008,91216301,11227801,and 11172151);the Tsinghua University Initiative Scientific Research Program

摘　　要：This paper presents an effective methodology for characterizing the mechanical parameters of composites using digital image correlation combined with the virtual fields method.By using a three-point bending test configuration,this method can identify all mechanical parameters of the material with merely a single test.Successful results verified that this method is especially effective for characterizing composite materials.In this study,the method is applied to measure the orthotropic elastic parameters of fiber-reinforced polymer-matrix composites before and after the hygrothermal aging process.The results indicate that the hygrothermal aging environment significantly influences the mechanical property of a composite.The components of the parameters in the direction of the fiber bundle decreased significantly.From the accuracy analysis,we found that the actual measurement accuracy is sensitive to a shift of the horizontal edges and rotation of the vertical edges.This paper presents an effective methodology for characterizing the mechanical parameters of composites using digital image correlation combined with the virtual fields method.By using a three-point bending test configuration,this method can identify all mechanical parameters of the material with merely a single test.Successful results verified that this method is especially effective for characterizing composite materials.In this study,the method is applied to measure the orthotropic elastic parameters of fiber-reinforced polymer-matrix composites before and after the hygrothermal aging process.The results indicate that the hygrothermal aging environment significantly influences the mechanical property of a composite.The components of the parameters in the direction of the fiber bundle decreased significantly.From the accuracy analysis,we found that the actual measurement accuracy is sensitive to a shift of the horizontal edges and rotation of the vertical edges.

关 键 词：DIC VFM Characterization Composite 

分 类 号：O341[理学—固体力学]