Identification of the elastic stiffness of composites using the virtual fields method and digital image correlation |
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Authors: | Lebin Jiang Baoqiao Guo Huimin Xie |
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Institution: | Lebin Jiang;Baoqiao Guo;Huimin Xie;Department of Engineering Mechanics,Tsinghua University;State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology; |
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Abstract: | 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. |
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