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Structural Engineering and Mechanics Volume 50, Number 2, April25 2014 , pages 231-240 DOI: https://doi.org/10.12989/sem.2014.50.2.231 |
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Fatigue modeling of chopped strand mat/epoxy composites |
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M.M. Shokrieh, M. Esmkhani and F. Taheri-Behrooz
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| Abstract | ||
| In the present research, fatigue behavior of chopped strand mat/epoxy composites has been studied with two different techniques. First, the normalized stiffness degradation approach as a well-known model for unidirectional and laminated composites was utilized to predict the fatigue behavior of chopped strand mat/epoxy composites. Then, the capability of the fatigue damage accumulation model for chopped strand mat/epoxy composites was investigated. A series of tests has been performed at different stress levels to evaluate both models with the obtained results. The results of evaluation indicate a better correlation of the normalized stiffness degradation technique with experimental results in comparison with the fatigue damage accumulation model. | ||
| Key Words | ||
| fatigue; normalized stiffness degradation; damage accumulation; short fibers; chopped strand mat | ||
| Address | ||
| M.M. Shokrieh, M. Esmkhani and F. Taheri-Behrooz : Composites Research Laboratory, Center of Excellence in Experimental Solid Mechanics and Dynamics, School of Mechanical Engineering, Iran University of Science and Technology, 16846-13114 Tehran, Iran | ||