Abstract
The strain-rate-dependent behavior of a toughened matrix composite (IM7/8552) was characterized under quasi-static and dynamic loading conditions. Unidirectional and off-axis composite specimens were tested at strain rates ranging from 10−4 to 103 s−1 using a servo-hydraulic testing machine and split Hopkinson pressure bar apparatus. The nonlinear response and failure were analyzed and evaluated based on classical failure criteria and the Northwestern (NU) failure theory. The predictive NU theory was shown to be in excellent agreement with experimental results and to accurately predict the strain-rate-dependent failure of the composite system based on measured average lamina properties.
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Acknowledgments
The work described in this paper was sponsored by the Office of Naval Research (ONR). The authors are grateful to Dr. Y.D.S. Rajapakse of ONR for his encouragement and cooperation.
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Schaefer, J.D., Werner, B.T. & Daniel, I.M. Strain-Rate-Dependent Failure of a Toughened Matrix Composite. Exp Mech 54, 1111–1120 (2014). https://doi.org/10.1007/s11340-014-9876-0
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DOI: https://doi.org/10.1007/s11340-014-9876-0