Failure behavior of 2D C/SiC I-beam under bending load

摘要

In this paper the failure behavior of 2D C/SiC I-beam under bending load was experimentally and numerically investigated. Due to material nonlinearity, the stress redistribution can be found with load increasing. As a result of the inhomogeneity of matrix density, the strength of 2D C/SiC may be different for the top flange and the bottom flange, and especially the difference between tensile strength of top flange and compressive strength of bottom flange plays a critical role in determining the failure modes of 2D C/SiC I-beam. On the other hand, because of the characteristics of manufacture techniques, 2D C/SiC I-beam can be treated as a kind of composite structures with substructures and interfaces. Then, the failure of 20 C/SiC I-beam can be accompanied with delamination of the interfaces. To understand the delamination behavior, the cohesive zone model was adopted and a discount method was used to estimate the properties of the interfaces. Finally, the delamination mechanism was studied. (C) 2015 Elsevier Ltd. All rights reserved.