Effect of fiber volume fraction on longitudinal tensile properties of SiCf/Ti-6Al-4V composites

Juhong Lou; Yanqing Yang; Shenquan Liu

doi:10.1007/s11595-017-1592-z

Journal of Wuhan University of Technology Materials Science Edition ›› 2017, Vol. 32 ›› Issue (2) : 278 -283. DOI: 10.1007/s11595-017-1592-z

Advanced Materials

Effect of fiber volume fraction on longitudinal tensile properties of SiC_f/Ti-6Al-4V composites

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Abstract

The longitudinal tensile properties of SiC_f/Ti-6Al-4V composites with different fiber volume fractions were simulated by the Monte Carlo 2-D finite element model. The random distribution of fiber strength was expressed by the two-parameter Weibull function. Meanwhile, contact elements and birth-death elements were used to describe the interfacial sliding process after debonding and fiber breakage (or matrix cracking) respectively, which was realized by subroutine complied in ANSYS-APDL (ANSYS Parametric Design Language). The experimental results show that the yield stress and ultimate tensile strength of SiC_f/Ti-6Al-4V composites increase with increasing fiber volume fraction, while the corresponding strain of them is just on the contrary. In addition, almost the same failure mode is obtained in SiC_f/Ti-6Al-4V composites with various fiber volume fractions when the interfacial shear strength is fixed. Finally, the tensile strength predicted by finite element analysis is compared with that predicted by Global load-sharing model, Local load-sharing model and conventional rule of mixtures, thus drawing the conclusion that Local load-sharing model is very perfect for the prediction of the ultimate tensile strength.

Keywords

composites / Monte Carlo finite element modelling / longitudinal tensile strength / fiber volume fraction

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Juhong Lou, Yanqing Yang, Shenquan Liu. Effect of fiber volume fraction on longitudinal tensile properties of SiC_f/Ti-6Al-4V composites. Journal of Wuhan University of Technology Materials Science Edition, 2017, 32(2): 278-283 DOI:10.1007/s11595-017-1592-z

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