中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
Vol. 18 No. 3 June 2008 |
(School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China; )
Abstract:Three types of SiC fibers with different tensile strength were employed to prepare unidirectional titanium matrix composites. The strengths of the original SiC fibers and extracted fibers from the composites were measured. The results show that the mechanical properties of fibers are greatly damaged by the consolidation processing of the composite. The strength data of the extracted fibers are used to predict the strength of the composites according to two theoretic models. The Globe Load-Sharing(GLS) model overestimates the strength of the composites. If the Local Load-Sharing(LLS) model assumes that failure occurs after the formation of a cluster with three broken fibers, the model can predict the strength of the composites exactly.
Key words: SiC fiber; titanium-matrix composites; Weibull distribution; tensile strength