NEIM Based Modeling and Simulation Study of Innovative Ti-(SiCf/Al3Ti) Laminated Composites at the Early Stage of Penetration Process

doi:10.3901/JME.2018.22.063

Abstract

Abstract: A novel silicon carbide(SiC) continuous ceramic fiber-reinforced(CCFR) Ti/Al₃Ti metal-intermetallic-laminate(MIL) composite is fabricated, the microcosmic deformation, strengthening and failure mechanisms of which as an armor material during penetration process have not been investigated. Firstly, the microstructure and interface features of the material are characterized by scanning electron microscopy(SEM). And then, a novel model is built based on the high-efficiency numerical equivalent inclusion method(NEIM) for the contact between laminated composite and rigid ball at the early stage of penetration process, to analyze the small-strain elasto-plastic mechanical behaviors of Ti/Al₃Ti MIL with SiC fiber under quasi-static loading. The accuracy of the model is validated by an indentation test. The results indicate that, the compressive strength of CCFR-MIL composites are improved apparently through the introduction of SiC fibers under sphere-plane loading mode, while the SiC reinforcement effect for ductility is not as obvious as that under plane-plane loading mode. In addition, under sphere-plane loading mode, the maximum plastic strain concentration(MPSC) in the Al₃Ti layer is closest to the upper boundary of the central SiC fiber, and then extends along depth as the load increases, which are also the locations cracks may initiate and extend from. Moreover, CCFR-MIL composite shows better mechanical properties when the center distance between adjacent SiC fibers is quadruple fiber diameter, and the volume fraction of Ti is 40%.By means of the more efficientnumerical method, the computational costis saved, the microcosmic deformation, strengthening and failure mechanisms of the novel CCFR-MIL composite during penetration process are revealed more clearly and completely. Besides, the parametric studies are more comprehensive, which is beneficial to optimize the microstructure of the composite.

Key words: continuous SiC fiber, elasto-plastic mechanical properties, microstructure characterization, numerical equivalent inclusion method, Ti/Al₃Ti metal-intermetallic-laminate composite

CLC Number:

TB333

LIU Jingchuan, JIANG Fengchun, WANG Liquan, ZHANG Mengqi, YUN Feihong. NEIM Based Modeling and Simulation Study of Innovative Ti-(SiC_f/Al₃Ti) Laminated Composites at the Early Stage of Penetration Process[J]. Journal of Mechanical Engineering, 2018, 54(22): 63-77.

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NEIM Based Modeling and Simulation Study of Innovative Ti-(SiC_f/Al₃Ti) Laminated Composites at the Early Stage of Penetration Process

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