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Open AccessArticle

Elasto-Plastic Mechanical Properties and Failure Mechanism of Innovative Ti-(SiCf/Al3Ti) Laminated Composites for Sphere-Plane Contact at the Early Stage of Penetration Process

1
College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China
2
Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
3
College of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(7), 1152; https://doi.org/10.3390/ma11071152
Received: 24 May 2018 / Revised: 29 June 2018 / Accepted: 2 July 2018 / Published: 6 July 2018
(This article belongs to the Special Issue Intermetallic Alloys: Fabrication, Properties and Applications 2017)
A novel silicon carbide (SiC) continuous ceramic fiber-reinforced (CCFR) Ti/Al3Ti Metal-Intermetallic-Laminate (MIL) composite was fabricated. A high-efficiency semi-analytical model was proposed based on the numerical equivalent inclusion method (NEIM) for analyzing the small-strain elasto-plastic contact in the early stage of the penetration process. The microstructure and interface features were characterized by the scanning electron microscopy (SEM). Quasi-static compression tests were performed to determine the contact response and validate the proposed model. A group of in-depth parametric studies were carried out to quantify the influence of the microstructure. The comparison between results under the sphere-plane and plane-plane contact load indicates that, under the first sphere-plane, the compressive strength and failure strain are both lower and the SiC reinforcement effect on strength is very clear while the effect on ductility is not clear. 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 the depth direction as the load increases, which are also the locations where cracks may initiate and extend. Moreover, the CCFR-MIL composite shows better mechanical properties when the center distance between adjacent SiC fibers is four times the fiber diameter and the volume fraction of Ti is 40%. View Full-Text
Keywords: continuous SiC fiber; Ti/Al3Ti Metal-Intermetallic-Laminate (MIL) composite; microstructure characterization; elasto-PLASTIC mechanical properties; numerical equivalent inclusion method continuous SiC fiber; Ti/Al3Ti Metal-Intermetallic-Laminate (MIL) composite; microstructure characterization; elasto-PLASTIC mechanical properties; numerical equivalent inclusion method
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MDPI and ACS Style

Liu, J.; Zhang, L.; Jiang, F.; Zhang, M.; Wang, L.; Yun, F. Elasto-Plastic Mechanical Properties and Failure Mechanism of Innovative Ti-(SiCf/Al3Ti) Laminated Composites for Sphere-Plane Contact at the Early Stage of Penetration Process. Materials 2018, 11, 1152.

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