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Axial Tensile Failure Analysis of SiCf/Ti Composite Based on Continuum Cohesive Zone Model

  • Zhigang SunEmail author
  • Jianfen Sun
  • Yaning Chang
  • Weiyi Sun
  • Lu Qi
  • Yingdong Song
Article
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Abstract

In this paper, the failure behavior of SiC fiber-reinforced Ti-6Al-4V matrix composite (SiCf/Ti) under longitudinal loads was studied experimentally and theoretically. Experimental results show that the interface of SiCf/Ti composite is continuous and integral. Through SEM observations, it was found that transverse matrix cracks initiated from the debonding region of the interface. A three-dimensional representative volume element was developed to simulate the failure process of SiCf/Ti-6Al-4V composite. A continuum cohesive zone model is employed to describe the debonding behavior at the interface, compared with a discrete one. More accurate simulated results were obtained by a continuum cohesive zone model, corresponding to experimental results. The transverse cracking behavior of the matrix was simulated. The stress–strain curves predicted by the continuum cohesive zone model show a good agreement with the experimental results. The fiber volume fraction, interface strength and interface toughness are investigated to exhibit their influences upon the longitudinal mechanical characteristics of SiCf/Ti-6Al-4V composite.

Keywords

axial tensile test continuum cohesive zone model failure simulation SiCf/Ti-6Al-4V composite 

Notes

Acknowledgments

This work was supported in part by National Basic Research Program of China, National Natural Science Foundation of China (51675266), Aeronautical Science Foundation of China (2014ZB52024), and the Fundamental Research Funds for the Central Universities (NJ20160038), the 2016 graduate innovation base (Laboratory) open fund (kfjj20160213), Foundation of Graduate Innovation Center in NUAA (no. kfjj20170208), Foundation of Graduate Innovation Center in NUAA (no. kfjj20170220) are gratefully acknowledged.

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Copyright information

© ASM International 2019

Authors and Affiliations

  • Zhigang Sun
    • 1
    Email author
  • Jianfen Sun
    • 1
  • Yaning Chang
    • 1
  • Weiyi Sun
    • 1
  • Lu Qi
    • 1
  • Yingdong Song
    • 1
  1. 1.Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Information Technology and College of Energy and Power EngineeringNanjing University of Aeronautics and AstronauticsNanjingPeople’s Republic of China

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