Experimental and Numerical Evaluations for Failure Mechanism of Notched C_f/Mg Composite

Abstract

Composite damage behavior was simulated based on the Hashin failure criterion and stiffness degradation scheme, and the damage behavior of the interlayer was modeled using the cohesive element. A carbon-fiber-reinforced magnesium (C_f/Mg) composite was prepared by the liquid–solid-extrusion-following-vacuum-infiltration technique. Its damage and failure behavior were characterized and the fracture surface was analyzed. A good agreement was obtained between the finite-element methods and experimental results. The strength of the notched C_f/Mg composite decreased with an increase in notch size. Damage occurred first in the interface layer, which then expanded within or between layers under load and caused the final failure of the C_f/Mg composite. Fiber failure dominated the carrying capacity of the C_f/Mg composite, and the major fracture behavior of the composite layer was matrix compression failure in a 90° layer.

Keywords:

• Composites
• failure analysis
• magnesium
• modeling and simulation

Acknowledgments

The authors are grateful for the financial supports by the National Nature Science Foundation of China (No. 51905426), Natural Science Basic Research Plan in Shaanxi Province of China (NO. 2020JQ-782), the Scientific Research Program Funded by Shaanxi Provincial Education Department (NO.19JK0671), and Technology Innovation Leading Program of Shaanxi (Program No. 2020CGHJ-011).