Numerical Simulation of Subcritical Crack Growth in Brittle Materials and Influence of Biaxial Stress

作者：Li Weihong^*

来源：Rare Metal Materials and Engineering, 2009, 38: 1112-1116.

• brittle materials
• subcritical crack-growth
• numerical simulation
• biaxial stress

The failure of brittle materials such as glass is always unstable. Therefore, it is usually difficult to observe in situ the subcritical crack growth in experiment with a brittle sample. This restricts the analysis of failure process and the study of crack resistance of brittle materials. Whether biaxial stress influences the crack growth of brittle materials is always a controversial issue. The aim of this study is to demonstrate the influence of the stress parallel to the crack plane on subcritical crack growth in brittle materials by numerical code MFPA2D. The mechanism of this influence is also discussed. The curves of subcritical crack extension vs. strain of brittle materials under biaxial and uniaxial stress were numerically obtained through numerical simulation test with acoustic emission characteristics. The results showed that the tensile stress parallel to the crack plane had the effect on crack arrest, while the compressive stress parallel to the crack plane contributed to crack opening for brittle materials in plane stress state. The numerical simulation results were consistent with correlative experimental result, which showed the reliability of the numerical simulation.

• 出版日期2009-12
• 单位大连理工大学