期刊
CHINESE SCIENCE BULLETIN
卷 57, 期 28-29, 页码 3773-3781出版社
SCIENCE PRESS
DOI: 10.1007/s11434-012-5319-4
关键词
micro-cracks; damage; evolution; coalescence
资金
- National Natural Science Foundation of China [11032002, 11172045]
Damage and failure of quasi-brittle materials are caused by the evolution and coalescence of micro-cracks. To solve the problem of elliptical micro-crack growth at the elastic deformation stage, a method of complex potential functions is proposed and the effect of the initial orientation on micro-crack growth and deflection is discussed. The critical stress condition for the initial damage is derived according to the criterion of micro-crack growth. Based on energy conservation during wing-crack propagation, a damage constitutive model is developed with the strain criterion created in the condition of micro-crack coalescence. The stress-strain curves of quasi-brittle materials in uniaxial compression obtained based on this model are examined with the experimental results.
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