Crack coalescence mechanism of brittle solids containing pores under uniaxial compression

To study crack coalescence mechanism is very important on understanding the basic failure mechanics of brittle solids containing pores under uniaxial compression. In this paper, a series of physical tests of uniaxial compression on samples containing pores with varied distribution mode are carried out to investigate the coalescence mechanism of pores including crack growth patterns, and pore coalescence modes. The experimental results shown that: The crack growth pattern is different with sample containing varied original distribution; Although the failure process of the brittle medium containing multiple pores is very complex, the behavior of crack initiation, propagation and coalescence follows some basic principles, most of which are related to the interaction between two or three pores. Based on the tension mode; the shear mode; the mixed tension/shear mode and a new coalescence type, the traction mode formed by the stress interaction in zones of pore bridge was found.