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EXPERIMENTAL STUDIES ON DYNAMIC PROPAGATION OF CRACKS UNDER BIAXIAL COMPRESSION

Yu Hengwen (University of Science & Technology of China,Hefei 230026,P.R.China) Song Jinliang (Tianjin University,Tianjin 300072,P.R.China) Feng Deyi Jian Chun (Tianjin Seismological Bureau,Tianjin 300070,P.R.China)  
This paper deals with the initiation and non-coplaner propagation of cracks under biaxial compression.The running process of the propagating cracks is successfully recorded with the method of dynamic photoclasticity.A series of important fracture parameters such as cracks' propagating velocity,critical opening loading and initial angle of cracks' growth under hiaxial compression is calculated.Results show that the stress field in front of the non-closed crack tip under biaxial compression is a mixed-mode singular field,the dynamic propagation of the new tensile cracks is just stable and shows distinct stages,but the unstable crack appears under high loads and results in the rupture of the matrix.
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