双轴压缩载荷下裂纹动态传播的实验研究

本文研究了双轴压缩载荷下裂纹的起裂和非共面传播问题，用动态光弹性方法成功地记录下裂纹的动态扩展过程。获得了双轴压缩载荷下扩展裂纹的传播速度，临界开裂载荷以及开裂角第一系重要断裂参数。研究表明，在双轴压缩载荷下不闭合裂纹前缘应力场是一个混合型的奇异场，裂纹的扩展过程为稳态过程并且表现出显著的阶段性特点。

EXPERIMENTAL STUDIES ON DYNAMIC PROPAGATION OF CRACKS UNDER BIAXIAL COMPRESSION

This paper deals with the initiation and non-coplaner propagation of cracks under biaxial compression.Running process of the propagating cracks is successfully recorded with the method of dynamic photoelasticity. A series of important fracture parameters such as cracks' propagating velocity, critical loading of cracking and initial angle of cracks' growth under biaxial 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 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.