A delayed failure of inhomogenous brittle material under shock wave compression

作者：Chen Deng-Ping^*; He Hong-Liang; Li Ming-Fa; Jing Fu-Qian

来源：Acta Physica Sinica, 2007, 56(1): 423-428.

• shock wave
• inhomogenous brittle materials
• failure wave
• microscopic defect

The failure property of inhomogenous brittle materials under plate impact experiment has been studied by using AOW (amphibolized olivine websterite) rock as a representative sample. A small recompression signal was observed in the VISAR record of the rear free surface velocity at shock stress much below sigma(HEL ,) indicating the generation of the failure wave. By using samples with different thickness but impacted at approximately the same shock stress of 3.9 GPa, the trajectory of the propagation of the failure wave through the stressed sample has been determined. The failure wave is generated with a delay time of about 0.5 mu s behind the shock wave front, and propagates into the stressed material with a velocity comparable to that of the shock wave front. A physical mechanism involving the "in situ activation and growth" of the originally existing micro-cracks due to the local shear stress under shock wave compression is suggested for these observations.

• 出版日期2007-1
• 单位中国工程物理研究院; 武汉理工大学; 中国工程物理研究院流体物理研究所