The Microcrack Shape of Spallation and Characteristics of Spalling Level

Dong Yanjin, Ye Ning, Han Wensheng
(Laboratory for Nonlinear Mechanics of Continuous Media Institute of Mechanics, Chinese Academy of Sciences Beijing 100080)

£Ábstract: Spallation is a typical mode of impact damage and fracture of materials. This paper reported that by using Ultrasonic C Scanning System, the shape of microcracks was found to be like penny based upon the detecting results of Ultrasonic System. Moreover, based upon the penny shape of microcracks and analysis of evolution process of microcracks, a non-dimensional parameter describing the spallation was proposed. Comparison with the experimental results illustrates that this parameter is appropriate for characterizing spallation.
Keywords: spallation, microcrack shape, c-scanning test , characteristics of spalling level.