The effect of a pre‐existing crack on a running crack in brittle material under dynamic loads

• DOI: 10.1111/ffe.13105
• Publication Date: 2019-07-23T09:50:42Z
• Authors: Qin Zhou; Zheming Zhu; Xiong Wang; Jiali Zhou; Lin Lang; Xianshang Zhang
• Keywords: Brittleness

Abstract Brittle material usually contains plenty of cracks or micro‐cracks, which raises a question that how pre‐existing crack affects running as they are approaching. In order to investigate such issue, impact experiments were conducted by using double semi‐circle (DCSC) specimens. Polymethyl methacrylate (PMMA) was selected make the DCSC specimens, and modified SHPB system used perform tests. The finite difference code AUTODYN employed simulate propagation behavior path, simulated paths agree well with test results. Meanwhile stresses around tips analyzed direction investigated. To calculate dynamic stress intensity factors (DSIFs), element ABAQUS employed. results show spacing D between vertical tip inclined center distribution fracture largely. As approaches crack, speed is slow down, tensile appears at tip. small than 50 mm, connects middle area crack. either upper larger coalesces