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| Initiation and propagation of mode I crack under blasting |
| LIU Ruifeng1，2，ZHU Zheming1，2，LI Meng1，2，LIU Bang1，2 |
(1. MOE Key Laboratory Deep Underground Science and Engineering，Sichuan University，Chengdu，Sichuan 610065，China；
2. College of Architecture and Environment，Sichuan University，Chengdu，Sichuan 610065，China) |
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Abstract In order to study the parameters of fracture toughness and the propagation behavior of mode I crack under blasting loads，crack propagation gauges(CPGs) and single internal crack circular disc(SICCD) specimens were first applied in the tests of fracture toughness. The specimens of PMMA and the testing system of oscilloscope and ultra-dynamic strain amplifier were employed. Numerical models were established with the dynamic finite difference code AUTODYN and finite element code ABAQUS. The crack propagation velocity，dynamic initiation toughness，propagation toughness and fracture parameters of mode I crack were obtained through the experimental and numerical methods. The experimental results show that in the process of crack propagation，there is a cusp point on the propagation path and the phenomenon of crack arrest occurs at the cusp point. When the crack restarts to crack again，the speed will increase. CPGs monitor more accurately the propagation behavior of crack. The fracture toughness and other dynamic parameters were obtained with the experimental-numerical methods. The preliminary analysis shows that the dynamic crack arrest toughness is greater than the dynamic initiation toughness and the dynamic propagation toughness under blasting loads.
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2018, Vol. 37 
