Numerical modelling of dynamic spalling test on rock with an emphasis on the influence of pre-existing cracks
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This article deals with numerical modeling of rock fracture under dynamic tensile loading and the related prediction of dynamic tensile strength. A special emphasis is laid on the inﬂuence of pre-existing natural microcrack populations as well as structural (artiﬁcial) cracks. For this end, a previously developed 3D continuum viscodamage-embedded discontinuity model is employed in the explicit dynamic ﬁnite element simulations of the spalling test. This model is capable of modelling the eﬀect of natural microcracks populations always present in rocks as well as to capture the strain rate hardening eﬀect of quasi-brittle materials. In the numerical simulations of spalling test on Bohus granite, it is shown that the model can predict the pull-pack velocity of the free end of the intact rock sample and the eﬀect of structural cracks with a good accuracy. According to the simulations, the eﬀect of microcrack populations, modeled here as pre-embedded discontinuity populations, is weaker than the corresponding eﬀect under quasi-static loading.
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