Experimental And Numerical Study Of The
Dynamic Failure Behavior Of Rock Materials
Subjected To Various Impact Loads
Author(s)
H. M. Kang, M. S. Kang, M. S. Kim, H. K. Kwak, L. J. Park
& S. H. Cho
Abstract
An understanding of the effect of strain rate on the dynamic failure and
mechanical properties of rock materials is important in the design of rock
structures against missile impact or the penetration analysis of projectiles into
rock mass. In this study, a pulse shape-controlled Split Hopkinson Pressure Bar
system was used to impact rock materials. The impact velocity of the impact bar
had been increased to 5m/sec from 30m/sec and complete compressive stressstrain
curves were obtained to investigate the effect of strain rate on the dynamic
failure of the rock materials. The micro-focus X-ray computerized tomography
was used to scan the tested samples and the failure process of rock materials
were discussed. The numerical simulations on SHPB tests of rock materials were
carried out with the explicit finite element software ANSYS LS-DYNA. The
incident stress waveforms obtained from the SHPB test are directly applied to
the input into the end side of the incident bar. The numerical stress-strain curves
are compared with the experimental curves with a different strain rate.
Keywords: limestone, dynamic fracture behavior, SHPB, X-Ray CT, LS-DYNA,
JHC model.
Keywords
limestone, dynamic fracture behavior, SHPB, X-Ray CT, LS-DYNA,
JHC model.
Related Book
Other papers in this volume
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