Fracture processes of rocks in dynamic tensile-splitting test

Cho, S.; Mohanty, B.; Nakamura, Yuki; Ogata, Yoichi; Kitayama, H.; Kaneko, Katsuhiko

doi:10.1201/noe0415444019-c78

Cited by 5 publications

(1 citation statement)

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“…Split Hopkinson pressure bars (SHPB) technique is one of widely used apparatuses to investigate the strain rate dependency of material properties [1]. SHPB techniques allow relatively uniform deformation conditions with very high strain rates in uni-axial compression tests [2][3][4][5]. The strain rate dependencies of strength of rock materials were applied to determination of constitutive model parameters required for numerical simulations of impact penetrating and blast fracturing.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of the dynamic failure behavior of rock materials subjected to various impact loads

Kang¹,

Kang²,

Kim³

et al. 2014

WIT Transactions on the Built Environment

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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.

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Section: Introductionmentioning

confidence: 99%