A Method for Testing Dynamic Tensile Strength and Elastic Modulus of Rock Materials Using SHPB |
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Authors: | Q Z Wang W Li X L Song |
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Institution: | (1) Department of Civil Engineering and Applied Mechanics, Sichuan University, Chengdu, Sichuan, 610065, China |
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Abstract: | An experimental procedure for testing dynamic tensile strength and elastic modulus of rock materials at high strain rate loading
is presented in this paper. In our test the split Hopkinson pressure bar (SHPB) was used to diametrally impact the Brazilian
disc (BD) and flattened Brazilian disc (FBD) specimens of marble. A tensile strain rate of about 45 1/s was achieved at the
center of the specimen. In order to improve the accuracy of the analysis, the initiation time difference between the strain
waves acting on the two flat ends of the FBD specimen was treated properly. Typical failure modes corresponding to different
loading conditions were observed. It was verified with a finite-element simulation that the equilibrium condition was established
in the specimen before its failure. This numerical simulation validates the experimental procedure and also proves the suitability
of formulation for the basic equations. |
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Keywords: | Flattened Brazilian disc dynamic splitting test dynamic tensile strength dynamic elastic modulus split Hopkinson pressure bar (SHPB) rock |
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