Tensile Strength Test of Rock at High Strain Rate Using Digital Image Correlation

Tensile Strength Test of Rock at High Strain Rate Using Digital Image Correlation

Tei Saburi, Yoshiaki Takahashi, Shiro Kubota, Yuji Ogata

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Abstract. Tensile strength test of rock at high strain rate was experimentally performed by utilizing the nature of the strength difference. A magnitude of the tensile strength of brittle materials such as rock is much smaller than that of compressive strength. A compressive wave was produced by dynamic loading of explosive charge and made incident on a one end of a rock specimen bar. The compressive wave traveled through the specimen bar and it reflected at the free surface of the opposite end as a tensile wave with reversal amplitude. The tensile wave will cause the spall failure of the specimen at a specific distance from the free surface where the superposition of tensile and compressive waves exceeds the tensile failure strength of the specimen, usually referred to as Hopkinson effect. The dynamic behavior was observed at the side face of the bar specimen using a high-speed video camera, and the captured images were used to analyze the surface displacement behavior using a digital image correlation (DIC) technique. Strain and strain rate distributions on the specimen bar during impact loading were evaluated. The relationship between strain rate and dynamic tensile strength was discussed.

Tensile Strength, High Strain Rate, Blast Loading, Rock Fracture, Hopkinson Effect, Digital Image Correlation

Published online 7/30/2019, 6 pages
Copyright © 2019 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: Tei Saburi, Yoshiaki Takahashi, Shiro Kubota, Yuji Ogata, Tensile Strength Test of Rock at High Strain Rate Using Digital Image Correlation, Materials Research Proceedings, Vol. 13, pp 97-102, 2019

DOI: https://doi.org/10.21741/9781644900338-17

The article was published as article 17 of the book Explosion Shock Waves and High Strain Rate Phenomena

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

[1] C. A. Ross, J. W. Tedesco, S. T. Kuennen, Effects of strain rate on Concrete Strength, ACI Mat. J., 92 (1995) 37-47.
[2] Z. Zhou, X. Li, Z. Ye, K. Liu, Obtaining Constitutive Relationship for Rate-Dependent Rock in SHPB Tests, Rock Mech. Rock Eng., 43 (2010) 697-706. https://doi.org/10.1007/s00603-010-0096-3
[3] Q. B. Zhang, J.Zhao, A Review of Dynamic Experimental Techniques and Mechanical Behaviour of Rock Materials, Rock Mech. Rock Eng., 47 (2014) 1411-1478. https://doi.org/10.1007/s00603-013-0463-y
[4] S. Huang, R. Chen, K. W. Xia, Quantification of dynamic tensile parameters of rocks using a modified Kolsky tension bar apparatus, J. Rock Mech. Geotech. Eng., 2 (2010) 162-168. https://doi.org/10.3724/sp.j.1235.2010.00162
[5] ASTM, Standard Test Method for Splitting Tensile Strength of Intact Rock Core Specimens, ASTM D3967-08, (2008). https://doi.org/10.1520/d3967-95ar01
[6] ISRM, Suggested methods for determining tensile strength of rock materials, Int. J. Rock Mech. Min. Sci. Geomech. Abstr., 15 (1978) 99-103.
[7] M. A. Sutton, J. J. Orteu, H. W. Schreier, Image correlation for shape, motion and deformation measurements, Springer (2009). https://doi.org/10.1007/978-0-387-78747-3
[8] SH. Cho, Y. Ogata, K. Kaneko, Strain-rate dependence of the dynamic tensile strength of rock, Int. J. Rock Mech. Min. Sc., 40 (2003) 763-777.
[9] S. Kubota, Y. Ogata, Y. Wada, G.Simangunsong, H. Shimada, K. Matsui, Estimation of dynamic tensile strength of sandstone, Int. J. Rock Mech. Min. Sc., 45 (2008) 397-406. https://doi.org/10.1016/j.ijrmms.2007.07.003