Tensile Strength Test of Rock at High Strain Rate Using Digital Image Correlation
Tei Saburi, Yoshiaki Takahashi, Shiro Kubota, Yuji Ogata
download PDFAbstract. 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.
Keywords
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.
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