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Dynamic Split Tensile Strength of Basalt, Granite, Marble and Sandstone: Strain Rate Dependency and Fragmentation
https://orcid.org/0000-0002-0047-5642
Abstract The aim of this study is to understand the strength behaviour and fragment size of rocks during indirect, quasi-static and dynamic tensile tests. Four rocks with different lithological characteristics, namely: basalt, granite, sandstone, and marble were selected for this study. Brazilian disc experiments were performed over a range of strain rates from ~ $ 10^{–5} $ /s to 2.7 × $ 10^{1} $ /s using a hydraulic loading frame and a split Hopkinson bar. Over the range of strain rates, our measurements of dynamic strength increase are in good agreement with the universal theoretical scaling relationship of (Kimberley et al., Acta Mater 61:3509–3521, 2013). Dynamic fragmentation during split tension mode failure has received little attention, and in the present study, we determine the fragment size distribution based on the experimentally fragmented specimens. The fragments fall into two distinct groups based on the nature of failure: coarser primary fragments, and finer secondary fragments. The degree of fragmentation is assessed in terms of characteristic strain rate and is compared with existing theoretical tensile fragmentation models. The average size of the secondary fragments has a strong strain rate dependency over the entire testing range, while the primary fragment size is less sensitive at lower strain rates. Marble and sandstone are found to generate more pulverised secondary debris when compared to basalt and granite. Furthermore, the mean fragment sizes of primary and secondary fragments are well described by a power-law function of strain rate.
Highlights Dynamic tensile strength of the rocks are experimentally observed to obey the universal theoretical scaling relationship proposed by Kimberley et al.Dilatancy occurred directly from the start of loading for saturated coal due to regional overpressure.Primary (coarse) and secondary (fine) fragments size generated from the split tensile tests are represented by a power-law function of strain rate.The mean fragment size of primary fragments is less sensitive to strain rate, while the secondary fragments have a strong strain rate dependency.
Dynamic Split Tensile Strength of Basalt, Granite, Marble and Sandstone: Strain Rate Dependency and Fragmentation
https://orcid.org/0000-0002-0047-5642
Abstract The aim of this study is to understand the strength behaviour and fragment size of rocks during indirect, quasi-static and dynamic tensile tests. Four rocks with different lithological characteristics, namely: basalt, granite, sandstone, and marble were selected for this study. Brazilian disc experiments were performed over a range of strain rates from ~ $ 10^{–5} $ /s to 2.7 × $ 10^{1} $ /s using a hydraulic loading frame and a split Hopkinson bar. Over the range of strain rates, our measurements of dynamic strength increase are in good agreement with the universal theoretical scaling relationship of (Kimberley et al., Acta Mater 61:3509–3521, 2013). Dynamic fragmentation during split tension mode failure has received little attention, and in the present study, we determine the fragment size distribution based on the experimentally fragmented specimens. The fragments fall into two distinct groups based on the nature of failure: coarser primary fragments, and finer secondary fragments. The degree of fragmentation is assessed in terms of characteristic strain rate and is compared with existing theoretical tensile fragmentation models. The average size of the secondary fragments has a strong strain rate dependency over the entire testing range, while the primary fragment size is less sensitive at lower strain rates. Marble and sandstone are found to generate more pulverised secondary debris when compared to basalt and granite. Furthermore, the mean fragment sizes of primary and secondary fragments are well described by a power-law function of strain rate.
Highlights Dynamic tensile strength of the rocks are experimentally observed to obey the universal theoretical scaling relationship proposed by Kimberley et al.Dilatancy occurred directly from the start of loading for saturated coal due to regional overpressure.Primary (coarse) and secondary (fine) fragments size generated from the split tensile tests are represented by a power-law function of strain rate.The mean fragment size of primary fragments is less sensitive to strain rate, while the secondary fragments have a strong strain rate dependency.
Dynamic Split Tensile Strength of Basalt, Granite, Marble and Sandstone: Strain Rate Dependency and Fragmentation
https://orcid.org/0000-0002-0047-5642
Abstract The aim of this study is to understand the strength behaviour and fragment size of rocks during indirect, quasi-static and dynamic tensile tests. Four rocks with different lithological characteristics, namely: basalt, granite, sandstone, and marble were selected for this study. Brazilian disc experiments were performed over a range of strain rates from ~ $ 10^{–5} $ /s to 2.7 × $ 10^{1} $ /s using a hydraulic loading frame and a split Hopkinson bar. Over the range of strain rates, our measurements of dynamic strength increase are in good agreement with the universal theoretical scaling relationship of (Kimberley et al., Acta Mater 61:3509–3521, 2013). Dynamic fragmentation during split tension mode failure has received little attention, and in the present study, we determine the fragment size distribution based on the experimentally fragmented specimens. The fragments fall into two distinct groups based on the nature of failure: coarser primary fragments, and finer secondary fragments. The degree of fragmentation is assessed in terms of characteristic strain rate and is compared with existing theoretical tensile fragmentation models. The average size of the secondary fragments has a strong strain rate dependency over the entire testing range, while the primary fragment size is less sensitive at lower strain rates. Marble and sandstone are found to generate more pulverised secondary debris when compared to basalt and granite. Furthermore, the mean fragment sizes of primary and secondary fragments are well described by a power-law function of strain rate.
Highlights Dynamic tensile strength of the rocks are experimentally observed to obey the universal theoretical scaling relationship proposed by Kimberley et al.Dilatancy occurred directly from the start of loading for saturated coal due to regional overpressure.Primary (coarse) and secondary (fine) fragments size generated from the split tensile tests are represented by a power-law function of strain rate.The mean fragment size of primary fragments is less sensitive to strain rate, while the secondary fragments have a strong strain rate dependency.
Dynamic Split Tensile Strength of Basalt, Granite, Marble and Sandstone: Strain Rate Dependency and Fragmentation
Padmanabha, Vivek (author) / Schäfer, Frank (author) / Rae, Auriol S. P. (author) / Kenkmann, Thomas (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
| British Library Online Contents | 2014
Study on the Strain Rate Dependency of the Tensile Strength of Rock
| British Library Conference Proceedings | 2002