Experimental study on granite and the determination of its true strain-rate effect
To accurately determine the true strain-rate effect of granite in split Hopkinson pressure bar (SHPB) tests, systematic experimental studies from quasi-static to dynamic loading on the same batch of granite samples is required. Therefore, firstly, splitting, uniaxial and triaxial compression tests w...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Marcílio Alves
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| Series: | Latin American Journal of Solids and Structures |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-78252015000400675&lng=en&tlng=en |
| _version_ | 1819152570312032256 |
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| author | Yong Cai Shuisheng Yu Yubin Lu |
| author_facet | Yong Cai Shuisheng Yu Yubin Lu |
| author_sort | Yong Cai |
| collection | DOAJ |
| description | To accurately determine the true strain-rate effect of granite in split Hopkinson pressure bar (SHPB) tests, systematic experimental studies from quasi-static to dynamic loading on the same batch of granite samples is required. Therefore, firstly, splitting, uniaxial and triaxial compression tests were used to study the mechanical response of granite under different static stress conditions with the MTS rock mechanics test system, and the impact compression tests were performed at different strain-rates by the split Hopkinson pressure bar (SHPB). The test results show that the compressive strength increases with the increase of confinement, but the increase rate decreases as the confinement gets larger. The axial failure strain also increases with the increase of confinement. Failure is related to the composition and structure of granite, as well as the stress state. With increasing confinement, the sample is more constrained, the elastic limit strain becomes smaller, and the elastic modulus becomes larger accordingly. In addition, shear slip failure takes place under triaxial compression. In the dynamic compression tests, the strain-rate affects not only the strength of granite, but also the degree of fragmentation and the breaking pattern. Also, it has been found that the dynamic compressive strength enhancement of rocks under impact loading is due to the combined effects of the material strain-rate, lateral inertia and end friction; however, in SHPB tests they are coupled together and could not be separated from each other. To determine the material strain-rate effect of rocks in the SHPB tests, the dynamic compressive strength enhancement caused by the lateral inertial effect and end friction effect needs to be removed. Assuming that the effect of the material strain-rate, lateral inertia and end friction is uncoupled, the numerical simulation method has been employed to simulate the SHPB tests on granite. The true strain-rate effect of granite in SHPB tests is thus determined. |
| first_indexed | 2024-12-22T14:51:23Z |
| format | Article |
| id | doaj.art-c2df597a41d34d348c39b0864137fb86 |
| institution | Directory Open Access Journal |
| issn | 1679-7825 |
| language | English |
| last_indexed | 2024-12-22T14:51:23Z |
| publisher | Marcílio Alves |
| record_format | Article |
| series | Latin American Journal of Solids and Structures |
| spelling | doaj.art-c2df597a41d34d348c39b0864137fb862022-12-21T18:22:19ZengMarcílio AlvesLatin American Journal of Solids and Structures1679-782512467569410.1590/1679-78251331S1679-78252015000400675Experimental study on granite and the determination of its true strain-rate effectYong CaiShuisheng YuYubin LuTo accurately determine the true strain-rate effect of granite in split Hopkinson pressure bar (SHPB) tests, systematic experimental studies from quasi-static to dynamic loading on the same batch of granite samples is required. Therefore, firstly, splitting, uniaxial and triaxial compression tests were used to study the mechanical response of granite under different static stress conditions with the MTS rock mechanics test system, and the impact compression tests were performed at different strain-rates by the split Hopkinson pressure bar (SHPB). The test results show that the compressive strength increases with the increase of confinement, but the increase rate decreases as the confinement gets larger. The axial failure strain also increases with the increase of confinement. Failure is related to the composition and structure of granite, as well as the stress state. With increasing confinement, the sample is more constrained, the elastic limit strain becomes smaller, and the elastic modulus becomes larger accordingly. In addition, shear slip failure takes place under triaxial compression. In the dynamic compression tests, the strain-rate affects not only the strength of granite, but also the degree of fragmentation and the breaking pattern. Also, it has been found that the dynamic compressive strength enhancement of rocks under impact loading is due to the combined effects of the material strain-rate, lateral inertia and end friction; however, in SHPB tests they are coupled together and could not be separated from each other. To determine the material strain-rate effect of rocks in the SHPB tests, the dynamic compressive strength enhancement caused by the lateral inertial effect and end friction effect needs to be removed. Assuming that the effect of the material strain-rate, lateral inertia and end friction is uncoupled, the numerical simulation method has been employed to simulate the SHPB tests on granite. The true strain-rate effect of granite in SHPB tests is thus determined.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-78252015000400675&lng=en&tlng=enGraniteconfinementstrain-rate effectlateral inertial effectend friction effectSHPB test damage toleranceWeibull distribution |
| spellingShingle | Yong Cai Shuisheng Yu Yubin Lu Experimental study on granite and the determination of its true strain-rate effect Latin American Journal of Solids and Structures Granite confinement strain-rate effect lateral inertial effect end friction effect SHPB test damage tolerance Weibull distribution |
| title | Experimental study on granite and the determination of its true strain-rate effect |
| title_full | Experimental study on granite and the determination of its true strain-rate effect |
| title_fullStr | Experimental study on granite and the determination of its true strain-rate effect |
| title_full_unstemmed | Experimental study on granite and the determination of its true strain-rate effect |
| title_short | Experimental study on granite and the determination of its true strain-rate effect |
| title_sort | experimental study on granite and the determination of its true strain rate effect |
| topic | Granite confinement strain-rate effect lateral inertial effect end friction effect SHPB test damage tolerance Weibull distribution |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-78252015000400675&lng=en&tlng=en |
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