Mechanical properties and fracture surface roughness of thermally damaged granite under dynamic splitting
Abstract In order to understand the mechanical properties and the fracture surface roughness characteristics of thermally damaged granite under dynamic splitting, dynamic Brazilian splitting tests were conducted on granite samples after thermal treatment at 25, 200, 400, and 600°C. Results show that...
| Главные авторы: | , , , |
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| Формат: | Статья |
| Язык: | English |
| Опубликовано: |
Wiley
2024-03-01
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| Серии: | Deep Underground Science and Engineering |
| Предметы: | |
| Online-ссылка: | https://doi.org/10.1002/dug2.12065 |
| _version_ | 1827307600661708800 |
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| author | Yijin Qian Peng Jia Songze Mao Jialiang Lu |
| author_facet | Yijin Qian Peng Jia Songze Mao Jialiang Lu |
| author_sort | Yijin Qian |
| collection | DOAJ |
| description | Abstract In order to understand the mechanical properties and the fracture surface roughness characteristics of thermally damaged granite under dynamic splitting, dynamic Brazilian splitting tests were conducted on granite samples after thermal treatment at 25, 200, 400, and 600°C. Results show that the dynamic peak splitting strength of thermally damaged granite samples increases with increasing strain rate, showing obvious strain‐rate sensitivity. With increasing temperature, thermally induced cracks in granite transform from intergranular cracks to intragranular cracks, and to a transgranular crack network. Thermally induced damages reduce the dynamic peak splitting strength and the maximum absorbed energy while increasing the peak radial strain. The fracture mode of the thermally damaged granite under dynamic loads is mode II splitting failure. By using the axial roughness index Z 2 a, the distribution ranges of the wedge‐shaped failure zones and the tensile failure zones in the fracture surfaces under dynamic Brazilian splitting can be effectively identified. The radial roughness index Z 2 r is sensitive to the strain rate and temperature. It shows a linear correlation with the peak splitting strength and the maximum absorbed energy and a linear negative correlation with the peak radial strain. Z 2 r can be used to quantitatively estimate the dynamic parameters based on the models proposed. |
| first_indexed | 2024-04-24T18:41:51Z |
| format | Article |
| id | doaj.art-3fd85c5fd4d54af9b3a62f20ef28f6c2 |
| institution | Directory Open Access Journal |
| issn | 2097-0668 2770-1328 |
| language | English |
| last_indexed | 2024-04-24T18:41:51Z |
| publishDate | 2024-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Deep Underground Science and Engineering |
| spelling | doaj.art-3fd85c5fd4d54af9b3a62f20ef28f6c22024-03-27T10:29:49ZengWileyDeep Underground Science and Engineering2097-06682770-13282024-03-013110311610.1002/dug2.12065Mechanical properties and fracture surface roughness of thermally damaged granite under dynamic splittingYijin Qian0Peng Jia1Songze Mao2Jialiang Lu3School of Resources and Civil Engineering Northeastern University Shenyang ChinaSchool of Resources and Civil Engineering Northeastern University Shenyang ChinaSchool of Resources and Civil Engineering Northeastern University Shenyang ChinaSchool of Resources and Civil Engineering Northeastern University Shenyang ChinaAbstract In order to understand the mechanical properties and the fracture surface roughness characteristics of thermally damaged granite under dynamic splitting, dynamic Brazilian splitting tests were conducted on granite samples after thermal treatment at 25, 200, 400, and 600°C. Results show that the dynamic peak splitting strength of thermally damaged granite samples increases with increasing strain rate, showing obvious strain‐rate sensitivity. With increasing temperature, thermally induced cracks in granite transform from intergranular cracks to intragranular cracks, and to a transgranular crack network. Thermally induced damages reduce the dynamic peak splitting strength and the maximum absorbed energy while increasing the peak radial strain. The fracture mode of the thermally damaged granite under dynamic loads is mode II splitting failure. By using the axial roughness index Z 2 a, the distribution ranges of the wedge‐shaped failure zones and the tensile failure zones in the fracture surfaces under dynamic Brazilian splitting can be effectively identified. The radial roughness index Z 2 r is sensitive to the strain rate and temperature. It shows a linear correlation with the peak splitting strength and the maximum absorbed energy and a linear negative correlation with the peak radial strain. Z 2 r can be used to quantitatively estimate the dynamic parameters based on the models proposed.https://doi.org/10.1002/dug2.12065dynamic splittingfracture surface roughnessgranitestrain ratethermal treatment |
| spellingShingle | Yijin Qian Peng Jia Songze Mao Jialiang Lu Mechanical properties and fracture surface roughness of thermally damaged granite under dynamic splitting Deep Underground Science and Engineering dynamic splitting fracture surface roughness granite strain rate thermal treatment |
| title | Mechanical properties and fracture surface roughness of thermally damaged granite under dynamic splitting |
| title_full | Mechanical properties and fracture surface roughness of thermally damaged granite under dynamic splitting |
| title_fullStr | Mechanical properties and fracture surface roughness of thermally damaged granite under dynamic splitting |
| title_full_unstemmed | Mechanical properties and fracture surface roughness of thermally damaged granite under dynamic splitting |
| title_short | Mechanical properties and fracture surface roughness of thermally damaged granite under dynamic splitting |
| title_sort | mechanical properties and fracture surface roughness of thermally damaged granite under dynamic splitting |
| topic | dynamic splitting fracture surface roughness granite strain rate thermal treatment |
| url | https://doi.org/10.1002/dug2.12065 |
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