Study on Dynamic Mechanical Properties and Damage Evolution Model of Siltstone
This paper is focused on exploring the dynamic mechanical properties and damage process of siltstone. For this purpose, different stress wave wavelengths (0.5 m∼2.0 m) and different strain rates (25 s−1∼120 s−1) were applied to siltstone specimens in the SHPB dynamic impact test. The experimental re...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2019/5174579 |
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| _version_ | 1849691114690314240 |
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| author | Guoliang Zhang Haipeng Jia Shuaifeng Wu |
| author_facet | Guoliang Zhang Haipeng Jia Shuaifeng Wu |
| author_sort | Guoliang Zhang |
| collection | DOAJ |
| description | This paper is focused on exploring the dynamic mechanical properties and damage process of siltstone. For this purpose, different stress wave wavelengths (0.5 m∼2.0 m) and different strain rates (25 s−1∼120 s−1) were applied to siltstone specimens in the SHPB dynamic impact test. The experimental results show that the dynamic compressive strength of siltstone is linearly positively correlated with the strain rate, and the dynamic increase factor is linearly positively correlated with the natural logarithm of strain rate; the peak strain is linearly positively correlated with the strain rate, and the increase in wavelength causes the peak strain to increase. Through multiple impact tests, it is concluded that the cumulative damage to siltstone increases with the number of impacts. The cumulative damage curve exhibits an initial rapid rise, followed by a stable development, followed by another rapid rise. With increasing wavelength of the stress wave, the stable development of the curve gradually decreases, the cumulative damage to the siltstone is intensified, and the number of repeated impacts is reduced. Meanwhile, a model for damage evolution is established based on the inverse of the Gompertz function, and the physical meanings of the model parameters are determined. The model can reflect the influence of both stress wave parameters and impact times. Verification of the model demonstrates the rationality of the model and the correctness of the physical meaning of the parameters. The model could be applied in future studies of damage to sedimentary rocks. |
| format | Article |
| id | doaj-art-e967b4acdaca4b8c97e956ae76f55bf1 |
| institution | DOAJ |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-e967b4acdaca4b8c97e956ae76f55bf12025-08-20T03:21:08ZengWileyShock and Vibration1070-96221875-92032019-01-01201910.1155/2019/51745795174579Study on Dynamic Mechanical Properties and Damage Evolution Model of SiltstoneGuoliang Zhang0Haipeng Jia1Shuaifeng Wu2School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, ChinaState Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, ChinaThis paper is focused on exploring the dynamic mechanical properties and damage process of siltstone. For this purpose, different stress wave wavelengths (0.5 m∼2.0 m) and different strain rates (25 s−1∼120 s−1) were applied to siltstone specimens in the SHPB dynamic impact test. The experimental results show that the dynamic compressive strength of siltstone is linearly positively correlated with the strain rate, and the dynamic increase factor is linearly positively correlated with the natural logarithm of strain rate; the peak strain is linearly positively correlated with the strain rate, and the increase in wavelength causes the peak strain to increase. Through multiple impact tests, it is concluded that the cumulative damage to siltstone increases with the number of impacts. The cumulative damage curve exhibits an initial rapid rise, followed by a stable development, followed by another rapid rise. With increasing wavelength of the stress wave, the stable development of the curve gradually decreases, the cumulative damage to the siltstone is intensified, and the number of repeated impacts is reduced. Meanwhile, a model for damage evolution is established based on the inverse of the Gompertz function, and the physical meanings of the model parameters are determined. The model can reflect the influence of both stress wave parameters and impact times. Verification of the model demonstrates the rationality of the model and the correctness of the physical meaning of the parameters. The model could be applied in future studies of damage to sedimentary rocks.http://dx.doi.org/10.1155/2019/5174579 |
| spellingShingle | Guoliang Zhang Haipeng Jia Shuaifeng Wu Study on Dynamic Mechanical Properties and Damage Evolution Model of Siltstone Shock and Vibration |
| title | Study on Dynamic Mechanical Properties and Damage Evolution Model of Siltstone |
| title_full | Study on Dynamic Mechanical Properties and Damage Evolution Model of Siltstone |
| title_fullStr | Study on Dynamic Mechanical Properties and Damage Evolution Model of Siltstone |
| title_full_unstemmed | Study on Dynamic Mechanical Properties and Damage Evolution Model of Siltstone |
| title_short | Study on Dynamic Mechanical Properties and Damage Evolution Model of Siltstone |
| title_sort | study on dynamic mechanical properties and damage evolution model of siltstone |
| url | http://dx.doi.org/10.1155/2019/5174579 |
| work_keys_str_mv | AT guoliangzhang studyondynamicmechanicalpropertiesanddamageevolutionmodelofsiltstone AT haipengjia studyondynamicmechanicalpropertiesanddamageevolutionmodelofsiltstone AT shuaifengwu studyondynamicmechanicalpropertiesanddamageevolutionmodelofsiltstone |