Dynamic Mechanical Properties and Damage Evolution Characteristics of Beishan Deep Granite under Medium and High Strain Rates
To study the dynamic mechanical properties and damage evolution mechanism of Beishan deep granite under medium and high strain rates, dynamic mechanical tests for the deep granite specimens with different strain rates were conducted using the split Hopkinson pressure bar (SHPB) device. The improved...
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MDPI AG
2023-07-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/16/15/5235 |
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| author | Hui Lu Yue Pan Kang He Fei Wang Lei Gao Shikun Pu Erbing Li |
| author_facet | Hui Lu Yue Pan Kang He Fei Wang Lei Gao Shikun Pu Erbing Li |
| author_sort | Hui Lu |
| collection | DOAJ |
| description | To study the dynamic mechanical properties and damage evolution mechanism of Beishan deep granite under medium and high strain rates, dynamic mechanical tests for the deep granite specimens with different strain rates were conducted using the split Hopkinson pressure bar (SHPB) device. The improved Zhu–Wang–ang (ZWT) dynamic constitutive model was established, and the relationship between strain rate and strain energy was investigated. The test results show that the strain rate in the dynamic load test is closer to the strain rate in the rock blasting state when the uniaxial SHPB test is applied to the granite specimens in a low ground stress state. Peak stress has a linear correlation with strain rate, and the dynamic deformation modulus of the Beishan granite is 152.58 GPa. The dissipation energy per unit volume and the energy ratio increase along with the strain rate, whereas the dissipation energy per unit volume increases exponentially along with the strain rate. There is a consistent relationship between the damage degree of granite specimens and the dissipation energy per unit volume, which correspond to one another, but there is no one-to-one correspondence between the damage degree of granite specimens and the strain rate. To consider the damage and obtain the damage discount factor for the principal structure model, the principal structure of the element combination model was improved and simplified using the ZWT dynamic constitutive model. The change of damage parameters with strain rate and strain was obtained, and the dynamic damage evolution equation of Beishan granite was established by considering the damage threshold. |
| first_indexed | 2024-03-11T00:23:28Z |
| format | Article |
| id | doaj.art-7a445769cdcd466aa2d1425c1ca8081c |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T00:23:28Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-7a445769cdcd466aa2d1425c1ca8081c2023-11-18T23:10:37ZengMDPI AGMaterials1996-19442023-07-011615523510.3390/ma16155235Dynamic Mechanical Properties and Damage Evolution Characteristics of Beishan Deep Granite under Medium and High Strain RatesHui Lu0Yue Pan1Kang He2Fei Wang3Lei Gao4Shikun Pu5Erbing Li6College of Field Engineering, Army Engineering University of PLA, Nanjing 210007, ChinaCollege of Transportation Engineering, Tongji University, Shanghai 200092, ChinaCollege of Defense Engineering, Army Engineering University of PLA, Nanjing 210007, ChinaCollege of Defense Engineering, Army Engineering University of PLA, Nanjing 210007, ChinaCollege of Defense Engineering, Army Engineering University of PLA, Nanjing 210007, ChinaCollege of Defense Engineering, Army Engineering University of PLA, Nanjing 210007, ChinaCollege of Defense Engineering, Army Engineering University of PLA, Nanjing 210007, ChinaTo study the dynamic mechanical properties and damage evolution mechanism of Beishan deep granite under medium and high strain rates, dynamic mechanical tests for the deep granite specimens with different strain rates were conducted using the split Hopkinson pressure bar (SHPB) device. The improved Zhu–Wang–ang (ZWT) dynamic constitutive model was established, and the relationship between strain rate and strain energy was investigated. The test results show that the strain rate in the dynamic load test is closer to the strain rate in the rock blasting state when the uniaxial SHPB test is applied to the granite specimens in a low ground stress state. Peak stress has a linear correlation with strain rate, and the dynamic deformation modulus of the Beishan granite is 152.58 GPa. The dissipation energy per unit volume and the energy ratio increase along with the strain rate, whereas the dissipation energy per unit volume increases exponentially along with the strain rate. There is a consistent relationship between the damage degree of granite specimens and the dissipation energy per unit volume, which correspond to one another, but there is no one-to-one correspondence between the damage degree of granite specimens and the strain rate. To consider the damage and obtain the damage discount factor for the principal structure model, the principal structure of the element combination model was improved and simplified using the ZWT dynamic constitutive model. The change of damage parameters with strain rate and strain was obtained, and the dynamic damage evolution equation of Beishan granite was established by considering the damage threshold.https://www.mdpi.com/1996-1944/16/15/5235Beishan deep granitemedium and high strain ratesSHPBenergy dissipationdamage evolution mechanism |
| spellingShingle | Hui Lu Yue Pan Kang He Fei Wang Lei Gao Shikun Pu Erbing Li Dynamic Mechanical Properties and Damage Evolution Characteristics of Beishan Deep Granite under Medium and High Strain Rates Materials Beishan deep granite medium and high strain rates SHPB energy dissipation damage evolution mechanism |
| title | Dynamic Mechanical Properties and Damage Evolution Characteristics of Beishan Deep Granite under Medium and High Strain Rates |
| title_full | Dynamic Mechanical Properties and Damage Evolution Characteristics of Beishan Deep Granite under Medium and High Strain Rates |
| title_fullStr | Dynamic Mechanical Properties and Damage Evolution Characteristics of Beishan Deep Granite under Medium and High Strain Rates |
| title_full_unstemmed | Dynamic Mechanical Properties and Damage Evolution Characteristics of Beishan Deep Granite under Medium and High Strain Rates |
| title_short | Dynamic Mechanical Properties and Damage Evolution Characteristics of Beishan Deep Granite under Medium and High Strain Rates |
| title_sort | dynamic mechanical properties and damage evolution characteristics of beishan deep granite under medium and high strain rates |
| topic | Beishan deep granite medium and high strain rates SHPB energy dissipation damage evolution mechanism |
| url | https://www.mdpi.com/1996-1944/16/15/5235 |
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