| Sensitivity Analysis, Determination and Optimization of Granite RHT Parameters |
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| 作者姓名： | Hongchao Li Yong Chen Dianshu Liu Lei Zhao Greg You |
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| 作者单位： | City College, Kunming University of Science and Technology, Kunming 650051, China,City College, Kunming University of Science and Technology, Kunming 650051, China,School of Mechanics & Civil Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China,Faculty of Science and Technology, Federation University Australia, University Drive, Mt Helen, Ballarat, Victoria 3353, Australia,Faculty of Science and Technology, Federation University Australia, University Drive, Mt Helen, Ballarat, Victoria 3353, Australia |
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| 基金项目： | Supported by the Talent Indroduction Research Start-up Fund Project of Kunming University of Science and Technology (KKSY201756009) |
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| 摘 要： | The RHT model has 34 parameters, among which 19 parameters can be obtained by experiments or theoretical calculations and the remaining 15 parameters are difficult to acquire. In this study, firstly, 10 Hopkinson impact tests were conducted to acquire the typical stress-strain curves of granite under dynamic loads. Through the sensitivity analysis, it is found that 13 of the 15 difficult-acquired parameters are effective to affect the shape of the stress-strain curve, and the other two parameters have no effect. Following the initial determination of model parameters with reference to the concrete RHT model, a new approach is proposed to optimize the 13 influential parameters through the LS-DYNA numerical simulation and orthogonal experiments. Finally, the determined granite RHT model parameters are verified by the results of Hopkinson impact tests conducted in this study and the bullet penetration test by Wang et al. Both results of the numerical simulations are in a good agreement with the tested results, which validates the suitability of the proposed method to acquire RHT model parameters for granite and the other rocks.
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| 关 键 词： | RHT model sensitivity analysis SHPB orthogonal experiment |
| 收稿时间： | 2018/4/20 0:00:00 |
Sensitivity Analysis, Determination and Optimization of Granite RHT Parameters |
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| Hongchao Li,Yong Chen,Dianshu Liu,Lei Zhao,Greg You.Sensitivity Analysis, Determination and Optimization of Granite RHT Parameters[J].Journal of Beijing Institute of Technology,2019,28(1):94-102. |
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| Authors: | Hongchao Li Yong Chen Dianshu Liu Lei Zhao and Greg You |
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| Abstract: | The RHT model has 34 parameters,among which 19 parameters can be obtained by experiments or theoretical calculations and the remaining 15 parameters are difficult to acquire.In this study,firstly,10 Hopkinson impact tests were conducted to acquire the typical stress-strain curves of granite under dynamic loads.Through the sensitivity analysis,it is found that 13 of the 15 difficult-acquired parameters are effective to affect the shape of the stress-strain curve,and the other two parameters have no effect.Following the initial determination of model parameters with reference to the concrete RHT model,a new approach is proposed to optimize the 13 influential parameters through the LS-DYNA numerical simulation and orthogonal experiments.Finally,the determined granite RHT model parameters are verified by the results of Hopkinson impact tests conducted in this study and the bullet penetration test by Wang et al.Both results of the numerical simulations are in a good agreement with the tested results,which validates the suitability of the proposed method to acquire RHT model parameters for granite and the other rocks. |
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| Keywords: | RHT model sensitivity analysis SHPB orthogonal experiment |
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