- Title
- Sensitivity analysis, determination and optimization of granite RHT parameters
- Creator
- Li, Hongchao; Chen, Yong; Liu, Dianshu; Zhao, Lei; You, Greg
- Date
- 2019
- Type
- Text; Journal article
- Identifier
- http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/169934
- Identifier
- vital:14085
- Identifier
-
https://doi.org/10.15918/j.jbit1004-0579.18083
- Identifier
- ISBN:1004-0579
- 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 difficultacquired 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.
- Publisher
- Beijing Institute of Technology
- Relation
- Journal of Beijing Institute of Technology (English Edition) Vol. 28, no. 1 (2019), p. 94-102
- Rights
- Copyright © 2019 Editorial Department of Journal of Beijing Institute of Technology.
- Rights
- This metadata is freely available under a CCO license
- Subject
- Orthogonal experiment; RHT model; Sensitivity analysis; SHPB
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