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Materials (Basel). 2016 May 17;9(5). pii: E377. doi: 10.3390/ma9050377.

Stress Wave Propagation in Viscoelastic-Plastic Rock-Like Materials.

Author information

1
Energy School, Xi'an University of Science and Technology, Xi'an 710054, China. csuliulang@163.com.
2
Key Laboratory of Western Mines and Hazards Prevention, Ministry of Education of China, Xi'an 710054, China. csuliulang@163.com.
3
Department of Civil Engineering, Inha University, Incheon 402-751, Korea. ksong@inha.ac.kr.
4
School of Geology Engineering and Geomatics, Changan University, Xi'an 710054, China. zy@chd.edu.cn.
5
School of Civil & Resource Engineering, University of Western Australia, Perth 6009, Australia. spring_xue@163.com.
6
Department of Civil Engineering, Inha University, Incheon 402-751, Korea. dwighthaward@naver.com.

Abstract

Rock-like materials are composites that can be regarded as a mixture composed of elastic, plastic, and viscous components. They exhibit viscoelastic-plastic behavior under a high-strain-rate loading according to element model theory. This paper presents an analytical solution for stress wave propagation in viscoelastic-plastic rock-like materials under a high-strain-rate loading and verifies the solution through an experimental test. A constitutive equation of viscoelastic-plastic rock-like materials was first established, and then kinematic and kinetic equations were then solved to derive the analytic solution for stress wave propagation in viscoelastic-plastic rock-like materials. An experimental test using the SHPB (Split Hopkinson Pressure Bar) for a concrete specimen was conducted to obtain a stress-strain curve under a high-strain-rate loading. Inverse analysis based on differential evolution was conducted to estimate undetermined variables for constitutive equations. Finally, the relationship between the attenuation factor and the strain rate in viscoelastic-plastic rock-like materials was investigated. According to the results, the frequency of the stress wave, viscosity coefficient, modulus of elasticity, and density play dominant roles in the attenuation of the stress wave. The attenuation decreases with increasing strain rate, demonstrating strongly strain-dependent attenuation in viscoelastic-plastic rock-like materials.

KEYWORDS:

SHPB apparatus; attenuation; constitutive equation; strain rate; stress wave equation; viscoelastic-plastic rock-like materials

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