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Stress Wave Propagation in Viscoelastic-Plastic Rock-Like Materials
Liu Lang1,2, Ki-Il Song3, Yue Zhai4
1Energy School, Xi'an University of Science and Technology, Xi'an 710054, China. csuliulang@163.com.
Materials (Basel, Switzerland)
|August 5, 2017
Summary
This study presents an analytical solution for stress wave propagation in viscoelastic-plastic rock-like materials. The research confirms that stress wave attenuation in these materials is strain-dependent and influenced by material properties.
Area of Science:
- Materials Science
- Solid Mechanics
- Geophysics
Background:
- Rock-like materials exhibit complex viscoelastic-plastic behavior under high strain rates.
- Understanding stress wave propagation is crucial for analyzing material response in dynamic scenarios.
Purpose of the Study:
- To develop an analytical solution for stress wave propagation in viscoelastic-plastic rock-like materials.
- To experimentally validate the derived analytical solution.
- To investigate the strain rate dependency of stress wave attenuation.
Main Methods:
- Establishment of a constitutive equation for viscoelastic-plastic rock-like materials.
- Derivation of analytical solutions for kinematic and kinetic equations governing stress wave propagation.
- Experimental validation using Split Hopkinson Pressure Bar (SHPB) tests on concrete specimens.
- Inverse analysis employing differential evolution to determine material parameters.
Main Results:
- An analytical solution for stress wave propagation was successfully derived and validated.
- Experimental data from SHPB tests provided stress-strain curves under high strain rates.
- Key factors influencing stress wave attenuation include wave frequency, viscosity, elastic modulus, and density.
- Stress wave attenuation was found to decrease with increasing strain rate.
Conclusions:
- The developed analytical model accurately describes stress wave propagation in viscoelastic-plastic rock-like materials.
- Material properties significantly impact stress wave attenuation.
- The study highlights the pronounced strain-dependent nature of attenuation in these materials.
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