Techno Press
Techno Press

Structural Engineering and Mechanics   Volume 11, Number 4, April 2001, pages 407-422
Stress wave propagation in composite materials
Siyuan J. Shen, Jens C. Pfister and James D. Lee(U.S.A.)

Abstract     [Full Text]
    The linear constitutive relations and the failure criteria of composite materials made of
thermoviscoelastic solids are presented. The post-failure material behavior is proposed and the dynamic
finite element equations are formulated. However, a nonlinear term is kept in the energy equation because
it represents the effect of the second law of thermodynamics. A general purpose nonlinear three-dimensional
dynamic finite element program COMPASS is upgraded and employed in this work to investigate the
interdependence among stress wave propagation, stress concentration, failure progression and temperature
elevation in composite materials. The consequence of truthfully incorporating the second law of thermodynamics is
clearly observed: it will always cause temperature rise if there exists a dynamic mechanical process.
Key Words
    dynamic finite element analysis; second law of thermodynamics; thermo-mechanical coupling; thermoviscoelasticity; composite materials; wave propagation.
Siyuan J. Shen, Jens C. Pfister and James D. Lee, Department of Mechanical and Aerospace Engineering, The George Washington University, Washington, DC 20052, U.S.A.

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