We study three “incompressibility flavors” of linearly elastic anisotropic solids that exhibit volumetric constraints: isochoric, hydroisochoric, and rigidtropic. An isochoric material deforms without volume change under any stress system. An hydroisochoric material does so under hydrostatic stress. A rigidtropic material undergoes zero deformations under a certain stress pattern. Whereas the three models coalesce for isotropic materials, important differences appear for anisotropic behavior. We find that isochoric and hydroisochoric models under certain conditions may be hampered by unstable physical behavior. Rigidtropic models can represent semistable physical materials of arbitrary anisotropy while including isochoric and hydroisochoric behavior as special cases.
Volumetric Constraint Models for Anisotropic Elastic Solids
Contributed by the Applied Mechanics Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF APPLIED MECHANICS. Manuscript received by the ASME Applied Mechanics Division, August 9, 2002, final revision, February 15, 2004. Associate Editor: K. R. Rajagopal.
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Felippa , C. A., and On˜ate , E. (November 9, 2004). "Volumetric Constraint Models for Anisotropic Elastic Solids ." ASME. J. Appl. Mech. September 2004; 71(5): 731–734. https://doi.org/10.1115/1.1748318
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