Physical Basis for a Pressure-Dependent Yield Criterion for Polymers
Final rept. Sep 1987-Jan 1989,
LAWRENCE LIVERMORE NATIONAL LAB CA CHEMISTRY AND MATERIALS SCIENCE DEPT
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A previously empirical pressure-dependent yield criterion for polymeric solids is derived from linear thermoelasticity and equilibrium thermodynamics. The assumption of a critical value of the mechanical component of the internal energy density at the onset of plastic deformation leads to an explicit expression for the yield condition in terms of the stress invariants and thermomechanical properties of the material Order of magnitude agreement between the linear theory and published experimental data is obtained for a variety of polymers, suggesting a possible physical basis for pressure-dependent yielding.
- Polymer Chemistry