Viscoplasticity of a two-phase composite with the lamellar structure
- Rutgers Univ., New Brunswick, NJ (United States)
A nonlinear, time-dependent theory is developed to examine the viscoplastic creep behavior of a two-phase composite with the laminated structure. Here we consider the case that both phases may be elastic-viscoplastic. The rate-dependent constitutive equations of the ductile phases are nonlinear, exhibiting the work-hardening characteristics and strain rate sensitivity. A modem unified theory is adopted for the constitutive equations. To estimate the nonlinear elastic-viscoplastic response of the two-phase system, a linear viscoelastic comparison composite with an identical microgeometry is introduced which is in large part motivated by a line of recent developments in the rate-independent plasticity of composite materials. These developments have made use of the known effective elastic properties of a composite material to estimate the elastoplastic properties of a nonlinear composite. In this paper the viscoelastic properties of the comparison phases are taken to be of the Maxwell type, with a shear viscosity equal to the {open_quotes}secant{close_quotes} shear viscosity of the nonlinear viscoplastic phase at a given stage of deformation. This theory is then applied to study the transversely isotropic creep behavior of the nonlinear viscoplastic composite at various concentrations of the constituent phases.
- OSTI ID:
- 175322
- Report Number(s):
- CONF-950686-; TRN: 95:006111-0279
- Resource Relation:
- Conference: Joint applied mechanics and materials summer meeting, Los Angeles, CA (United States), 28-30 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of AMD - MD `95: Summer conference; PB: 520 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
An orthotropic theory of viscoplasticity based on over-stress for thermomechanical deformation and its application to laminated metal-matrix composites
Predictive forming of advanced thermoplastic composite structures. [Use of elastic/viscoplastic constitutive model]