Yield conditions for deformation of amorphous polymer glasses
arXiv:cond-mat/0104494 · doi:10.1103/PhysRevE.64.051801
Abstract
Shear yielding of glassy polymers is usually described in terms of the pressure-dependent Tresca or von Mises yield criteria. We test these criteria against molecular dynamics simulations of deformation in amorphous polymer glasses under triaxial loading conditions that are difficult to realize in experiments. Difficulties and ambiguities in extending several standard definitions of the yield point to triaxial loads are described. Two definitions, the maximum and offset octahedral stresses, are then used to evaluate the yield stress for a wide range of model parameters. In all cases, the onset of shear is consistent with the pressure-modified von Mises criterion, and the pressure coefficient is nearly independent of many parameters. Under triaxial tensile loading, the mode of failure changes to cavitation.
arXiv comment9 pages, 8 figures, revtex
References in corpus (5)
- Simple Microscopic Theory of Amontons' Laws for Static Friction
- Molecular Dynamics Simulations of the Thermal Glass Transition in Polymer Melts: Alpha-Relaxation Behaviour
- What is the Entanglement Length in a Polymer Melt ?
- Local Reorientation Dynamics of Semiflexible Polymers in the Melt
- Simulations of the Static Friction Due to Adsorbed Molecules
Cited by in corpus (22)
- Local elasticity map and plasticity in a model Lennard-Jones glass
- Modeling the mechanics of amorphous solids at different length and time scales
- Growth, microstructure, and failure of crazes in glassy polymers
- Cracks and Crazes: On calculating the macroscopic fracture energy of glassy polymers from molecular simulations
- Shear yielding of amorphous glassy solids: Effect of temperature and strain rate
- Strain Hardening of Polymer Glasses: Entanglements, Energetics, and Plasticity
- Unified Description of Aging and Rate Effects in Yield of Glassy Solids
- Simulations of aging and plastic deformation in polymer glasses
- Contact and Friction of Nano-Asperities: Effects of Adsorbed Monolayers
- Strain localization and anisotropic correlations in a mesoscopic model of amorphous plasticity
- Predictors of cavitation in glassy polymers under tensile strain: a coarse grained molecular dynamics investigation
- Measurements of the Yield Stress in Frictionless Granular Systems
- A Multiscale Multisurface Constitutive Model for The Thermo-Plastic Behavior of Polyethylene
- Capillary Adhesion at the Nanometer Scale
- Mechanical rejuvenation and over-aging in the soft glassy rheology model
- Nonmonotonic dependence of polymer glass mechanical response on chain bending stiffness
- Influence of ensemble boundary conditions (thermostat and barostat) on the deformation of amorphous polyethylene by molecular dynamics
- Constitutive relations for plasticity of amorphous carbon
- A Review on Molecular Simulations for the Rupture of Polymer Networks
- Modification of the aging dynamics of glassy polymers due to a temperature step
- Intrinsic vulnerabilities to mechanical failure in nanoscale films
- Influence of Stretching Boundary Conditions on Fracture in Phantom Star Polymer Networks: From Volume to Cross-sectional Area Conservation