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Large inelastic deformation of glassy polymers. part I: rate dependent constitutive model

1988; Elsevier BV; Volume: 7; Issue: 1 Linguagem: Inglês

10.1016/0167-6636(88)90003-8

1872-7743

Mary C. Boyce, David M. Parks, A. S. Argon,

Mechanical Behavior of Composites

Glassy polymers constitute a large class of engineering solids. In order to successfully analyze the warm (near the glass transition temperature) mechanical processes by which many glassy polymeric products are manufactured, as well as to ascertain the response of the resulting part to service life loading conditions, a constitutive law that properly accounts for the large, inelastic deformation behavior of these materials is required. Such behavior is known to exhibit strain rate, temperature, and pressure dependent yield, as well as true strain softening and hardening after yield. This paper develops a three-dimensional constitutive model based on the macromolecular structure of these materials and the micromechanism of plastic flow which encompasses these above dependencies. The experiments necessary to determine the material properties used in the model are also identified. The model predictions for the true stress-strain behavior of PMMA are then compared with experimental data reported in the literature.