The long-time strength of high-density polyethylene (HDPE) in biaxial tension has been experimentally investigated at ratios of the principal stress components ν=σ1/σ2=0, 0.5, 1, 4. The maximum duration of the experiments was 2500 h. The limit surface for HDPE has been constructed. It is shown that the limit surface for this material varies with time as the mode of fracture changes from quasibrittle at medium stresses to brittle at low stresses. In the case of quasibrittle fracture the condition of equivalence of simple and plane states of stress is satisfactorily described by the Malmeister and Gol'denblat-Kopnov criteria, and in the case of brittle fracture by the maximum normal stress criterion.
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Grinman, A.M., Gol'dman, A.Y. Long-time strength of polyethylene in biaxial tension. Polymer Mechanics 12, 352–360 (1976). https://doi.org/10.1007/BF00857704
- Normal Stress
- Limit Surface
- Principal Stress
- Brittle Fracture