6533b7dbfe1ef96bd1270993
RESEARCH PRODUCT
Slow crack propagation in polyethylene: determination and prediction
Manfred FleissnerWilli F. MüllerWitold Brostowsubject
Materials sciencePolymers and PlasticsOrganic ChemistryMineralogyThermodynamicsFracture mechanicsFunction (mathematics)PolyethyleneStress levelchemistry.chemical_compoundchemistryPropagation rateMaterials ChemistryRelaxation (physics)Stress intensity factordescription
Abstract A model is developed connecting the stress intensity factor KI with the propagation rate d h d t of slow cracks. The model is based on the concept of the chain relaxation capability. Experimental KIversus d h d t data are reported for polyethylenes of varying molecular mass M, density ϱ, initial notch length h0 and at different stress levels σ. Predictions of the theory concerning the effect of each of these parameters on crack propagation are confirmed by the experimental results. In particular, the equation for KI as a function of d h d t does not contain h0 nor σ. Experimental plots of KIversus d h d t for common M but different h0 values coincide into a single curve. Also plots for specimens of the same class but subjected to different stress levels form a single curve.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1991-01-01 | Polymer |