Proceedings of the Royal Society of London A Mathematical and Physical Sciences · 1981 · 74 citations · 7 references
EngineeringMaterials EngineeringMaterials ScienceMechanical Behavior Of MaterialsPolymer EngineeringPolymer MaterialsDamage MechanicsFracture MechanicsFracture ToughnessImpact MechanicsStrength Of MaterialsStress-strain BehaviorAdiabatic Heating EffectsFracture Of PolymersFracture Toughness Of PolymersFracture Under ImpactFracture Under Impact LoadingImpact TestingMaterial Failure Under ImpactToughening Mechanisms
Abstract Some impact tests are described in which Gc, the fracture toughness, of three polymers was determined over a range of strain rates and temperatures. It was found that at high strain rates there was a substantial variation of Gc with rate. When this was investigated as a function of loading times, it was observed that the most likely explanation was in terms of notch tip blunting induced by adiabatic heating at the crack tip. A model of this process is presented which provides a good description of the observations and suggests some useful guidelines for practical impact testing.
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