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Energy in elastic systems
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analysis approximation assume bending blunting brittle failures Chapter Charpy cm/min computed condition constant load crack front crack growth crack initiation crack length crack propagation crack speed crack tip craze stress criterion curves data for PMMA decrease deduced defined deformation density dependence determined ductile tearing dynamic edge notch effects elastic energy dissipation energy release rate fatigue finite flaw fracture mechanics Fracture toughness function geometry give HDPE homopolymer impact test increases integral Kc values kinetic energy ligament area line zone linear linear elastic load-deflection material methanol microvoiding mode modulus observed obtained occur parameter plane strain plane stress plotted polymers pressure range result rise rubber shear yielding shown in Fig shows slope slow crack growth solution specimen strain energy stress field stress intensity factor surface temperature tension thickness transition unstable variation velocity versus visco-elastic viscosity yield stress