TEMPERATURE AND STRAIN-RATE DEPENDENCE OF FRACTURE-TOUGHNESS OF PHENOLPHTHALEIN POLYETHER KETONE
Data(s) |
1995
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Resumo |
A strong strain-rate and temperature dependence was observed for the fracture toughness of phenolphthalein polyether ketone (PEK-C). Two separate crack-blunting mechanisms have been proposed to account for the fracture-toughness data. The first mechanism involves thermal blunting due to adiabatic heating at the crack tip for the high temperatures studied. In the high-temperature range, thermal blunting increases the fracture toughness corresponding to an effectively higher test temperature. However, in the low-temperature range, the adiabatic temperature rise is insufficient to cause softening and Jic increases with increasing temperature owing to viscoelastic losses associated with the p-relaxation there. The second mechanism involves plastic blunting due to shear yield/flow processes at the crack tip and this takes place at slow strain testing of the single-edge notched bending (SENB) samples. The temperature and strain-rate dependence of the plastic zone size may also be responsible for the temperature and strain-rate dependence of fracture toughness. |
Identificador | |
Idioma(s) |
英语 |
Fonte |
HAN YC;YANG YM;LI BY;FENG ZL.TEMPERATURE AND STRAIN-RATE DEPENDENCE OF FRACTURE-TOUGHNESS OF PHENOLPHTHALEIN POLYETHER KETONE,JOURNAL OF MATERIALS SCIENCE,1995,30(14):3658-3661 |
Palavras-Chave | #CRACK-BLUNTING MECHANISMS #RUBBER-TOUGHENED EPOXY #POLY(METHYL METHACRYLATE) #PLASTIC-DEFORMATION #POLYMERS #RESINS #PROPAGATION #BEHAVIOR #PMMA |
Tipo |
期刊论文 |