Fracture Properties of Polymers at Cryogenic Temperatures
The cryogenic fracture behavior has been investigated on several thermo — plastic polymers: HDPE, PS and PC. The stress intensity factor and the critical energy release rate have been measured as a function of the deformation rate at 4.2 K and 77 K. Due to the brittleness of polymers at low temperatures almost unstable crack propagation has been observed even at extremely low deformation rates. The crack propagation is discontinuous. Crack arrest occurs by adiabatic heating of the crack tip.
KeywordsStress Intensity Factor Plastic Zone Linear Elastic Fracture Mechanic Crack Arrest Adiabatic Heating
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