Threshold toughness of polymers in the ductile to brittle transition region by different approaches

摘要: Abstract The fracture behavior of polymers in the ductile-to-brittle region is neither completely brittle nor entirely ductile. Besides, scatter toughness results impairs situation. Consequently, conventional methods based exclusively either on linear elastic mechanics theory (LEFM) or non-linear (NLEFM) are not suitable. It was demonstrated previously, that Weibull statistical method could be successfully used to determine the threshold displaying behavior. present study compares value determined by approach with other critical values calculated following different suitable approaches: Low temperature plane strain toughness, Plastic zone corrected Stable and unstable propagation combined model, J extrapolated at zero stable value, Quasi J–R curve. analysis carried out data points taken from tests performed polypropylene homopolymer, PPH, a blend PPH an elastomeric polyolefin, PPH/POes. this indicate statistical, yield very similar being practically equivalent. In case, slightly smaller than minimum displayed experimental replicas, suggesting it actual representative material toughness. Among these methodologies, Statistical Method applicable even if crack growth difficult determine. On hand, methodologies LEFM tended underestimate conservative while J-R curve NLEFM overestimated PPH/POes value.