Statistical analysis of the strength and lifetime under tension of crystalline polymeric solids

[摘要] The ductile fracture behavior under uniaxial tension of melt-crystallized isotactic polypropylene specimens at room temperature was investigated from a statistical point of view. Each tensile test was performed more than one hundred times and statistical data for the breaking point were obtained under each tensile condition. The probability distribution curves of the fracture time and strength approximately followed Gaussian statistics at lower tensile speeds, but changed to a Weibull function at higher-speed tests. Additionally, with increasing tensile speed the mean and standard deviation of the fracture time decreased linearly. The toughness, which is the total area under the stress-strain curves, was found to be independent of the tensile conditions, indicating that fracture toughness is a criterion for fracture under tension.

[发布机构] Institute of Science and Engineering, Kanazawa University, Kakuma Campus, Kanazawa; 920-1192, Japan^1;Toray Battery Separator Film Co., Ltd., Nasu-Shiobara, Tochigi; 329-2763, Japan^2

[效力级别] 化学

[关键词] Fracture behavior;Gaussian statistics;Isotactic polypropylene;Mean and standard deviations;Polymeric solids;Statistical datas;Uniaxial tensions;Weibull functions