Comparison of J-integral methods for the characterization of tough polypropylene grades close to the glass transition temperature

摘要: Abstract The fracture mechanical characterization of very tough Polypropylene at room temperature is great interest for many technical applications. Precision and validity obtained values can significantly be influenced by notching crack length determination, which has thoroughly been shown in literature. Additionally, the proximity to glass transition induce further uncertainties. aim this study compare different J-integral methods elastic plastic mechanics determine J-R curves tested materials. Methods consist classical multi-specimen, a single specimen method (load separation) statistical approach (Weibull). Specific data reduction procedures based on physical principles were applied reduce scattering achieve reliable values. In way, was achieved with critical verification used methods. Finally, determined toughness value showed good agreement surface texture inspected surfaces.