Determination of J-R curve of polypropylene copolymers using the normalization method

In this paper the applicability of the load normalization method to determi ne J-R curves of polypropylene copolymers (PP) is analyzed. This method all ows the determination of resistance curves ideally from a single fracture t est, and it is based on the load separation principle, which assumes that l oad can be separated in two multiplicative functions, the geometry function , G(a/W), and the deformation function, H(nu (pl)/W), which depend of the c rack depth and the plastic displacement, respectively. The load separation validity has been checked for two different PP copolymers (block and random copolymers) and the load normalization method has been applied in order to determine and analyze the resistance curves, which have been compared, as a reference, with those obtained by the multiple specimen method. The appli cability of the load normalization method to PP copolymers is analyzed by i ntroducing some variations in the general procedure: Firstly, the deformati on function is determined using either a power law fit or the so-called LMN function. With the power law, two different fitting methods have been test ed: the usual "6 + 1" method and a "6 + 6" method proposed here for giving more weight to the final point of the curve. Secondly, the influence of the material crack tip blunting has been analyzed quantifying it through diffe rent values of the constriction factor (m) in the general expression of the blunting line. Finally, the effect of the separable blunting region extens ion on the J-R curve has been also analyzed by establishing different separ able blunting zones. (C) 2001 Kluwer Academic Publishers.