Short glass fiber reinforced (SGFR) PA6,6/PP blends with 20 wt% styrene‐ethylene/butylene‐styrene triblock copolymers (SEBS) grafted with different levels of maleic anhydride (MA) were studied using both the essential work of fracture (EWF) and J ‐integral fracture toughness techniques. Good linearity was found between the plane strain specific fracture work, W f , and the ligament length, l , in single‐edge notched bend (SENB) specimens. The two fracture mechanics parameters were compared and there was good agreement between the J ‐integral fracture initiation toughness, J IC , and the specific essential fracture work, W Ie . The skin‐core morphology characteristic of injection molded short fiber reinforced thermoplastics (SFRT) was also revealed using the EWF approach.
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Wong et al. (1999) studied this question.
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