The method of normalization is used to develop the J‐R curve fracture toughness characterization for polymeric materials. This method can develop J‐R curves directly from load vs. displacement records without a need for an on‐line crack monitoring system. It was used previously to develop J‐R curves for metallic materials and is applied here for the first time to polymer materials. Single edge notched bend specimens of rubber toughened nylon 6/6 and rubber toughened amorphous nylon are used in this s…
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