BS EN ISO 15653:2018 pdf free.Metallic materials — Method of test for the determination of quasistatic fracture toughness of welds. BS EN ISO 15653 specifies methods for determining fracture toughness in terms of stress intensity factor (K), crack tip opening displacement or CTOD (δ) and experimental equivalent of the J-integral for welds in metallic materials (J). BS EN ISO 15653...