ISO/FDIS 26843

ISO 26845:2009 specifies requirements for performing and evaluating instrumented precracked Charpy impact tests on steels using a fracture mechanics approach. Minimum requirements are given for measurement and recording equipment, such that similar sensitivity and comparable measurements are achieved. ISO 26845:2009 can be applied to other metallic materials by agreement. Dynamic fracture mechanics properties determined using ISO 26845:2009 are comparable to conventional large-scale fracture mechanics results when the corresponding validity criteria are met. Because of the small absolute size of the Charpy specimen, this is often not the case. Nevertheless, the values obtained can be used in research and development of materials, in quality control and service evaluation and to establish the variation of properties with test temperature under impact loading rates.