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The ASTM E1820 test method covers procedures and guidelines for the determination of fracture toughness of metallic materials using the following parameters: K, J, and CTOD (δ). Toughness can be measured in the R-curve format or as a point value. The fracture toughness determined in accordance with this test method is for the opening mode (Mode I) of loading.
Before conducting ASTM E1820, it is important to read the entire specification. Standards can be obtained from appropriate standard authorities.