ASTM E 399 - 12 Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness KIc of Metallic Materials

American Society for Testing and Materials (ASTM). Current edition approved Nov. 15, 2012. Published January 2013. Originally approved in 1970. Last previous edition approved in 2009 as E399 – 09. 33 p. This test method covers the determination of fracture toughness (KIc) of metallic materials under predominantly linear-elastic, plane-strain conditions using fatigue precracked specimens having a thickness of 1.6 mm (0.063 in.) or greater subjected to slowly, or in special (elective) cases rapidly, increasing crack-displacement force. Details of test apparatus, specimen configuration, and experimental procedure are given in the Annexes.