The inadequacy of the plane-strain fracture toughness test requirements

✍ Scribed by M.O. Lai; W.G. Ferguson

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 561 KB
• Volume: 13
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(80)90060-0

✦ Synopsis

Experimental data obtained from 25 mm thick Comsteel En25 compact tension specimens tempered from the as-quenched state to 650°C showed that the ASTM Standard, E399-74, specimen size and plasticity requirements were not able to detect excessive yielding and thus the onset of true plane-strain conditions. At tempering temperatures higher than 450°C specimens were found to have a net section stress to yield stress ratio of well above two thirds. The true plane-strain fracture toughness at 6OO"C, the grossly yielded region, was estimated using the J-integral approach.