Variation of material failure curve with constraint

✍ Scribed by M. Hadj Meliani; Z. Azari; G. Pluvinage; Y.G. Matvienko

• Publisher: Elsevier
• Year: 2011
• Tongue: English
• Weight: 383 KB
• Volume: 10
• Category: Article
• ISSN: 1877-7058
• DOI: 10.1016/j.proeng.2011.04.118

✦ Synopsis

A two-parameter fracture criterion has been proposed to predict fracture conditions of notched components. This criterion includes the critical notch stress intensity factor K ,c , which represents fracture toughness of a material with a notch of radius , and the second non-vanishing parameter from the Williams equation, A 3 term. The effective A 3 -term A 3,ef has been estimated as the average value of the A 3 term distribution in the region ahead of the notch tip at the effective distance X ef . These parameters were derived from the volumetric method of notch fracture mechanics. The master curve K ,c =f(A 3,ef ) has been established as a result of the notched specimen. It was shown that the notch fracture toughness is a linear decreasing function of the A 3ef,c -stress. The use of the master curve to predict fracture conditions was demonstrated on gas pipes with the longitudinal surface notch.