Crack opening displacement approach to assess multiaxial low cycle fatigue

✍ Scribed by Dimitar Tchankov; Masao Sakane; Takamoto Itoh; Naomi Hamada

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 283 KB
• Volume: 30
• Category: Article
• ISSN: 0142-1123
• DOI: 10.1016/j.ijfatigue.2007.04.014

✦ Synopsis

This paper proposes universal J-integral range for correlating multiaxial low cycle fatigue lives. The universal J-integral range is a function of Young's modulus, yield stress, strain multiaxiality and specimen geometry, so it is not necessary to conduct multiaxial low cycle fatigue experiments to determine the universal J-integral range. The universal J-integral range was derived from J-integral and the equivalent strain based on crack opening displacement (COD strain) for a multiaxially loaded mode I crack. The COD strain is a parameter expressing the strain intensity ahead of a mode I crack subjected to multiaxial stresses and strains. The universal J-integral range successfully correlated the multiaxial low cycle fatigue lives of type 304 stainless steel, Cr-Mo-V steel, Inconel 738 LC nickel base superalloy and 63Sn-37Pb eutectic solder universally within a factor of three band independent on the material.