Estimation of Ct parameter in transversely isotropic materials under transient creep conditions

✍ Scribed by Young Wha Ma; Kee Bong Yoon

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 1000 KB
• Volume: 77
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/j.engfracmech.2010.08.005

✦ Synopsis

The crack growth life assessment procedures at high temperature developed for isotropic materials need to be extended for anisotropic creeping materials. In this study, estimation of C t in transversely isotropic creeping materials is proposed. Equivalent creep coefficient (A eq ) is defined for the transversely isotropic materials and its calculation equation is derived in terms of the ratio between the longitudinal and the transverse creep coefficients. A series of finite element analysis was conducted and values of correction factors required in calculating C t were determined in tabular form. The newly proposed equation gave the same C t values as the finite element results under the full range of the creep conditions including the small scale creep.