Application of an extrapolation method in thermocyclic failure analysis

✍ Scribed by H. Kiewel; J. Aktaa; D. Munz

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 815 KB
• Volume: 182
• Category: Article
• ISSN: 0045-7825
• DOI: 10.1016/s0045-7825(99)00085-7

✦ Synopsis

Applying of modern inelastic material models requires much computer resources. This especially is a decisive problem for simulating cyclic loadings of components having a high number of cycles lifetime. To overcome this problem, we extrapolate the complete set of internal variables over a certain number of cycles. The reduction of computer time amounts to a factor of 10±1000. To demonstrate the capabilities of our new scheme, a failure analysis has been carried out for a ring combustor of a gas turbine. The material model used for this investigation is based on the well-known Chaboche model in combination with the damage model by Kachanov/ Rabotnov.