A cumulative damage theory for creep and creep-fatigue interaction

✍ Scribed by M. Ben-Amoz

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 451 KB
• Volume: 39
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(91)90045-3

✦ Synopsis

A

cumulative damage theory is developed based on the concept of bounds on residual life. Previous results applicable to fatigue are generalized to creep-rupture and to creepfatigue interaction. By defining a creep endurance limit and void-initiation life fractions, a complete symmetry is established between the creep and fatigue cumulative damage problems. This enables the derivation of bounds for two-stage creep exposures as well as for creep-fatigue and fatigue-creep interactions. The question of test data scatter in cumulative damage tests is considered, and optimum bounds are derived which bracket the entire test data scatter.