Influence of random overloads on fatigue crack lifetime and reliability

✍ Scribed by R. Arone

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 713 KB
• Volume: 30
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(88)90194-4

✦ Synopsis

Abstmct-A

stochastic model is presented, describing fatigue crack growth under random overloads and incorporating the situations of fracture occurrence either under an overload or under the base-line load. It is a variant of an earlier model, based on presentation of the delay time as a purely discontinuous Markov process, and modified so as to account for the role of overloads in the event of fracture. It was shown that a strongly beneficial effect of overloads on lifetime is achieved under an optimal combination of material retardation response and frequency and magnitude of the overloads. It was also shown that the more stringent the reliability requirements, the less favourable the lifetime predictions.