Resonance controlled fatigue crack propagation

✍ Scribed by A. Dentsoras; A.D. Dimarogonas

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 475 KB
• Volume: 17
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(83)90088-7

✦ Synopsis

~~-Fa~~e

crack growth in resonating structural members is studied. The crack Preston rate is related to the stress intensity factor range by way of the well known power law. The depth of the crack determines the local flexibility due to crack which in turn inlluences the dynamic response of the system under an external force with constant amplitude and frequency. The propagating crack introduces additional flexibility to the system which results in gradual shift away from the resonance with smaller loading of the cracked section. This slows down the crack growth rate.

It was shown that this mechanism can guide the system to a value of the crack growth rate below a conventions threshold rate which can be interpreted as dynamic crack arrest. It was found that material damping is the decisive factor de~rm~mg the crack growth rate in a resonant system where the material damping is the dominant damping mech~~sm of the system.