A global/local theory of fatigue crack propagation

✍ Scribed by J.S. Short; D.W. Hoeppner

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 952 KB
• Volume: 33
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(89)90022-2

✦ Synopsis

Most fatigue crack proration

studies reported in the literature have been conducted from either a continuum or micro-mechanics point of view. Attempts to combine these points of view within a single experimental study or modeling effort have been relatively scarce. This is surprising considering the global/local nature of the Griffith fracture theory from which modem fracture mechanics theories have emerged. This paper suggests a means of unifying continuum and micro-mechanics approaches by describing fatigue crack propagation processes at both global and local levels in terms of internal energy. By equating the rate of internal energy change as determined from ~ntinuum and ~crostmctur~ models, a fatigue crack propagation rate equation may be obtained which includes parameters descriptive of the fatigue process on both the continuum and microstructural levels.