Delta-K correlation of fatigue crack growth rates under general monotonic yielding

✍ Scribed by S. A. Seetharam; P. K. Dash

• Publisher: Springer Netherlands
• Year: 1991
• Tongue: English
• Weight: 299 KB
• Volume: 52
• Category: Article
• ISSN: 1573-2673
• DOI: 10.1007/bf00020260

✦ Synopsis

Linear Elastic Fracture Mechanics, LEFM, principles are successfully used to characterize the behavior of flawed structures and components under monotonic loading. Crack length increment, da, correlates with maximum stress intensity factor, K , when the monotonic plastic zone size is small. Cracks can grow under cyclic loading even at stress levels lower than that required for crack extension under static loading. Pads et al. [1,2] established the correlation between crack growth rate, da/dN, and stress intensity factor range, delta-K, of the load cycle. Aplication of LEFM principles to crack extension under monotonic cyclic loading can be seen as:

response correlating restriction parameter parameter Monotonic da Kmax Monotonic plastic zone size small Cyclic da/dN delta-K ?