I have read in some articles about unstable crack growth which is sometimes referred to as RCP, however it seems that there is a clear difference between unstable crack growth and RCP. According to a paper from Leevers, P. (2001; ISBN: 0-08-0431526 📷 pp. 3322±3329 ;see attached image), he differentiated between an unstable crack growth which follows a slow crack Growth (SCG) when a critical value K1c is reached and an RCP which also follows SCG, however in a different way. I am grateful for any kind of explanation.
Please see our article:
An applied method for fatigue life assessment of engineering components using Rigid-Insert Crack Closure Model
Can you read this paper
https://www.sciencedirect.com/science/article/abs/pii/S0013794418303126
There are three stages: crack initiation, slow crack growth, and rapid crack propagation, leading to final rupture.
Rapid crack propagation occurs when the energy released by a virtual crack extension is sufficient to supply energy requirement for the surfaces created by the virtual crack extension.
https://www.sciencedirect.com/topics/engineering/rapid-crack-propagation
https://www.sciencedirect.com/topics/engineering/slow-crack-growth
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