Analysis of the Importance of the Crack Closure in the Driving Force for the Fatigue Crack Growth in Metastable Austenitic Stainless Steels

摘要: In this paper we study the fatigue crack propagation behavior of an austenitic metastable stainless steel in near threshold region. The used research is investigated two different microstructural conditions: annealed and cold rolled. tests were conducted using procedure ΔK decreasing constant R, Kmax. assessment curves growth trajectory map proposed by Sadananda Vasudevan [Int. J. Fatigue 26 (2004) 39-47] points out that mechanism controls advance material changes as a function level applied. On other side, analysis shows cannot be explained entirely concepts driving forces. contribution closure to decrease rate quantified methods, measurement opening load done standard method ASTM E647-08ɛ1 ACRn2 method. basis last profiles, which are uncharacteristic materials with austenite/martensite interface, it established induced roughness. At end explanation suggested for ratio effects forces taking into account closure.