Publica
Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Obtaining SN curves from crack growth curves: An alternative to selfsimilarity
 International Journal of Fracture 187 (2014), Nr.1, S.159172 ISSN: 03769429 ISSN: 15732673 ISSN: 00207268 

 Englisch 
 Zeitschriftenaufsatz 
 Fraunhofer IWM () 
Abstract
A crack growth model that allows us to obtain the SN curves from the crack growth rate curves is presented in an attempt to harmonize the stress based and fracture mechanics approaches in lifetime prediction of long cracks propagation. First, using the Buckingham theorem, the crack growth rate curve is defined over all its range as a cumulative distribution function based on a normalized dimensionless stress intensity factor range . Then, a relevant theorem is derived that provides an alternative to selfsimilarity allowing significant reduction of experimental planning. In this way, different crack growth curves for different stress ranges and initial crack lengths can be obtained from a particular crack growth curve under some conditions. The SN field is obtained from the crack growth curves, showing the close relation between the fracture mechanics and stress approaches. Finally, the model is applied to a particular set of experimental data to obtain the crack growth rate curve and the SN curves of a certain material for a subsequent fatigue lifetime assessment.