Stress intensity factors for surface cracks in single-edge notch bend specimen by a three-dimensional weight function method

• Published in: Fatigue & fracture of engineering materials & structures Vol. 39; no. 11; pp. 1407 - 1418
• Main Authors: Zhao, X C, Wu, X R, Newman, J C, Tong, D H
• Format: Journal Article
• Language: English
• Published: Oxford Blackwell Publishing Ltd 01-11-2016; Wiley Subscription Services, Inc
• Subjects: Crack propagation; Engineering; Fatigue failure; Finite element method; Fracture mechanics; Notches; pin loading; remote tension; SENB specimen; Stress intensity factor; Stress intensity factors; surface crack at notch; Surface cracks; three-dimensional weight function; Weight function
• ISSN: 8756-758X; 1460-2695
• DOI: 10.1111/ffe.12458

Stress intensity factors for half‐elliptical surface cracks at a semi‐circular notch in a recently developed single‐edge notch bend specimen are determined for a wide range of geometrical parameters using a three‐dimensional weight function method. Two load cases of pin loading and uniform remote tension are considered. The results are in good agreement with abaqus/franc3d finite element analysis. It is found that the Ziegler–Newman engineering similitude approach (programmed into the Fatigue Crack Growth Structural Analysis life‐prediction code) produces good results for a wide range in a/c ratios. Expressions by multi‐variable curve fitting to the weight function results are presented for easy engineering applications.