Fatigue crack propagation in shafts with shoulder fillets

✍ Scribed by Erik Højfeldt; Carl B. Østervig

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 652 KB
• Volume: 25
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(86)90256-0

✦ Synopsis

This paper presents a fracture mechanical analysis and computational procedure for the propagation of surface cracks in shafts with shoulder fillets loaded in pure bending. The analysis makes use of Sib's hypoth~is for minimum f-factor in the dete~ination of the g~metry of the crack at different stages of the propagation.

At each stage, the values of the stress intensity factors RI, Ictr and Icm along the crack front are determined by substituting displacements calculated by means of the finite element approach into analytical expressions. The computational results are shown to provide a convenient basis for lifetime predictions by use of Paris' law. In addition to the analytical and computational part of the work experiments with seven steel shafts are carried out in a 400 kN servohydraulic testing machine. Finally the computational and experimental results are compared and excellent agreement is obtained.