Energy considerations in fatigue crack propagation

✍ Scribed by Y. Izumi; M. E. Fine; T. Mura

• Book ID: 104620401
• Publisher: Springer Netherlands
• Year: 1981
• Tongue: English
• Weight: 594 KB
• Volume: 17
• Category: Article
• ISSN: 1573-2673
• DOI: 10.1007/bf00043118

✦ Synopsis

The concept of Griffith fracture theory was extended to fatigue crack propagation problems by defining the Gibbs free energy of solids under cyclic loading.

As a result, the rate of fatigue crack propagation, dc/dN, was obtained as

where K is a proportionality constant (0<K <£ 1), AK is the stress intensity amplitude, # is the shear modulus, cr is an appropriate strength parameter for fatigue failure of the alloy and U is the energy to make a unit fatigue surface.