SYMPOSIA PAPER Published: 01 January 1973

Temperature Dependence of Fatigue Crack Propagation in an Al-2.6Mg Alloy


Fatigue crack propagation has been studied in an Al-2.6Mg alloy between room temperature and 300 C. It is shown that the fatigue crack propagation rate is controlled by volume diffusion. The activation barrier for volume diffusion (Q0) is lowered by the applied stress intensity range ΔK so that QK) = Q0 - C1 log ΔK. The driving force for the process is inversely proportional to the square of the stress intensity range: AK) = C2 ΔK-2. Fatigue crack propagation rate as a function of temperature and stress intensity range is given by daDN=C2ΔK-2exp-[Q0-C1logΔKRT] A special case of this equation is the well-known Paris equation.

Author Information

Jeglic, F
University of Waterloo, Waterloo, Ont., Canada
Niessen, P
University of Waterloo, Waterloo, Ont., Canada
Burns, DJ
University of Waterloo, Waterloo, Ont., Canada
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Developed by Committee: E08
Pages: 139–148
DOI: 10.1520/STP38835S
ISBN-EB: 978-0-8031-5576-3
ISBN-13: 978-0-8031-5528-2