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

F Jeglic; P Niessen; DJ Burns

doi:10.1520/STP38835S

SYMPOSIA PAPER Published: 01 January 1973

STP38835S

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

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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 Q(ΔK) = Q₀ - C₁ log ΔK. The driving force for the process is inversely proportional to the square of the stress intensity range: A(ΔK) = C₂ ΔK^-2. Fatigue crack propagation rate as a function of temperature and stress intensity range is given by daDN=C2ΔK-2exp⁡-[Q0-C1log⁡ΔKRT] 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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Details

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

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

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