SYMPOSIA PAPER Published: 01 January 1973

Effect of Interrupting Fatigue by Periods of Heat for Aluminum Alloy Structural Elements


Effects of heat on fatigue have been studied by interrupting fatigue tests at ambient temperature by single periods of heating with and without steady load applied. The tests employed constant amplitude and random loading on various structural elements in a number of aluminium-copper alloy materials. Heating was applied at temperatures in the range 100 to 150 C for times ranging from 1 h to 20 000 h.

The initiation of fatigue cracks was affected by heating, particularly at temperatures above 110 C when the effects occurred comparatively rapidly. The two mechanisms of importance were changes in microstructure at the machined surface which encouraged initiation, and changes in residual stress by creep which encouraged or discouraged initiation according to the creep being compressive or tensile.

It is suggested that similar mechanisms operate also during the crack propagation phase of the fatigue life.

Author Information

Heath-Smith, JR
Royal Aircraft Establishment, Farnborough, Hants, England
Kiddle, FE
Royal Aircraft Establishment, Farnborough, Hants, England
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: E08
Pages: 500–511
DOI: 10.1520/STP38866S
ISBN-EB: 978-0-8031-5576-3
ISBN-13: 978-0-8031-5528-2