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This paper presents a review of available evidence of higher than expected crack growth rates obtained under variable amplitude loading, and explanations for such behaviour. New findings based on fatigue tests performed using 6082 T651 aluminium alloy under a simple loading sequence that was expected to cause crack growth acceleration are presented. Crack propagation was monitored using both optical and the direct current potential drop (DCPD) method. In addition, electrical resistance strain gauges were used to detect the presence of crack closure. Scanning electron microscopy was also performed to correlate observed striations on the fracture surfaces with applied load sequences

Accelerated Fatigue Crack Growth in 6082 T651 Aluminium Alloy Subjected to Periodic Underloads