SYMPOSIA PAPER Published: 01 January 1999

A Fractographic Study of Load-Sequence-Induced Mixed-Mode Fatigue Crack Growth in an Al-Cu Alloy


Fatigue crack growth behavior was studied on C(T) and SE(T) specimens from Al-Cu alloy 2014 using specially-designed load sequences. The experiments were organized to induce microscopic mixed-mode fatigue crack growth while at the same time reducing or eliminating fatigue crack closure. This was achieved by switching between high-amplitude, low-stress ratio and low-amplitude, high-stress ratio cycles. Retardation effects observed under these conditions are attributed to local crack branching and mixed-mode conditions induced by variable amplitude loading.

Author Information

Ashbaugh, NE
University of Dayton Research Institute, Dayton, OH
Porter, WJ
University of Dayton Research Institute, Dayton, OH
Prakash, RV
BiSS Research, Bangalore, India
Sunder, R
BiSS Research, Bangalore, India
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Developed by Committee: E08
Pages: 258–278
DOI: 10.1520/STP14253S
ISBN-EB: 978-0-8031-5406-3
ISBN-13: 978-0-8031-2602-2