SYMPOSIA PAPER Published: 01 January 1986

An Experimental and Numerical Investigation of the Growth and Coalescence of Multiple Fatigue Cracks at Notches


This paper describes results of an experimental and numerical study concerned with the growth and coalescence of multiple fatigue cracks. A multi-degree-of-freedom algorithm is developed to predict the cyclic growth of separate cracks which develop along the bore of a circular notch. The crack shapes and sizes are allowed to develop naturally as they join into a single flaw which then propagates to failure. Experiments are described with multiflawed specimens of titanium and Waspaloy. The numerical model does an excellent job of predicting the crack coalescence life in all the specimens.

Author Information

Grandt, AF
School of Aeronautics and Astronautics, Purdue University, W. Lafayette, IN
Thakker, AB
Pratt & Whitney Aircraft Group, West Palm Beach, FL
Tritsch, DE
Sikorsky Aircraft, Stratford, CT
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Developed by Committee: E08
Pages: 239–252
DOI: 10.1520/STP17399S
ISBN-EB: 978-0-8031-4972-4
ISBN-13: 978-0-8031-0472-3