SYMPOSIA PAPER Published: 01 January 1988
STP27221S

Correlation Between Numerically Predicted Crack Opening Load and Measured Load History Dependent Crack Growth Threshold

Source

The present paper deals with the application of a two-dimensional (plane stress) elastoplastic (Prager's flow rule) finite—element analysis to predict crack opening stresses during the crack growth process under cyclic loading. The main results obtained are as follows:

Crack closure is achieved at crack tip as soon as unloading begins. Under constant amplitude loading, the ratio of the opening force to the maximum force is nearly constant and in good accordance with experiment. ΔKeff is an appropriate parameter if and only if some plastic strain correlations are satisfied around crack tip. This is the case in two-level (HiLo) loadings; so it is possible to have an evident explanation of crack arrest phenomenon. Comparisons with experiments are, in this case, quite satisfactory.

Author Information

Anquez, L
Office National d'Etudes et de Recherches Aérospatiales, Chatillon Cedex, France
Baudin, G
Office National d'Etudes et de Recherches Aérospatiales, Chatillon Cedex, France
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Details
Developed by Committee: E08
Pages: 380–397
DOI: 10.1520/STP27221S
ISBN-EB: 978-0-8031-5052-2
ISBN-13: 978-0-8031-0996-4