SYMPOSIA PAPER Published: 01 January 1976
STP33381S

Spectrum Crack Growth Prediction Method Based on Crack Surface Displacement and Contact Analyses

Source

A method for prediction of crack growth behavior has been developed, based on evaluations of stress intensity caused by crack surface contact. The potential interference of the crack surfaces is determined from analyses of elastic displacements during loading and unloading and of the permanent deformation left in the wake of a growing crack. The potential interference is treated as a wedge acting behind the crack tip and the contact stresses created by this wedge are computed through an elastic-plastic analysis. The effective stress intensity range used for crack growth prediction is found by subtracting the stress intensity caused by these contact stresses from the applied stress intensity range. Comparisons of crack growth behavior predicted by this method and that measured in constant amplitude tests, with and without high loads, and in block spectrum tests have shown that the method accounts for load interaction effects in these cases. These effects include delayed retardation following high loads, crack growth acceleration during high loads, and dependence of growth rates on number of high loads.

Author Information

Dill, HD
McDonnell Aircraft Company, St. Louis, Mo.
Saff, CR
McDonnell Aircraft Company, St. Louis, Mo.
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Details
Developed by Committee: E08
Pages: 306–319
DOI: 10.1520/STP33381S
ISBN-EB: 978-0-8031-4672-3
ISBN-13: 978-0-8031-0344-3