SYMPOSIA PAPER Published: 01 January 1989

Stress-Intensity Factors for Small Surface and Corner Cracks in Plates


Three-dimensional finite-element and finite-element-alternating methods were used to obtain the stress-intensity factors for small surface and corner cracked plates subjected to remote tension and bending loads. The crack-depth-to-crack-length ratios (a/c) ranged from 0.2 to 1, the crack-depth-to-plate-thickness ratios (a/t) from 0.05 to 0.2. The performance of the finite-element alternating method was studied on these crack configurations. A study of the computational effort involved in the finite-element-alternating method showed that several crack configurations can be analyzed with a single rectangular mesh idealization, whereas the conventional finite-element method requires a different mesh for each configuration. The stress-intensity factors obtained with the finite-element-alternating method agreed well (within 5%) with those calculated from the finite-element method with singularity elements.

The stress-intensity factors calculated from the empirical equations proposed by Newman and Raju were generally within 5% of those calculated by the finite-element method. The stress-intensity factors given herein should be useful in predicting crack-growth rates and fracture strengths of surface- and corner-cracked components.

Author Information

Raju, IS
Analytical Services and Materials, Inc., Hampton, VA
Atluri, SN
Center for the Advancement of Computational Mechanics, Georgia Institute of Technology, Atlanta, GA
Newman, JC
NASA Langley Research Center, Hampton, VA
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Developed by Committee: E08
Pages: 297–316
DOI: 10.1520/STP18829S
ISBN-EB: 978-0-8031-5081-2
ISBN-13: 978-0-8031-1250-6