SEDL / STP / STP1189-EB / STP24273S

Growth of Surface Cracks During Large Elastic-Plastic Loading Cycles

McClung, RC
Senior research engineer, manager, research engineer, and senior engineering technologist, Southwest Research Institute, San Antonio, TX

Hudak, SJ
Senior research engineer, manager, research engineer, and senior engineering technologist, Southwest Research Institute, San Antonio, TX

Bartlett, ML
Senior research engineer, manager, research engineer, and senior engineering technologist, Southwest Research Institute, San Antonio, TX

FitzGerald, JH
Senior research engineer, manager, research engineer, and senior engineering technologist, Southwest Research Institute, San Antonio, TX

Pages: 19    Published: Jan 1993

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Abstract

Thin Inconel 718 plates with deep elliptical surface flaws are subjected to large loading cycles under both load and displacement control. Closed-form estimates of the J-integral for surface flaws in finite thickness plates are derived with a modified reference stress method and compared with recent elastic-plastic finite element results. A J-resistance curve for the surface-cracked configuration is developed and compared with data from thick compact tension specimens. Special attention is given to the apparent relationship between ductile tearing and low-cycle fatigue crack growth mechanisms and rates.