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Some recent results from investigations in nonlinear fracture mechanics centering about the J-integral are utilized to derive a low-cycle fatigue relationship. The derived relationship has the form of the well-known Coffin-Manson equation, but differs from it in that the controlling variable is predicted to be applied strain energy density rather than plastic strain range. This predicted controlling variable appears to closely parallel several energy-related functions proposed during the past 15 year period.
crack propagation, fractures (materials), stresses, cracks, plastic properties
Manager, Mechanics of Materials, Materials and Processes Laboratory, General Electric Company, Schenectady, N.Y.