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In predicting crack growth behavior under arbitrary spectrum loads, one must consider the effects of tensile and compressive overloads to retard and accelerate growth. There are two major categories of crack growth models for prediction of retardation and acceleration behavior: yield zone models and closure models. Capabilities and limitations of these models are discussed with respect to accuracy in predicting various growth behaviors.
Yielding at notches or holes can significantly alter the retardation behavior caused solely by crack-tip plasticity. Careful analysis of notch plasticity is required to predict behavior of flaws growing from notches under spectrum loading.
crack propagation, plastic deformation, fatigue (materials), spectrum loads, retardation, mathematical models
Technical specialist, Structural Research, McDonnell Aircraft Co., McDonnell Douglas Corp., St. Louis, MO