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Book Description: Leading experts provide 24 papers addressing four areas pertinent to fatigue crack growth thresholds: mechanisms, test procedures, analysis, and applications. Mechanisms: Three mechanisms that influence thresholds are discussed including: crack tip closure, environment, and Kmax effects. A simplistic four parameter model that describes FCG threshold behavior of elastic plastic materials is also presented. Test Procedures: Eight papers focus on loading and specimen type effects with research showing that the resistance curve (R curve) method to determine the threshold for fatigue crack growth should allow more reliable application of ?Kth values to engineering problems. Analysis: Three papers analyze the behavior of fatigue cracks in the threshold regime using several different analysis methods. These methods were the elastic plastic finite element method (FEM), the Dugdale type mode, the BCS (Bilby, Cottrell and Swinden) model, and a discrete dislocation model. Applications: Nine papers address applications of threshold concepts and endurance limits to aerospace and structural materials. The impact of a number of testing variables on the measurement of fatigue crack growth thresholds, in particular ASTM E 647, Test Method for Measurement of Fatigue Crack Growth Rates is also discussed.

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