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    Fatigue Crack Growth Thresholds, Endurance Limits, and Design

    Newman JC, Piascik RS
    Published: 2000

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    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 ΔKth 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.

    Table of Contents

    Mechanisms and Modeling of Near-Threshold Fatigue Crack Propagation

    The Significance of the Intrinsic Threshold — What Is New?

    On the Significance of Crack Tip Shielding in Fatigue Threshold — Theoretical Relations and Experimental Implications

    Effects of Kmax on Fatigue Crack Growth Threshold in Aluminum Alloys

    Fatigue Crack Growth Threshold Concept and Test Results for Al- and Ti-Alloys

    Resistance Curves for the Threshold of Fatigue Crack Propagation in Particle Reinforced Aluminium Alloys

    An Indirect Technique for Determining Closure-Free Fatigue Crack Growth Behavior

    Effect of an Overload on the Threshold Level of Ti-6-22-22

    Relation Between Endurance Limits and Thresholds in the Field of Gigacycle Fatigue

    A Size Effect on the Fatigue Crack Growth Rate Threshold of Alloy 718

    Effect of Geometry and Load History on Fatigue Crack Growth in Ti-62222

    Increases in Fatigue Crack Growth Rate and Reductions in Fatigue Strength due to Periodic Overstrains in Biaxial Fatigue Loading

    Analysis of Fatigue Crack Closure During Simulated Threshold Testing

    Analyses of Fatigue Crack Growth and Closure Near Threshold Conditions for Large-Crack Behavior

    The Mechanics of Moderately Stressed Cracks

    Pitfalls to Avoid in Threshold Testing and its Interpretation

    Use of Small Fatigue Crack Growth Analysis in Predicting the S-N Response of Cast Aluminum Alloys

    Prediction of Fatigue Limits of Engineering Components Containing Small Defects

    Corrosion Fatigue Crack Growth Thresholds for Cast Nickel-Aluminum Bronze and Welds

    Mean Stress and Environmental Effects on Near-Threshold Fatigue Crack Propagation on a Ti6246 Alloy at Room Temperature and 500°C

    Component Design: The Interface Between Threshold and Endurance Limit

    Near-Threshold Fatigue Strength of a Welded Steel Bridge Detail

    Fatigue Crack Growth Thresholds Measurements in Structural Materials

    Endurance Limit Design of Spheroidal Graphite Cast Iron Components Based on Natural Defects

    Author Index

    Subject Index

    Committee: E08

    DOI: 10.1520/STP1372-EB

    ISBN-EB: 978-0-8031-5424-7

    ISBN-13: 978-0-8031-2624-4