Chapter 6. Crack Propagation: Microstructural Aspects

  1. Prof. Dr.-Ing. Ulrich Krupp

Published Online: 29 MAR 2007

DOI: 10.1002/9783527610686.ch6

Fatigue Crack Propagation in Metals and Alloys: Microstructural Aspects and Modelling Concepts

Fatigue Crack Propagation in Metals and Alloys: Microstructural Aspects and Modelling Concepts

How to Cite

Krupp, U. (2007) Crack Propagation: Microstructural Aspects, in Fatigue Crack Propagation in Metals and Alloys: Microstructural Aspects and Modelling Concepts, Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, Germany. doi: 10.1002/9783527610686.ch6

Author Information

  1. Faculty of Engineering and Computer Science, FH Osnabrück - University of Applied Sciences, Albrechtstrasse 30, 49076 Osnabrück, Germany

Publication History

  1. Published Online: 29 MAR 2007
  2. Published Print: 23 FEB 2007

ISBN Information

Print ISBN: 9783527315376

Online ISBN: 9783527610686

SEARCH

Keywords:

  • fatigue crack propagation;
  • metal;
  • alloy;
  • microstructural aspects;
  • microstructurally short fatigue cracks;
  • transgranular crack propagation;
  • crack-closure effects;
  • overloads;
  • long fatigue cracks;
  • intercrystalline crack propagation;
  • elevated temperatures;
  • dynamic embrittlement

Summary

This chapter contains sections titled:

  • Special Features of the Propagation of Microstructurally Short Fatigue Cracks

    • Definition of Short and Long Cracks

  • Transgranular Crack Propagation

    • Crystallographic Crack Propagation: Interactions with Grain Boundaries

    • Mode I Crack Propagation Governed by Cyclic Crack-Tip Blunting

    • Influence of Grain Size, Second Phases and Precipitates on the Propagation Behavior of Microstructurally Short Fatigue Cracks

  • Significance of Crack-Closure Effects and Overloads

    • General Idea of Crack Closure During Fatigue-Crack Propagation

    • Plasticity-Induced Crack Closure

    • Influence of Overloads in Plasticity-Induced Crack Closure

    • Roughness-Induced Crack Closure

    • Oxide- and Transformation-Induced Crack Closure

    • ΔK*/K*max Thresholds: An Alternative to the Crack-Closure Concept

    • Development of Crack Closure in the Short Crack Regime

  • Short and Long Fatigue Cracks: The Transition from Mode II to Mode I Crack Propagation

    • Development of the Crack Aspect Ratio a/c

    • Coalescence of Short Cracks

  • Intercrystalline Crack Propagation at Elevated Temperatures: The Mechanism of Dynamic Embrittlement

    • Environmentally Assisted Intercrystalline Crack Propagation in Nickel-Based Superalloys: Possible Mechanisms

    • Mechanism of Dynamic Embrittlement as a Generic Phenomenon: Examples

    • Oxygen-Induced Intercrystalline Crack Propagation: Dynamic Embrittlement of Alloy 718

    • Increasing the Resistance to Intercrystalline Crack Propagation by Dynamic Embrittlement: Grain-Boundary Engineering