Metallurgical Transactions A

, Volume 20, Issue 5, pp 897–908 | Cite as

Crack bridging by uncracked ligaments during fatigue-crack growth in SiC-reinforced aluminum-alloy composites

  • Jian Ku Shang
  • R. O. Ritchie
Mechanical Behavior


Micro-mechanisms of crack-tip shielding associated with the growth of fatigue cracks in metalmatrix composites are examined with specific emphasis on the role of crack bridging by uncracked ligaments. Simple analytical models are developed for such bridging induced by both overlapping cracks and by coplanar ligaments in the wake of the crack tip; the models are based on respective notions of a critical tensile strain or critical crack-opening displacement in the ligament. The predicted degree of shielding derived from these mechanisms is not large, but is found to be consistent with experimental observations in high-strength P/M aluminum alloys reinforced with 15 to 20 vol pct of SiC particulate.


Metallurgical Transaction Stress Intensity Crack Closure Uncracked Ligament Unreinforced Matrix Alloy 
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Copyright information

© The Minerals, Metals & Materials Society and ASM International 1989

Authors and Affiliations

  • Jian Ku Shang
    • 1
  • R. O. Ritchie
    • 1
  1. 1.Department of Materials Science and Mineral Engineering at the University of CaliforniaBerkeley

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