Effects of reinforcement morphology on the fatigue and fracture behavior of MoSi{sub 2}/Nb composites
- Ohio State Univ., Columbus, OH (United States). Dept. of Materials Science and Engineering
- McDonnell Douglas Corp., St. Louis, MO (United States)
The results of a systematic study of the effects of reinforcement morphology on the fatigue and fracture behavior of MoSi{sub 2}/Nb composites are discussed. These include experimental and analytical results obtained from studies of crack growth and crack-tip shielding mechanisms in composites reinforced with Nb particles, fibers and laminae. The crack-tip shielding contributions from crack bridging and crack-tip blunting in fiber-reinforced and laminated composites are analyzed using micromechanics models. Similarly, the toughening contributions from deflection by continuous tilting and twisting of cracks around the layered interfaces in particulate-reinforced composites are also assessed using fracture mechanics models. Linear superposition concepts are then used to obtain predictions of the overall toughening due to the different crack-tip shielding mechanisms. The paper highlights the need to control reinforcement morphology in the design of composites with improved fatigue and fracture resistance.
- OSTI ID:
- 247955
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 5 Vol. 44; ISSN XZ504Y; ISSN 1359-6454
- Country of Publication:
- United States
- Language:
- English
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