Effects of reinforcement morphology on the fatigue and fracture behavior of MoSi{sub 2}/Nb composites

Journal Article · Wed May 01 04:00:00 EDT 1996 · Acta Materialia

DOI:https://doi.org/10.1016/1359-6454(95)00272-3· OSTI ID:247955

Soboyejo, W O; Ye, F; Chen, L C; Bahtishi, N ^[1]; Schwartz, D S; Lederich, R J ^[2]

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1. Ohio State Univ., Columbus, OH (United States). Dept. of Materials Science and Engineering
2. 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

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
CRACK PROPAGATION
CRACKS
FATIGUE
FIBERS
FRACTURE MECHANICS
FRACTURE PROPERTIES
INTERFACES
INTERMETALLIC COMPOUNDS
LAMELLAE
MATHEMATICAL MODELS
MICROSTRUCTURE
MOLYBDENUM SILICIDES
NIOBIUM
PARTICULATES
PREDICTION EQUATIONS