Fiber fracture during the consolidation of metal matrix composites

Groves, J.F.; Elzey, D. M.; Wadley, H.N.G.

doi:10.1016/0956-7151(94)90034-5

Cited by 46 publications

(5 citation statements)

References 11 publications

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“…This probably occurred during processing. Groves et al [37] suggest that fibre fracture during consolidation is influenced by the fibre waviness, strain rate of the pressing operation and the roughness of the titanium foils.…”

Section: Initial Thermal Residual Strainsmentioning

confidence: 99%

Interfacial shear strength behaviour of Ti/SiC metal matrix composites at room and elevated temperature

2010

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Section: Initial Thermal Residual Strainsmentioning

confidence: 99%

Interfacial shear strength behaviour of Ti/SiC metal matrix composites at room and elevated temperature

2010

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“…[7], we ignore any work hardening (which should be small during hot pressing) and the 15 pct stress-state hardening normally associated with plane-strain deformation of a plastically isotropic metal in the hot-press die. In assuming the matrix yield stress in Eq.…”

Section: Analysis: Consolidation Conditions For Matrix Flowmentioning

confidence: 99%

“…[9], we implicitly assumed the fibers to be loaded to their fracture strength, f . [7] and [8]. As a result, near the ends of the composite panel, the strength of the composite varies with position such that the composite flow stress, c , increases as a function of distance from the panel end.…”

Section: Analysis: Consolidation Conditions For Matrix Flowmentioning

confidence: 99%

“…This problem can usually be traced to one or both of two processing-induced damage effects: fiber strength degradation and fiber fragmentation. During hot pressing, it is well known that fibers may fragment as a result of fiber bending caused by the combination of the applied pressure and the presence of asperities, which result from powder particles, [7,8,11] monotape profiles, [7,8,10,11] or cross-weave wires in a foil/fiber/foil layup. [6][7][8][9][10] Fiber fragmentation most commonly occurs during composite consolidation using hot pressing, which is a common MMC processing procedure.…”

Section: Introductionmentioning

confidence: 99%

“…[6][7][8][9][10] Fiber fragmentation most commonly occurs during composite consolidation using hot pressing, which is a common MMC processing procedure. [7][8][9][10][11][12] Although fiber bending is usually observed when fiber fragmentation occurs, there have been observations of consolidation-induced fiber breakage in which the broken fibers appear straight with no indication of bending. [8,10] Fiber fragmentation due to these bending-induced incidents have been thoroughly examined and analyzed.…”

Section: Introductionmentioning

confidence: 99%

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Fiber fragmentation during processing of metallic matrix composites

Gorey

Koss

Hellmann

1998

Metall Mater Trans A

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Fiber fragmentation is a problem frequently encountered during the processing of metallic matrix composites. In this study, we examine the fragmentation of continuous fibers during a common composite consolidation process based on hot pressing in an open-ended channel die with fibers aligned parallel to the die walls. During the latter stages of consolidation, flow of the matrix along the die cavity may occur such that the resulting load transfer to the fibers can cause their fracture even in the absence of bending. This study analyzes the combination of conditions necessary for both matrix flow along the die cavity and the shear-lag loading of the fibers to a level that causes fragmentation. In order to validate the analysis, we model the fragmentation of fibers during elevated temperature hot pressing of Ni-base composites by the room-temperature consolidation of degraded sapphire fibers in a tin matrix. The observed fiber fragmentation behavior is in good agreement with theoretical predictions. The analysis also indicates that this mode of fiber fragmentation is confined either to low volume-fraction fiber composites or to the ends of panels of high volume-fraction fiber composites.

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