The strength of metal matrix composites Reinforced with Randomly Oriented Discontinuous Fibers

Baxter, William J.

doi:10.1007/bf02646122

Cited by 66 publications

(19 citation statements)

References 16 publications

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“…In situ synthesized TiB whiskers can also act as nucleation site for (Ti,Al) 2 Cu and AlCu 2 Ti grains refinement [15,16]. Furthermore, brazed joints are reinforced when TiB whisker reaches the critical size [17].…”

Section: Methodsmentioning

confidence: 99%

Improving the strength of brazed joints with in situ synthesized TiB whiskers

Yang

Lin

et al. 2011

Journal of Alloys and Compounds

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Section: Methodsmentioning

confidence: 99%

Improving the strength of brazed joints with in situ synthesized TiB whiskers

Yang

Lin

et al. 2011

Journal of Alloys and Compounds

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“…[20] The change in tensile strength as a function of off-axis angle was calculated using an equation proposed by Baxter. [21] For a random orientation, the offaxis angle was varied from 0 to 90 deg, and the mean strength was calculated assuming a perfectly random distribution of fiber. Figure 10(b) suggested that the tensile strength of 476 MPa measured in the present Cu composite with the CNF volume fraction of approximately 13 pct could not be obtained with a random orientation of CNFs.…”

Section: Discussionmentioning

confidence: 99%

Tensile behavior of carbon nano-fiber-reinforced Cu composite using the liquid infiltration process

Jang

Kim

Jung

et al. 2005

Metall Mater Trans A

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A carbon nano-fiber (CNF)-reinforced Cu composite was fabricated by the liquid infiltration process, and the tensile behavior of the fabricated composite was evaluated. For the unidirectional alignment of the severely entangled CNFs, the mechanical drawing process was utilized. The bundle of drawn Cu tubes, compacted with unidirectionally aligned CNFs, was placed on the specially designed mold. The mold was subsequently canned, degassed, evacuated, heated at 1100 °C for 10 minutes in the electric furnace to liquefy the Cu, and, finally, transferred to the press. The optical and scanning electron microscope (SEM) micrographic observations of the final product demonstrated that, even though the CNFs were not uniformly distributed throughout the specimen due to the molten metal flow during the melting process, the local unidirectionality was preserved in those areas where CNFs were densely packed. Tensile test results showed that a twofold increase in tensile strength was obtained with an approximately 13 pct CNF reinforcement, despite there being no known bonding between CNFs and Cu. The transmission electron microscope (TEM) observations demonstrated that the C atoms in the CNF were forced into the Cu matrix, which caused the roughening of the CNF surface and the supersaturated solutionization of the Cu matrix in the vicinity of the CNF during liquid processing. A strong mechanical interlocking was believed to exist between the CNF and Cu due to the roughened surface of the CNF and the stress field developed around the CNF as a result of the supersaturated solutionization of the Cu matrix. This mechanical bonding mechanism appeared to be unique in the composite system reinforced with nano fibers produced by the liquid infiltration process.

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“…Here, we also see fibres that have been bent and demonstrate curvature, although these curved fibres still appear to be debonding in larger bundles of fibres, rather than individually. This is because both ends of the short fibres cannot be fully stressed in comparison with long fibres, leading to fibre bundling and further debonding [70]. This is due to the complex nature of the flexural test, which ensures that a combination of tension and compression is present, leading to out of plane oriented-fibre bundles to debond [69].…”

Section: Scanning Electron Microscopy Analysismentioning

confidence: 99%

Finite Element Analysis and Experimental Characterisation of SMC Composite Car Hood Specimens under Complex Loadings

2018

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Composite materials have recently been of particular interest to the automotive industry due to their high strength-to-weight ratio and versatility. Among the different composite materials used in mass-produced vehicles are sheet moulded compound (SMC) composites, which consist of random fibres, making them inexpensive candidates for non-structural applications in future vehicles. In this work, SMC composite materials were prepared with varying fibre orientations and volume fractions (25% and 45%) and subjected to a series of uniaxial tensile and flexural bending tests at a strain rate of 3 × 10−3 s−1. Tensile strength as well as failure strain increased with the increasing fibre volume fraction for the uniaxial tests. Flexural strength was found to also increase with increasing fibre percentage; however, failure displacement was found to decrease. The two material directions studied—longitudinal and transverse—showed superior strength and failure strain/displacement in the transverse direction. The experimental results were then used to create a finite element model to describe the deformation behaviour of SMC composites. Tensile results were first used to create and calibrate the model; then, the model was validated with flexural experimental results. The finite element model closely predicted both SMC volume fraction samples, predicting the failure force and displacement with less than 3.5% error in the lower volume fraction tests, and 6.6% error in the higher volume fraction tests.

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The strength of metal matrix composites Reinforced with Randomly Oriented Discontinuous Fibers

Cited by 66 publications

References 16 publications

Improving the strength of brazed joints with in situ synthesized TiB whiskers

Improving the strength of brazed joints with in situ synthesized TiB whiskers

Tensile behavior of carbon nano-fiber-reinforced Cu composite using the liquid infiltration process

Finite Element Analysis and Experimental Characterisation of SMC Composite Car Hood Specimens under Complex Loadings

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