Thermal expansion behaviour of ultra-high modulus carbon fibre reinforced magnesium composite during thermal cycling

Russell-Stevens, M.; Todd, Richard I.; Papakyriacou, M.

doi:10.1007/s10853-006-0318-y

Cited by 13 publications

(5 citation statements)

References 24 publications

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“…Since the filler region does not prevent expansion and the tank wall can expand freely, the mechanical strain M remains at zero, resulting in the total strain of the tank being solely that due to thermal strain, as shown in Eq. (13). Strain interaction with the firebrick and ceramic sections is neglected as these layers are composed of loosely connected blocks, and are therefore unable to provide structural support to the filler region.…”

Section: (B) Boundary Conditionsmentioning

confidence: 99%

“…Thermal ratcheting is an important design issue in multiple applications [12,13], but has not been extensively studied for dual-media thermoclines, in which thermal ratcheting can occur when the system undergoes successive charge and discharge cycles. As the tank heats up during the charge cycle, its internal volume increases and the filler particles settle lower to fill the additional volume created by the thermal expansion; as the tank cools down during the discharge cycle, however, the filler particles cannot be displaced upward due to gravity, inter-particle friction and resistance from particle packing.…”

Section: Introductionmentioning

confidence: 99%

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An integrated thermal and mechanical investigation of molten-salt thermocline energy storage

2011

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Section: (B) Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An integrated thermal and mechanical investigation of molten-salt thermocline energy storage

2011

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“…Pitch‐based CF have a TC as high as 1000 W mK −1 , two orders of magnitude higher than the typical polyacrylonitrile‐based CF used in engineering. Their suitability as a filler for metal matrix composites was shown in several studies and applications , however, in most cases with unidirectional distribution of CF, leading to high TC and low CTE along one axis . Most previous studies treated the performance of Solvay P100S fibres , whose production was stopped a decade ago.…”

Section: Introductionmentioning

confidence: 99%

Thermal properties of metal matrix composites with planar distribution of carbon fibres

Oddone

Reich

2017

Physica Rapid Research Ltrs

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High thermal conductivity (TC) and a tunable coefficient of thermal expansion are essential properties for heat management materials operating in a wide temperature range. We combine both properties in a composite with a low-density metal matrix reinforced with pitch-based carbon fibres. The thermal conductivity of the metal matrix was increased by 50%, the thermal expansion coefficient was reduced by a factor of five. The samples were produced by powder metallurgy and have a planar random distribution of fibres, leading to high performance in two dimensions.Surface of a metal matrix composite with 50% carbon fibre (CF) strengthening (optical microscope, 20Â magnification). RapidResearch Letter 1700090 (4 of 5) V. Oddone and S. Reich: Thermal properties of metal matrix composites ß

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“…If the different thermal expansion is not absorbed by flexible components, the induced stress will weaken the structure and may cause failure. Carbon based particles and fibers are widely used as filler in metal matrices for reducing the CTE [3,4,13,[5][6][7][8][9][10][11][12]. Carbon fibers and carbon nanotubes have a low or negative CTE along the fiber direction, graphene and graphite flakes along the crystal lattice plane.…”

Section: Introductionmentioning

confidence: 99%

Understanding the negative thermal expansion in planar graphite–metal composites

2018

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The addition of graphitic fibers and flakes as fillers is commonly used to control the thermal expansion of metals. Sintered metal matrix composites with a planar distribution of graphite flakes show a low or negative thermal expansion coefficient perpendicular to the orientation plane of the graphite (z-CTE). Since the metal matrix has a positive isotropic expansion and graphite has a high z-CTE, this effect cannot be explained by a simple model of stapled metalgraphite layers. Instead, a mechanical interaction between graphite and matrix must be considered. With neutron scattering measurements we show that there is little or no strain of the graphite flakes caused by the matrix, which can be explained by the high modulus of graphite. Instead, we suggest that a macroscopic crumpling of the flakes is responsible for the low z-CTE of the composite. The crumpled flakes are thicker at low temperature and get stretched and flattened by the expanding matrix at high temperature, explaining the reduction in the thermal expansion across the orientation plane.

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Thermal expansion behaviour of ultra-high modulus carbon fibre reinforced magnesium composite during thermal cycling

Cited by 13 publications

References 24 publications

An integrated thermal and mechanical investigation of molten-salt thermocline energy storage

An integrated thermal and mechanical investigation of molten-salt thermocline energy storage

Thermal properties of metal matrix composites with planar distribution of carbon fibres

Understanding the negative thermal expansion in planar graphite–metal composites

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