Shear properties of a carbon/carbon composite with non-woven felt and continuous fibre reinforcement layers

L R Bradley; C R Bowen; B McEnaney; D C Johnson

doi:10.1016/j.carbon.2007.06.072

Shear properties of a carbon/carbon composite with non-woven felt and continuous fibre reinforcement layers

L R Bradley, C R Bowen, B McEnaney, D C Johnson

Department of Mechanical Engineering

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37 Citations (SciVal)

Abstract

This study examines the shear properties of a 2D PAN-CVI carbon/carbon composite whose reinforcement layers are formed from a non-woven duplex cloth comprising a continuous fibre layer needled to a short fibre felt layer. Composites of three lay-ups were tested in several orientations using the Iosipescu (V-notched beam) shear test. Material anisotropy means that shear failure stresses and shear moduli are required in several orientations for structural analysis. It was necessary to mitigate the effect of specimen twisting by using strain gages on both sides of the specimens. The approximate ranges of measured shear failure stresses were 30-45 MPa in-plane and 8-22 MPa interlaminar. Shear moduli ranged between 6-16 GPa in-plane and 1-3 GPa interlaminar. While the presence of flaws in these composites leads to scatter in properties, the effect of bulk density on interlaminar properties was clearly observed.

Original language	English
Pages (from-to)	2178-2187
Number of pages	10
Journal	Carbon
Volume	45
Issue number	11
DOIs	https://doi.org/10.1016/j.carbon.2007.06.072
Publication status	Published - 2007

Keywords

Nonwoven fabrics
Anisotropy
Carbon carbon composites
Elastic moduli
Stresses
Strain

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10.1016/j.carbon.2007.06.072

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title = "Shear properties of a carbon/carbon composite with non-woven felt and continuous fibre reinforcement layers",

abstract = "This study examines the shear properties of a 2D PAN-CVI carbon/carbon composite whose reinforcement layers are formed from a non-woven duplex cloth comprising a continuous fibre layer needled to a short fibre felt layer. Composites of three lay-ups were tested in several orientations using the Iosipescu (V-notched beam) shear test. Material anisotropy means that shear failure stresses and shear moduli are required in several orientations for structural analysis. It was necessary to mitigate the effect of specimen twisting by using strain gages on both sides of the specimens. The approximate ranges of measured shear failure stresses were 30-45 MPa in-plane and 8-22 MPa interlaminar. Shear moduli ranged between 6-16 GPa in-plane and 1-3 GPa interlaminar. While the presence of flaws in these composites leads to scatter in properties, the effect of bulk density on interlaminar properties was clearly observed.",

keywords = "Nonwoven fabrics, Anisotropy, Carbon carbon composites, Elastic moduli, Stresses, Strain",

author = "Bradley, {L R} and Bowen, {C R} and B McEnaney and Johnson, {D C}",

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doi = "10.1016/j.carbon.2007.06.072",

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pages = "2178--2187",

journal = "Carbon",

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TY - JOUR

T1 - Shear properties of a carbon/carbon composite with non-woven felt and continuous fibre reinforcement layers

AU - Bradley, L R

AU - Bowen, C R

AU - McEnaney, B

AU - Johnson, D C

PY - 2007

Y1 - 2007

N2 - This study examines the shear properties of a 2D PAN-CVI carbon/carbon composite whose reinforcement layers are formed from a non-woven duplex cloth comprising a continuous fibre layer needled to a short fibre felt layer. Composites of three lay-ups were tested in several orientations using the Iosipescu (V-notched beam) shear test. Material anisotropy means that shear failure stresses and shear moduli are required in several orientations for structural analysis. It was necessary to mitigate the effect of specimen twisting by using strain gages on both sides of the specimens. The approximate ranges of measured shear failure stresses were 30-45 MPa in-plane and 8-22 MPa interlaminar. Shear moduli ranged between 6-16 GPa in-plane and 1-3 GPa interlaminar. While the presence of flaws in these composites leads to scatter in properties, the effect of bulk density on interlaminar properties was clearly observed.

AB - This study examines the shear properties of a 2D PAN-CVI carbon/carbon composite whose reinforcement layers are formed from a non-woven duplex cloth comprising a continuous fibre layer needled to a short fibre felt layer. Composites of three lay-ups were tested in several orientations using the Iosipescu (V-notched beam) shear test. Material anisotropy means that shear failure stresses and shear moduli are required in several orientations for structural analysis. It was necessary to mitigate the effect of specimen twisting by using strain gages on both sides of the specimens. The approximate ranges of measured shear failure stresses were 30-45 MPa in-plane and 8-22 MPa interlaminar. Shear moduli ranged between 6-16 GPa in-plane and 1-3 GPa interlaminar. While the presence of flaws in these composites leads to scatter in properties, the effect of bulk density on interlaminar properties was clearly observed.

KW - Nonwoven fabrics

KW - Anisotropy

KW - Carbon carbon composites

KW - Elastic moduli

KW - Stresses

KW - Strain

UR - http://dx.doi.org/10.1016/j.carbon.2007.06.072

U2 - 10.1016/j.carbon.2007.06.072

DO - 10.1016/j.carbon.2007.06.072

M3 - Article

SN - 0008-6223

VL - 45

SP - 2178

EP - 2187

JO - Carbon

JF - Carbon

IS - 11

ER -

Shear properties of a carbon/carbon composite with non-woven felt and continuous fibre reinforcement layers

Abstract

Keywords

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