The effect of transverse compressive stresses on tensile failure of carbon fibre/epoxy composites composites

Tamas Rev; Michael R Wisnom; Xiaodong Xu; Gergely Czel

doi:10.1016/j.compositesa.2022.106894

The effect of transverse compressive stresses on tensile failure of carbon fibre/epoxy composites composites

Tamas Rev^*, Michael R Wisnom, Xiaodong Xu, Gergely Czel

^*Corresponding author for this work

Bristol Composites Institute

Research output: Contribution to journal › Article (Academic Journal) › peer-review

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Abstract

A novel test configuration has been developed to induce combined stress-states of in-plane longitudinal tension and transverse compression in thin-ply, unidirectional (UD) composite layers. Three different multi-directional laminates have been designed incorporating UD carbon/epoxy plies embedded in angle-ply blocks of the same material. The scissoring deformation of the angle-ply blocks induces transverse compression in the central UD layers when the composite is strained in the 0° fibre direction. The amount of transverse
compressive stress was estimated from the measured surface strain of the laminates to be up to about 140 MPa. Negligible effect was found on the tensile failure strain despite the very high in-plane transverse compressive strains generated in the laminates. These were much higher than those typically attained in multi-directional laminates, exceeding the strain at which compressive failure would occur in any 90° plies. The results of this study suggest that in practice fibre direction tensile failure is unlikely to be significantly affected by transverse compressive stresses.

Original language	English
Article number	106894
Number of pages	9
Journal	Composites Part A: Applied Science and Manufacturing
Volume	156
Early online date	21 Feb 2022
DOIs	https://doi.org/10.1016/j.compositesa.2022.106894
Publication status	Published - 1 May 2022

Bibliographical note

Funding Information:
This work was partly supported by the Engineering and Physical Sciences Research Council through the EPSRC Centre for Doctoral Training in Advanced Composites for Innovation and Science (grant number EP/L016028/1). This work was also supported by the UK Engineering and Physical Sciences Research Council (EPSRC) Programme Grant EP/I02946X/1 on High Performance Ductile Composite Technology in collaboration with Imperial College London, UK. Gergely Czél acknowledges the National Research, Development and Innovation Office (NRDI, Hungary) grant OTKA FK 131882 and he is also grateful for funding through the Premium Postdoctoral Fellowship Programme of the Hungarian Academy of Sciences. The data required to support the conclusions are provided within the paper.

Publisher Copyright:
© 2022 Elsevier Ltd

Keywords

Laminates
Strength
Multi-axial loading
Thin-ply

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title = "The effect of transverse compressive stresses on tensile failure of carbon fibre/epoxy composites composites",

abstract = "A novel test configuration has been developed to induce combined stress-states of in-plane longitudinal tension and transverse compression in thin-ply, unidirectional (UD) composite layers. Three different multi-directional laminates have been designed incorporating UD carbon/epoxy plies embedded in angle-ply blocks of the same material. The scissoring deformation of the angle-ply blocks induces transverse compression in the central UD layers when the composite is strained in the 0° fibre direction. The amount of transverse compressive stress was estimated from the measured surface strain of the laminates to be up to about 140 MPa. Negligible effect was found on the tensile failure strain despite the very high in-plane transverse compressive strains generated in the laminates. These were much higher than those typically attained in multi-directional laminates, exceeding the strain at which compressive failure would occur in any 90° plies. The results of this study suggest that in practice fibre direction tensile failure is unlikely to be significantly affected by transverse compressive stresses.",

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author = "Tamas Rev and Wisnom, \{Michael R\} and Xiaodong Xu and Gergely Czel",

note = "Funding Information: This work was partly supported by the Engineering and Physical Sciences Research Council through the EPSRC Centre for Doctoral Training in Advanced Composites for Innovation and Science (grant number EP/L016028/1). This work was also supported by the UK Engineering and Physical Sciences Research Council (EPSRC) Programme Grant EP/I02946X/1 on High Performance Ductile Composite Technology in collaboration with Imperial College London, UK. Gergely Cz{\'e}l acknowledges the National Research, Development and Innovation Office (NRDI, Hungary) grant OTKA FK 131882 and he is also grateful for funding through the Premium Postdoctoral Fellowship Programme of the Hungarian Academy of Sciences. The data required to support the conclusions are provided within the paper. Publisher Copyright: {\textcopyright} 2022 Elsevier Ltd",

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AU - Wisnom, Michael R

AU - Xu, Xiaodong

AU - Czel, Gergely

N1 - Funding Information: This work was partly supported by the Engineering and Physical Sciences Research Council through the EPSRC Centre for Doctoral Training in Advanced Composites for Innovation and Science (grant number EP/L016028/1). This work was also supported by the UK Engineering and Physical Sciences Research Council (EPSRC) Programme Grant EP/I02946X/1 on High Performance Ductile Composite Technology in collaboration with Imperial College London, UK. Gergely Czél acknowledges the National Research, Development and Innovation Office (NRDI, Hungary) grant OTKA FK 131882 and he is also grateful for funding through the Premium Postdoctoral Fellowship Programme of the Hungarian Academy of Sciences. The data required to support the conclusions are provided within the paper. Publisher Copyright: © 2022 Elsevier Ltd

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N2 - A novel test configuration has been developed to induce combined stress-states of in-plane longitudinal tension and transverse compression in thin-ply, unidirectional (UD) composite layers. Three different multi-directional laminates have been designed incorporating UD carbon/epoxy plies embedded in angle-ply blocks of the same material. The scissoring deformation of the angle-ply blocks induces transverse compression in the central UD layers when the composite is strained in the 0° fibre direction. The amount of transverse compressive stress was estimated from the measured surface strain of the laminates to be up to about 140 MPa. Negligible effect was found on the tensile failure strain despite the very high in-plane transverse compressive strains generated in the laminates. These were much higher than those typically attained in multi-directional laminates, exceeding the strain at which compressive failure would occur in any 90° plies. The results of this study suggest that in practice fibre direction tensile failure is unlikely to be significantly affected by transverse compressive stresses.

AB - A novel test configuration has been developed to induce combined stress-states of in-plane longitudinal tension and transverse compression in thin-ply, unidirectional (UD) composite layers. Three different multi-directional laminates have been designed incorporating UD carbon/epoxy plies embedded in angle-ply blocks of the same material. The scissoring deformation of the angle-ply blocks induces transverse compression in the central UD layers when the composite is strained in the 0° fibre direction. The amount of transverse compressive stress was estimated from the measured surface strain of the laminates to be up to about 140 MPa. Negligible effect was found on the tensile failure strain despite the very high in-plane transverse compressive strains generated in the laminates. These were much higher than those typically attained in multi-directional laminates, exceeding the strain at which compressive failure would occur in any 90° plies. The results of this study suggest that in practice fibre direction tensile failure is unlikely to be significantly affected by transverse compressive stresses.

KW - Laminates

KW - Strength

KW - Multi-axial loading

KW - Thin-ply

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DO - 10.1016/j.compositesa.2022.106894

M3 - Article (Academic Journal)

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JO - Composites Part A: Applied Science and Manufacturing

JF - Composites Part A: Applied Science and Manufacturing

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ER -

The effect of transverse compressive stresses on tensile failure of carbon fibre/epoxy composites composites

Abstract

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