Exploration of irreversible residual stresses in a carbon/epoxy composite

Johnny Jakobsen; Fahimeh Shakibapour

doi:10.1088/1757-899X/942/1/012018

Exploration of irreversible residual stresses in a carbon/epoxy composite

Johnny Jakobsen^*
, Fahimeh Shakibapour

^*Corresponding author for this work

Research output: Contribution to book/anthology/report/conference proceeding › Article in proceeding › Research › peer-review

Abstract

Residual stresses in composite material may rise from several sources; difference in thermal straining between fibre and matrix, chemical shrinkage of the matrix material. The presented paper explores an irreversible Eigen-strain in the material which is shown to change and be removed by a thermal treatment above the Tg of the matrix material. This has been observed though TMA measurements of a carbon/epoxy unidirectional sample. The local Eigen-strain is translated into stresses using a visco-elastic constitutive relation. Further exploration indicates that cooling rate influence the generation of residual stresses in the material.

Original language	English
Title of host publication	41st Risoe Symposium : Materials and design for next generation wind turbine blades
Volume	942
Publisher	IOP Publishing
Publication date	2020
Edition	1
DOIs	https://doi.org/10.1088/1757-899X/942/1/012018
Publication status	Published - 2020
Event	Risø International Symposium on Materials Science 2020: Materials and Design for Next Generation Wind Turbine Blades - Roskilde, Denmark Duration: 7 Sept 2020 → 10 Sept 2020 Conference number: 41

Conference

Conference	Risø International Symposium on Materials Science 2020
Number	41
Country/Territory	Denmark
City	Roskilde
Period	07/09/2020 → 10/09/2020

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10.1088/1757-899X/942/1/012018Licence: CC BY 3.0

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title = "Exploration of irreversible residual stresses in a carbon/epoxy composite",

abstract = "Residual stresses in composite material may rise from several sources; difference in thermal straining between fibre and matrix, chemical shrinkage of the matrix material. The presented paper explores an irreversible Eigen-strain in the material which is shown to change and be removed by a thermal treatment above the Tg of the matrix material. This has been observed though TMA measurements of a carbon/epoxy unidirectional sample. The local Eigen-strain is translated into stresses using a visco-elastic constitutive relation. Further exploration indicates that cooling rate influence the generation of residual stresses in the material.",

keywords = "Residual Stresses, Viscoelastic Materials, Composite material",

author = "Johnny Jakobsen and Fahimeh Shakibapour",

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language = "English",

volume = "942",

booktitle = "41st Risoe Symposium",

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T1 - Exploration of irreversible residual stresses in a carbon/epoxy composite

AU - Jakobsen, Johnny

AU - Shakibapour, Fahimeh

N1 - Conference code: 41

PY - 2020

Y1 - 2020

N2 - Residual stresses in composite material may rise from several sources; difference in thermal straining between fibre and matrix, chemical shrinkage of the matrix material. The presented paper explores an irreversible Eigen-strain in the material which is shown to change and be removed by a thermal treatment above the Tg of the matrix material. This has been observed though TMA measurements of a carbon/epoxy unidirectional sample. The local Eigen-strain is translated into stresses using a visco-elastic constitutive relation. Further exploration indicates that cooling rate influence the generation of residual stresses in the material.

AB - Residual stresses in composite material may rise from several sources; difference in thermal straining between fibre and matrix, chemical shrinkage of the matrix material. The presented paper explores an irreversible Eigen-strain in the material which is shown to change and be removed by a thermal treatment above the Tg of the matrix material. This has been observed though TMA measurements of a carbon/epoxy unidirectional sample. The local Eigen-strain is translated into stresses using a visco-elastic constitutive relation. Further exploration indicates that cooling rate influence the generation of residual stresses in the material.

KW - Residual Stresses

KW - Viscoelastic Materials

KW - Composite material

UR - https://www.scopus.com/pages/publications/85096494810

U2 - 10.1088/1757-899X/942/1/012018

DO - 10.1088/1757-899X/942/1/012018

M3 - Article in proceeding

VL - 942

BT - 41st Risoe Symposium

PB - IOP Publishing

T2 - Risø International Symposium on Materials Science 2020

Y2 - 7 September 2020 through 10 September 2020

ER -

Exploration of irreversible residual stresses in a carbon/epoxy composite

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