In-situ measurements of the load transferring shrinkage of thermosets used in composite materials for wind turbine blades

Lars Pilgaard Mikkelsen

doi:10.5075/epfl-298799_978-2-9701614-0-0

In-situ measurements of the load transferring shrinkage of thermosets used in composite materials for wind turbine blades

Lars Pilgaard Mikkelsen^*

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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Abstract

An experimental setup for in-situ measurement of the load transferring shrinkage during the curing process of thermosets is demonstrated. The experimental setup makes it possible to determine the load-transferring point and the resulting cure-induced strain for a specific material system during a specific cure profile. Measurements that make it possible to tailor the cure profile aiming for a low resulting residual stress in a composite material. The accuracy of the measurements of the cue-induced strain is validated through finite element simulations of the deformation of the embedded optical glass fiber containing a Fiber Bragg Grating deformation sensor. The simulations show that a minimum thickness of 2mm and the presence of a minimum of 10 mm embedded optical fibers on both sides of the Fiber Bragg Grating sensor are important for obtaining accurate strain measurements.

Original language	English
Title of host publication	Composites Meet Sustainability – Proceedings of the 20th European Conference on Composite Materials : Materials
Editors	Anastasios P. Vassilopoulos, Véronique Michaud
Number of pages	6
Volume	1
Place of Publication	Lausanne, Switzerland
Publisher	École Polytechnique Fédérale de Lausanne
Publication date	2022
Pages	218-223
ISBN (Electronic)	978-2-9701614-0-0
DOIs	https://doi.org/10.5075/epfl-298799_978-2-9701614-0-0
Publication status	Published - 2022
Event	20th European Conference on Composite Materials - Lausanne, Switzerland Duration: 26 Jun 2022 → 30 Jun 2022 Conference number: 20

Conference

Conference	20th European Conference on Composite Materials
Number	20
Country/Territory	Switzerland
City	Lausanne
Period	26/06/2022 → 30/06/2022

Keywords

Residual stress
Cure-kinetic
Fiber bragg gratings
Finite element model

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Manufacturing focus group, DTU Wind and Energy Systems
Mikkelsen, L. P. (Project Manager), Pierce, R. (Project Coordinator), Andersen, T. (PI), Haselbach, P. U. (PI), Semenov, S. (PI), Mortensen, U. A. (PI), Sarhadi, A. (PI), Markussen, M. (PI), Rojas, M. (PI), Rashvand, K. (PI) & Jørgensen, J. K. (PI)
01/01/2022 → …
Project: Research

Cite this

Mikkelsen, L. P. (2022). In-situ measurements of the load transferring shrinkage of thermosets used in composite materials for wind turbine blades. In A. P. Vassilopoulos, & V. Michaud (Eds.), Composites Meet Sustainability – Proceedings of the 20th European Conference on Composite Materials: Materials (Vol. 1, pp. 218-223). École Polytechnique Fédérale de Lausanne. https://doi.org/10.5075/epfl-298799_978-2-9701614-0-0

Mikkelsen, Lars Pilgaard. / In-situ measurements of the load transferring shrinkage of thermosets used in composite materials for wind turbine blades. Composites Meet Sustainability – Proceedings of the 20th European Conference on Composite Materials: Materials. editor / Anastasios P. Vassilopoulos ; Véronique Michaud. Vol. 1 Lausanne, Switzerland : École Polytechnique Fédérale de Lausanne, 2022. pp. 218-223

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abstract = "An experimental setup for in-situ measurement of the load transferring shrinkage during the curing process of thermosets is demonstrated. The experimental setup makes it possible to determine the load-transferring point and the resulting cure-induced strain for a specific material system during a specific cure profile. Measurements that make it possible to tailor the cure profile aiming for a low resulting residual stress in a composite material. The accuracy of the measurements of the cue-induced strain is validated through finite element simulations of the deformation of the embedded optical glass fiber containing a Fiber Bragg Grating deformation sensor. The simulations show that a minimum thickness of 2mm and the presence of a minimum of 10 mm embedded optical fibers on both sides of the Fiber Bragg Grating sensor are important for obtaining accurate strain measurements. ",

keywords = "Residual stress, Cure-kinetic, Fiber bragg gratings, Finite element model",

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Mikkelsen, LP 2022, In-situ measurements of the load transferring shrinkage of thermosets used in composite materials for wind turbine blades. in AP Vassilopoulos & V Michaud (eds), Composites Meet Sustainability – Proceedings of the 20th European Conference on Composite Materials: Materials. vol. 1, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland, pp. 218-223, 20th European Conference on Composite Materials, Lausanne, Switzerland, 26/06/2022. https://doi.org/10.5075/epfl-298799_978-2-9701614-0-0

In-situ measurements of the load transferring shrinkage of thermosets used in composite materials for wind turbine blades. / Mikkelsen, Lars Pilgaard.
Composites Meet Sustainability – Proceedings of the 20th European Conference on Composite Materials: Materials. ed. / Anastasios P. Vassilopoulos; Véronique Michaud. Vol. 1 Lausanne, Switzerland: École Polytechnique Fédérale de Lausanne, 2022. p. 218-223.

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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AB - An experimental setup for in-situ measurement of the load transferring shrinkage during the curing process of thermosets is demonstrated. The experimental setup makes it possible to determine the load-transferring point and the resulting cure-induced strain for a specific material system during a specific cure profile. Measurements that make it possible to tailor the cure profile aiming for a low resulting residual stress in a composite material. The accuracy of the measurements of the cue-induced strain is validated through finite element simulations of the deformation of the embedded optical glass fiber containing a Fiber Bragg Grating deformation sensor. The simulations show that a minimum thickness of 2mm and the presence of a minimum of 10 mm embedded optical fibers on both sides of the Fiber Bragg Grating sensor are important for obtaining accurate strain measurements.

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Mikkelsen LP. In-situ measurements of the load transferring shrinkage of thermosets used in composite materials for wind turbine blades. In Vassilopoulos AP, Michaud V, editors, Composites Meet Sustainability – Proceedings of the 20th European Conference on Composite Materials: Materials. Vol. 1. Lausanne, Switzerland: École Polytechnique Fédérale de Lausanne. 2022. p. 218-223 doi: 10.5075/epfl-298799_978-2-9701614-0-0

In-situ measurements of the load transferring shrinkage of thermosets used in composite materials for wind turbine blades

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Conference

Keywords

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Projects

Manufacturing focus group, DTU Wind and Energy Systems

Cite this