Wrinkle Formation and Initial Defect Sensitivity of Steered Tow in Automated Fiber Placement

This paper aims to study the wrinkle formation of a prepreg with initial defect during steering in automated fiber placement (AFP). Wrinkle formation has a detrimental effect on the mechanical properties of the final product, limiting the AFP applications. A theoretical model for wrinkle formation h...

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Autores principales:	Meisam Kheradpisheh, Mehdi Hojjati
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	wrinkle formation prepreg automated fiber placement initial defect Technology T Science Q
Acceso en línea:	https://doaj.org/article/9a1501e1525a4938885f3f2acec8d702
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spelling	oai:doaj.org-article:9a1501e1525a4938885f3f2acec8d7022021-11-25T18:03:14ZWrinkle Formation and Initial Defect Sensitivity of Steered Tow in Automated Fiber Placement10.3390/jcs51102952504-477Xhttps://doaj.org/article/9a1501e1525a4938885f3f2acec8d7022021-11-01T00:00:00Zhttps://www.mdpi.com/2504-477X/5/11/295https://doaj.org/toc/2504-477XThis paper aims to study the wrinkle formation of a prepreg with initial defect during steering in automated fiber placement (AFP). Wrinkle formation has a detrimental effect on the mechanical properties of the final product, limiting the AFP applications. A theoretical model for wrinkle formation has been developed in which a Pasternak foundation and a Koiter imperfection model are adapted to model viscoelastic characteristics of the prepreg tack and initial defect of the prepreg, respectively. The initial defect is defined as a slight deviation of the tow’s mid-plane from a horizontal shape. The initial defect is generated in the tow by moving the tow through the guidance system, pressure of the roller, and resin tackiness. Galerkin method, along with the finite difference method (FDM), are employed to solve the wrinkle problem equation. The proposed method is able to satisfy the different boundary conditions for the wrinkle problem completely. The numerical results show that increasing the initial defect leads to a decrease in critical load and an increase in critical steering radius. To validate the theoretical model, experimental results are presented and compared with model-predicted results. It is shown that the model is well able to capture the trends and values of wrinkle formation wavelengths obtained from the experiment.Meisam KheradpishehMehdi HojjatiMDPI AGarticlewrinkle formationprepregautomated fiber placementinitial defectTechnologyTScienceQENJournal of Composites Science, Vol 5, Iss 295, p 295 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	wrinkle formation prepreg automated fiber placement initial defect Technology T Science Q
spellingShingle	wrinkle formation prepreg automated fiber placement initial defect Technology T Science Q Meisam Kheradpisheh Mehdi Hojjati Wrinkle Formation and Initial Defect Sensitivity of Steered Tow in Automated Fiber Placement
description	This paper aims to study the wrinkle formation of a prepreg with initial defect during steering in automated fiber placement (AFP). Wrinkle formation has a detrimental effect on the mechanical properties of the final product, limiting the AFP applications. A theoretical model for wrinkle formation has been developed in which a Pasternak foundation and a Koiter imperfection model are adapted to model viscoelastic characteristics of the prepreg tack and initial defect of the prepreg, respectively. The initial defect is defined as a slight deviation of the tow’s mid-plane from a horizontal shape. The initial defect is generated in the tow by moving the tow through the guidance system, pressure of the roller, and resin tackiness. Galerkin method, along with the finite difference method (FDM), are employed to solve the wrinkle problem equation. The proposed method is able to satisfy the different boundary conditions for the wrinkle problem completely. The numerical results show that increasing the initial defect leads to a decrease in critical load and an increase in critical steering radius. To validate the theoretical model, experimental results are presented and compared with model-predicted results. It is shown that the model is well able to capture the trends and values of wrinkle formation wavelengths obtained from the experiment.
format	article
author	Meisam Kheradpisheh Mehdi Hojjati
author_facet	Meisam Kheradpisheh Mehdi Hojjati
author_sort	Meisam Kheradpisheh
title	Wrinkle Formation and Initial Defect Sensitivity of Steered Tow in Automated Fiber Placement
title_short	Wrinkle Formation and Initial Defect Sensitivity of Steered Tow in Automated Fiber Placement
title_full	Wrinkle Formation and Initial Defect Sensitivity of Steered Tow in Automated Fiber Placement
title_fullStr	Wrinkle Formation and Initial Defect Sensitivity of Steered Tow in Automated Fiber Placement
title_full_unstemmed	Wrinkle Formation and Initial Defect Sensitivity of Steered Tow in Automated Fiber Placement
title_sort	wrinkle formation and initial defect sensitivity of steered tow in automated fiber placement
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/9a1501e1525a4938885f3f2acec8d702
work_keys_str_mv	AT meisamkheradpisheh wrinkleformationandinitialdefectsensitivityofsteeredtowinautomatedfiberplacement AT mehdihojjati wrinkleformationandinitialdefectsensitivityofsteeredtowinautomatedfiberplacement
_version_	1718411696579543040

Wrinkle Formation and Initial Defect Sensitivity of Steered Tow in Automated Fiber Placement

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