Effects of defects on laminate quality and mechanical performance in thermoplastic Automated Fiber Placement-based process chains

Automated Fiber Placement of thermoplastic unidirectional tape materials offers several advantages over conventional organosheets, such as enhanced part performance through tailored fiber architecture, and economic and ecological benefits due to scrap reduction. Because material is cut perpendicular...

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Autores principales:	Thomas Zenker, Fabian Bruckner, Klaus Drechsler
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2019
Materias:	automated fiber placement thermoplastic defects consolidation mechanical testing stamp forming undulations digital image correlation Polymers and polymer manufacture TP1080-1185 Automation T59.5
Acceso en línea:	https://doaj.org/article/3d2ae1f117174cd289302589c6ec98ef
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spelling	oai:doaj.org-article:3d2ae1f117174cd289302589c6ec98ef2021-12-02T09:03:00ZEffects of defects on laminate quality and mechanical performance in thermoplastic Automated Fiber Placement-based process chains2055-035910.1080/20550340.2019.1703334https://doaj.org/article/3d2ae1f117174cd289302589c6ec98ef2019-10-01T00:00:00Zhttp://dx.doi.org/10.1080/20550340.2019.1703334https://doaj.org/toc/2055-0359Automated Fiber Placement of thermoplastic unidirectional tape materials offers several advantages over conventional organosheets, such as enhanced part performance through tailored fiber architecture, and economic and ecological benefits due to scrap reduction. Because material is cut perpendicular to the feeding direction in state-of-the-art machine technology, triangular gaps and overlaps occur when geometrically complex layups are fabricated. Their effect on part properties is unknown for thermoplastic materials. This study investigates the influence of various defect configurations on laminate quality and mechanical performance for different consolidation processes. Analysis of microsections prepared from post-consolidation specimens shows out-of-plane undulations in defect areas. The undulation extent is quantified by angle and deflection. Tensile and compressive testing is performed. Gaps reduce ultimate tensile and compressive strength significantly for variothermal press and autoclave consolidation. Digital-image-correlation-based strain measurement during tensile testing shows strain concentration in the defect area for these specimens. Specimens consolidated in an isothermal stamp forming process show no comparable stress concentration, as well as no reduced ultimate strength. Specimens containing overlaps generally show a better performance in terms of ultimate strength compared to those containing gaps. Even though no full factorial design of experiments was used, the results obtained from this study can be used as a baseline for sector-boundary design strategies. The definition of defect-specific knock-down factors would be a next step towards the solid engineering of thermoplastic Automated Fiber Placement parts.Thomas ZenkerFabian BrucknerKlaus DrechslerTaylor & Francis Grouparticleautomated fiber placementthermoplasticdefectsconsolidationmechanical testingstamp formingundulationsdigital image correlationPolymers and polymer manufactureTP1080-1185AutomationT59.5ENAdvanced Manufacturing: Polymer & Composites Science, Vol 5, Iss 4, Pp 184-205 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	automated fiber placement thermoplastic defects consolidation mechanical testing stamp forming undulations digital image correlation Polymers and polymer manufacture TP1080-1185 Automation T59.5
spellingShingle	automated fiber placement thermoplastic defects consolidation mechanical testing stamp forming undulations digital image correlation Polymers and polymer manufacture TP1080-1185 Automation T59.5 Thomas Zenker Fabian Bruckner Klaus Drechsler Effects of defects on laminate quality and mechanical performance in thermoplastic Automated Fiber Placement-based process chains
description	Automated Fiber Placement of thermoplastic unidirectional tape materials offers several advantages over conventional organosheets, such as enhanced part performance through tailored fiber architecture, and economic and ecological benefits due to scrap reduction. Because material is cut perpendicular to the feeding direction in state-of-the-art machine technology, triangular gaps and overlaps occur when geometrically complex layups are fabricated. Their effect on part properties is unknown for thermoplastic materials. This study investigates the influence of various defect configurations on laminate quality and mechanical performance for different consolidation processes. Analysis of microsections prepared from post-consolidation specimens shows out-of-plane undulations in defect areas. The undulation extent is quantified by angle and deflection. Tensile and compressive testing is performed. Gaps reduce ultimate tensile and compressive strength significantly for variothermal press and autoclave consolidation. Digital-image-correlation-based strain measurement during tensile testing shows strain concentration in the defect area for these specimens. Specimens consolidated in an isothermal stamp forming process show no comparable stress concentration, as well as no reduced ultimate strength. Specimens containing overlaps generally show a better performance in terms of ultimate strength compared to those containing gaps. Even though no full factorial design of experiments was used, the results obtained from this study can be used as a baseline for sector-boundary design strategies. The definition of defect-specific knock-down factors would be a next step towards the solid engineering of thermoplastic Automated Fiber Placement parts.
format	article
author	Thomas Zenker Fabian Bruckner Klaus Drechsler
author_facet	Thomas Zenker Fabian Bruckner Klaus Drechsler
author_sort	Thomas Zenker
title	Effects of defects on laminate quality and mechanical performance in thermoplastic Automated Fiber Placement-based process chains
title_short	Effects of defects on laminate quality and mechanical performance in thermoplastic Automated Fiber Placement-based process chains
title_full	Effects of defects on laminate quality and mechanical performance in thermoplastic Automated Fiber Placement-based process chains
title_fullStr	Effects of defects on laminate quality and mechanical performance in thermoplastic Automated Fiber Placement-based process chains
title_full_unstemmed	Effects of defects on laminate quality and mechanical performance in thermoplastic Automated Fiber Placement-based process chains
title_sort	effects of defects on laminate quality and mechanical performance in thermoplastic automated fiber placement-based process chains
publisher	Taylor & Francis Group
publishDate	2019
url	https://doaj.org/article/3d2ae1f117174cd289302589c6ec98ef
work_keys_str_mv	AT thomaszenker effectsofdefectsonlaminatequalityandmechanicalperformanceinthermoplasticautomatedfiberplacementbasedprocesschains AT fabianbruckner effectsofdefectsonlaminatequalityandmechanicalperformanceinthermoplasticautomatedfiberplacementbasedprocesschains AT klausdrechsler effectsofdefectsonlaminatequalityandmechanicalperformanceinthermoplasticautomatedfiberplacementbasedprocesschains
_version_	1718398238272258048

Effects of defects on laminate quality and mechanical performance in thermoplastic Automated Fiber Placement-based process chains

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