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Moderation of thermoplastic composite crystallinity and mechanical properties through in situ manufacturing and post-manufacturing tempering: Part 1 - Mechanical characterisation

Chadwick, Ashley and Kotzur, Karola and Nowotny, Sebastian (2021) Moderation of thermoplastic composite crystallinity and mechanical properties through in situ manufacturing and post-manufacturing tempering: Part 1 - Mechanical characterisation. Composites Part A: Applied Science and Manufacturing, 143. Elsevier. doi: 10.1016/j.compositesa.2021.106286. ISSN 1359-835X.

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Abstract

This study presents an investigation into the sensitivity of CF-PPS thermoplastic composite material to automated fibre placement process parameters: specifically the surface temperature of the layup tool and the addition of simple tempering post-manufacturing. The impact of both are investigated using DSC and mechanical tests, with a thermal analysis of the as-delivered material acting as a reference. Reference material measurements show that secondary crystallinity can be produced by exposing the material to temperatures above the cold (heating) crystallisation temperature. This secondary crystallinity begins to dominate the polymer-inherent crystallinity as the tempering conditions begin to approach the material melting temperature. At the maximum temperature tested (260° C), secondary crystallinity accounts for over 70% of the total. Laminates produced using heated tools show a significant increase in both inter-laminar shear and perpendicular tensile properties with increasing temperature. Additionally, tempering samples is able to increase the polymer tensile strength by up to 32%.

Item URL in elib:https://elib.dlr.de/144924/
Document Type:Article
Title:Moderation of thermoplastic composite crystallinity and mechanical properties through in situ manufacturing and post-manufacturing tempering: Part 1 - Mechanical characterisation
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Chadwick, AshleyAshley.Chadwick (at) dlr.dehttps://orcid.org/0000-0001-7693-5687
Kotzur, Karolakarola.kotzur (at) dlr.deUNSPECIFIED
Nowotny, SebastianSebastian.Nowotny (at) dlr.dehttps://orcid.org/0000-0002-5333-953X
Date:April 2021
Journal or Publication Title:Composites Part A: Applied Science and Manufacturing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:143
DOI :10.1016/j.compositesa.2021.106286
Publisher:Elsevier
ISSN:1359-835X
Status:Published
Keywords:AFP, Thermoplastics, Crystallinity, Automated manufacturing
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Components and Systems
DLR - Research area:Aeronautics
DLR - Program:L CS - Components and Systems
DLR - Research theme (Project):L - Structural Materials and Design
Location: Köln-Porz , Stuttgart
Institutes and Institutions:Institute of Structures and Design > Design and Manufacture Technologies
Institute of Materials Research > Metallic Structures and Hybrid Material Systems
Deposited By: Nowotny, Sebastian
Deposited On:27 Oct 2021 12:27
Last Modified:27 Oct 2021 12:27

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