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Moderation of thermoplastic composite crystallinity and mechanical properties through in-situ manufacturing and post-manufacturing tempering: Part 2 – Morphological characterisation

Kotzur, Karola and Chadwick, Ashley and Löbbecke, Miriam (2022) Moderation of thermoplastic composite crystallinity and mechanical properties through in-situ manufacturing and post-manufacturing tempering: Part 2 – Morphological characterisation. Composites Part A Applied Science and Manufacturing, 163, e107225. Elsevier. doi: 10.1016/j.compositesa.2022.107225. ISSN 1359-835X.

Full text not available from this repository.

Official URL: https://www.sciencedirect.com/science/article/pii/S1359835X22004067?dgcid=author

Abstract

The piecewise nature of Automated Fibre Placement for thermoplastic composite materials can lead to significant variations in polymer characteristics over the full part volume, in large part owing to differences in cooling rate from melt and the number of high-temperature cycles to which a given point is exposed. In this work, ion etching is used to remove amorphous material from laminate samples and expose the crystalline structure in the matrix. This structure is then assessed using electron microscopy for all material layers, providing insight into the distribution of amorphous and crystalline phases. This investigation assesses laminates produced using unheated as well as heated (145 °C and 220 °C) tooling surfaces to determine the impact on part crystallinity. Samples are also exposed to post-manufacturing tempering to evaluate its ability to alter part morphology without expensive autoclave or thermo-forming operations. The results reveal significant variation in the morphology of a single sample, with an increased tooling temperature acting to promote crystallinity and homogeneity within the part. Furthermore, a significant difference between the morphology of material layers and the boundary zone between adjacent layers is observed, providing insight into previously obtained mechanical properties.

Item URL in elib:https://elib.dlr.de/189301/
Document Type:Article
Title:Moderation of thermoplastic composite crystallinity and mechanical properties through in-situ manufacturing and post-manufacturing tempering: Part 2 – Morphological characterisation
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Kotzur, KarolaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chadwick, AshleyUNSPECIFIEDhttps://orcid.org/0000-0001-7693-5687UNSPECIFIED
Löbbecke, MiriamUNSPECIFIEDhttps://orcid.org/0000-0001-7838-6204UNSPECIFIED
Date:21 October 2022
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:163
DOI:10.1016/j.compositesa.2022.107225
Page Range:e107225
Publisher:Elsevier
ISSN:1359-835X
Status:Published
Keywords:Crystallinity, Thermoplastic composites, Morphology
HGF - Research field:other
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:Digitalisation
DLR - Program:D - no assignment
DLR - Research theme (Project):D - no assignment
Location: Köln-Porz , Stuttgart
Institutes and Institutions:Institute of Materials Research > Metallic Structures and Hybrid Material Systems
Institute of Structures and Design > Design and Manufacture Technologies
Deposited By: Chadwick, Ashley
Deposited On:24 Oct 2022 09:06
Last Modified:24 Oct 2022 09:06

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