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A controlled recipient evacuation process to form composite profiles from flat multi-angle prepreg stacks – infrastructure and C-profile verification

Kappel, Erik and Albrecht, Michael (2019) A controlled recipient evacuation process to form composite profiles from flat multi-angle prepreg stacks – infrastructure and C-profile verification. Advanced Manufacturing: Polymer and Composites Science, pp. 1-15. Taylor & Francis. doi: 10.1080/20550340.2019.1660455. ISSN 2055-0340.

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Official URL: https://u9648322.ct.sendgrid.net/wf/click?upn=u-2BGpmJjK6GMwjtTW1XoK4vgZn1TWMFEC9c1PSLVT5mdgsK-2F88oE2nd0tctqKk8JYh4fpFrPAxQMViFMIUSQvfWZS-2FEXmb0ynbfI6hJLIGYE-3D_TxnkXXMgGe4qwkdzPtuL3kB-2B-2BA7FKDRTR-2FS1odHmw9e3QXBhuaIl9sVxlRBghdsdTjghPJoz8iqbdZbXe7uTtN

Abstract

Single-diaphragm forming is a cost saving alternative to labor-intensive ply-by-ply layup. This paper reports on forming of flat uncured multi-angle prepreg stacks into C shape. The main focus is on the forming-process profile precipient ¼ fðt, TÞ, which has attracted little attention in previous studies on the topic. Hexcel’s M21E/IMA prepreg is examined within the study to analyze the particular effect of the prepreg’s interleaf layers on the forming process and vice versa. Specimens with different multi-angle stackings were formed at 40, 60 and 80 C, on male tools with 4, 6 and 8 mm radii. It is shown that the composed infrastructure setup allows for a precise control of the recipient pressure profile. The forming status is monitored based on a resistance-measurement-based approach, whose application suggests a two-phase forming process characteristic. Recipient pressure levels of 60 and 510 mbar below ambient pressure were identified as practical for gentle forming. It could be shown that interleaf layers of M21E/IMA specimens are not harmed considerably by the forming procedure. Overall, the proposed forming process led to prepreg preforms of adequate quality, suitable for series production.

Item URL in elib:https://elib.dlr.de/129064/
Document Type:Article
Title:A controlled recipient evacuation process to form composite profiles from flat multi-angle prepreg stacks – infrastructure and C-profile verification
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kappel, ErikErik.Kappel (at) dlr.dehttps://orcid.org/0000-0002-8760-8451
Albrecht, MichaelMichael.Albrecht (at) dlr.deUNSPECIFIED
Date:6 September 2019
Journal or Publication Title:Advanced Manufacturing: Polymer and Composites Science
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1080/20550340.2019.1660455
Page Range:pp. 1-15
Publisher:Taylor & Francis
ISSN:2055-0340
Status:Published
Keywords:Layered structures; prepreg; preforming; process automation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Kappel, Dr.-Ing. Erik
Deposited On:23 Sep 2019 04:39
Last Modified:14 Dec 2019 04:24

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