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SHAPE ADJUSTMENT PROCESS FOR EPOXY COMPOSITES DURING POST CURE

Schmidt, Jochen (2016) SHAPE ADJUSTMENT PROCESS FOR EPOXY COMPOSITES DURING POST CURE. In: Sampe 2016 Proceedings. Sampe 2016, 23.-26. Mai 2016, Long Beach, USA.

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Abstract

There is an increasing request for high precision composite parts for aeronautic natural laminar flow and low radar cross section applications. The allowed geometrical deviations for such applications are an order of magnitude lower than todays accepted tolerances. The implementation of established measures like tool compensation for spring-in or thermal expansion prior to the manufacturing process significantly reduces the occurring geometrical tolerances. But there are also variations during the manufacturing process that cannot be compensated in advance such as deviations during ply application or varying fiber angles. This publication shows a way how to adapt the manufacturing procedure to achieve high precision composite parts despite of process deviations. The curing characteristics of epoxy resins enable a two-stage curing process. In the initial step the resin is cured to about 65 % chemical interlacing. The viscoelastic properties of partially interlaced epoxides close to their current glass transition temperature allow an adjustment of the components geometry during the following post cure. This can be achieved using a closed loop temperature control combined with a cure monitoring and a geometry measurement system. This means that process induced deviations of composite components made from thermoset matrix systems can be adjusted during the post cure process.

Item URL in elib:https://elib.dlr.de/104677/
Document Type:Conference or Workshop Item (Speech)
Title:SHAPE ADJUSTMENT PROCESS FOR EPOXY COMPOSITES DURING POST CURE
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schmidt, JochenJochen.Schmidt (at) dlr.deUNSPECIFIED
Date:May 2016
Journal or Publication Title:Sampe 2016 Proceedings
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Epoxy, Accuracy, Curing, Degree of Cure, Shape Adjustment, Deviation
Event Title:Sampe 2016
Event Location:Long Beach, USA
Event Type:international Conference
Event Dates:23.-26. Mai 2016
Organizer:Society for the Advancement of Material and Process Engineering
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
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Composite Technology
Deposited By: Schmidt, Jochen
Deposited On:18 Jul 2016 12:01
Last Modified:31 Jul 2019 20:01

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