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Resistance seam welding of carbon fiber semi-finished products

Zacharias, Fabian and Schmidt, Hauke and Torstrick, Sven and Stüve, Jan (2017) Resistance seam welding of carbon fiber semi-finished products. 3rd International Symposium on Automated Composites Manufacturing (3rd ACM), 20.-21.04.2017, Montreal, Kanada.

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The DLR preforming process for non-crimped-fabrics (ncf) as part of the RTM-Process chain consists of automated draping, a new binder activation process through electrical resistance heating, consolidation inside a membrane press and trimming of the preform to net shape. On the ncf a powder binder is applied. During the process of binder activation the binder powder is heated under pressure until it melts and then cooled down. As a result plies can be fixed to each other respectivly consolidated. Consolidation with the help of a membrane press is energy inefficient and time consuming, since membrane and tool are heated as well. In this paper it is investigated whether a roll electrode has the ability to replace a conventional consolidation press. Since a roll electrode applies heat and pressure at the same time a consolidation is possible. In this process the carbon fibers are heated by an electric current. In contrast to state of the art electrical resistance heating, the voltage is applied in through-thickness direction. In order to have a homogeneous temperature distribution the parameters pressure, roll width, number of fiber layers and activation speed was varied in a full-factorial experimental plan. Ultrasonic fine-trimming of roll-electrode consolidated preforms was investigated. Also the fiber volume content of the preform was measured with the help of a laser light sheet sensor and compared to specimen of a consolidation press.

Item URL in elib:https://elib.dlr.de/112268/
Document Type:Conference or Workshop Item (Speech)
Title:Resistance seam welding of carbon fiber semi-finished products
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Zacharias, FabianFabian.Zacharias (at) dlr.dehttps://orcid.org/0000-0002-4545-4079
Schmidt, HaukeHauke.Schmidt (at) dlr.deUNSPECIFIED
Torstrick, Svensven.torstrick (at) dlr.deUNSPECIFIED
Stüve, Janjan.stueve (at) dlr.deUNSPECIFIED
Date:21 April 2017
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:carbon fiber, binder activation, compaction, roller electrode, CFRP, ncf, preform, preforming
Event Title:3rd International Symposium on Automated Composites Manufacturing (3rd ACM)
Event Location:Montreal, Kanada
Event Type:international Conference
Event Dates:20.-21.04.2017
Organizer:Concordia University
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: Stade
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Composite Process Technology
Deposited By: Zacharias, Fabian
Deposited On:27 Sep 2017 22:50
Last Modified:31 Jul 2019 20:09

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