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Comparison of fibre angles between hand draped carbon fibres and draping simulation

Frommel, Christoph and Körber, Marian (2016) Comparison of fibre angles between hand draped carbon fibres and draping simulation. 8th International Symposium on NDT in Aerospace, 3.-5. November 2016, Bangalore, Indien.

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Abstract

The mechanical properties of carbon fibre reinforced plastics, short CFRP, are highly sensitive to its respective fibre angles. Small deviations result in a high decrease of stiffness in the manufactured parts. In the first steps of industrial engineering for CFRP parts, draping simulations are used to give an approximation of fibre angles that the real draped fabrics adjust to when draped in its three dimensional state. Since the draping simulations are based on mathematical models they do not match the draping results of the manual performed production processes. In order to compensate these manufacture errors, tolerance ranges for fibre angle deviations are set very high. One way to control the fibre angle after draping is to use optical camera systems for quality assurance. The approach at DLR Augsburg to measure fibre angles is realised with a CCD camera, which is mounted on an industrial robot. The measurement system is highly sensitive regarding the reference orientation. Every deviation from the normal axis results in deviation of the measured angle. The setup with the robot guaranties high reproducibility in measurements and a high accuracy to the reference. In this paper a specified cut piece was used to perform draping simulations with different mathematical models. The cut piece was manually draped onto a tooling. The resulting fibre angles were measured with the robot controlled measurement system. In the end a comparison between the simulated and draped fibre angles was done. The result provides hints which solver delivers the lowest errors for the draped cut piece. With this information the tolerance ranges could be reduced which lead to fewer plies of carbon fibres. Less carbon fibres lead to less material cost, weight and manufacturing time.

Item URL in elib:https://elib.dlr.de/109594/
Document Type:Conference or Workshop Item (Other)
Additional Information:Paper für den Konferenzband
Title:Comparison of fibre angles between hand draped carbon fibres and draping simulation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Frommel, Christophchristoph.frommel (at) dlr.deUNSPECIFIED
Körber, Marianmarian.koerber (at) dlr.deUNSPECIFIED
Date:2016
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Draping simulation, fibre angle measurement, robotic controlled measurement
Event Title:8th International Symposium on NDT in Aerospace
Event Location:Bangalore, Indien
Event Type:international Conference
Event Dates:3.-5. November 2016
Organizer:Indian Institute of Science
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: Augsburg
Institutes and Institutions:Institute of Structures and Design > Automation and Quality Assurance in Production
Deposited By: Frommel, Christoph
Deposited On:19 Dec 2016 11:31
Last Modified:19 Dec 2016 11:31

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