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TESTING AND ANALYIS OF ANISOGRID PREPREG ELEMENT SPECIMEN UNDER UNIAXIAL TENSION AND COMPRESSION

Niemann, Steffen and Beerhorst, Matthias and Wagner, Ronald and Hühne, Christian (2015) TESTING AND ANALYIS OF ANISOGRID PREPREG ELEMENT SPECIMEN UNDER UNIAXIAL TENSION AND COMPRESSION. 20th International Conference on Composite Materials, 19.-24. Jul. 2015, Kopenhagen, Dänemark.

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Abstract

This paper reports on test results and analysis of Anisogrid Prepreg knot and rib specimen under uniaxial tension and compression. Due to the special knot design of the Anisogrid Prepreg structure concept, this investigation aims to characterize stiffness and strength properties for these two kinds of specimen. Integral Anisogrid structures contain intersecting, integral manufactured ribs with different directions (circumferential, axial, and/or helical) and optionally a load bearing skin. The classical manufacturing method for aerospace grid structures is wet-filament winding. For airframes, an Anisogrid Prepreg structure concept has been developed considering high quality assurance demands and the need of a State of Art manufacturing process (Advanced Fibre Placement). In this investigation, element-sized specimens of this Anisogrid Prepreg structure concept has been analysed and tested. This design concept consists of undisturbed and disturbed Prepreg layers with 60% fibre volume ratio, which are placed in an alternating pattern in the structure. Disturbed layers are cut in the point of intersecting rib directions. Due to the special stacking of the ribs with rectangular cross-section and very narrow ply widths, a wide reference testing program is used additionally. This means that in the testing program laminate specimens with typical stacking, rib test specimens cut out of a thick plate and manually laid rib and knot specimens have been produced, tested and compared to analytical strength calculations. As result, an answer is given which stiffness and strength properties in tension and compression can be expected for this Anisogrid Prepreg structure concept.

Item URL in elib:https://elib.dlr.de/97861/
Document Type:Conference or Workshop Item (Speech)
Title:TESTING AND ANALYIS OF ANISOGRID PREPREG ELEMENT SPECIMEN UNDER UNIAXIAL TENSION AND COMPRESSION
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Niemann, Steffensteffen.niemann (at) dlr.deUNSPECIFIED
Beerhorst, Matthiasmatthias.beerhorst (at) dlr.deUNSPECIFIED
Wagner, Ronaldronald.wagner (at) dlr.deUNSPECIFIED
Hühne, Christianchristian.huehne (at) dlr.deUNSPECIFIED
Date:July 2015
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Anisogrid, Analysis, Test, Properties, Tension, Compression, Airframe
Event Title:20th International Conference on Composite Materials
Event Location:Kopenhagen, Dänemark
Event Type:international Conference
Event Dates:19.-24. Jul. 2015
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:air traffic management and operations
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Air Transport Concepts and Operation (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Niemann, Herr Steffen
Deposited On:27 Sep 2015 17:51
Last Modified:27 Sep 2015 17:51

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