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Anisogrid stiffened panel under axial compression: Manufacturing, numerical analysis and experimental testing

Niemann, Steffen and Wagner, Ronald and Hühne, Christian (2021) Anisogrid stiffened panel under axial compression: Manufacturing, numerical analysis and experimental testing. Thin-Walled Structures. Elsevier. doi: 10.1016/j.tws.2021.107483. ISSN 0263-8231.

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Within the collaborative FP7 project PoLaRBEAR a high-performance anisogrid prepreg structure concept has been developed considering high quality assurance demands and the need of a state of art manufacturing process (advanced fiber placement). This paper reports on the design, analysis, manufacturing and test of an anisogrid prepreg panel under uniaxial compression. The anisogrid structures consist of intersecting, integral manufactured stiffeners with different directions (helical, circumferential and/or axial) and a load bearing skin. The stiffeners are manufactured from prepreg layers with 60% fiber volume ratio. An alternating pattern of cut and uncut layers is used within the intersection knots to avoid thickening. In addition, there are special interface layers in the stiffener laminate in order to ensure a proper connection between the grid and the load bearing skin even within the postbuckling range. Optical measurements showed that the panel was burdened by manufacturing induced geometric imperfections (process inducted deformations or spring-in) which caused a slight curvature of the anisogrid panel. Geometrically non-linear analyzes were performed using ABAQUS and B2000þþ in order to analyze the pre- and postbuckling response of the panel under axial compression with and without imperfections. Numerical and experimental results are in good agreement if the process induced deformations are considered.

Item URL in elib:https://elib.dlr.de/141062/
Document Type:Article
Title:Anisogrid stiffened panel under axial compression: Manufacturing, numerical analysis and experimental testing
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Niemann, SteffenUNSPECIFIEDhttps://orcid.org/0000-0001-9272-0635UNSPECIFIED
Wagner, RonaldUNSPECIFIEDhttps://orcid.org/0000-0003-2749-1455UNSPECIFIED
Hühne, ChristianUNSPECIFIEDhttps://orcid.org/0000-0002-2218-1223UNSPECIFIED
Date:January 2021
Journal or Publication Title:Thin-Walled Structures
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:Anisogrid Panel Analysis Test Compression Post-buckling Airframe Process-induced distortions Geometric imperfections
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Components and Systems
DLR - Research area:Aeronautics
DLR - Program:L CS - Components and Systems
DLR - Research theme (Project):L - Structural Materials and Design
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Niemann, Herr Steffen
Deposited On:22 Feb 2021 06:52
Last Modified:20 Jun 2021 15:54

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