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Investigations related to most critical imperfections of composite structures

Arbelo, Mariano and Degenhardt, Richard and Castro, Saullo and Zimmermann, Rolf (2012) Investigations related to most critical imperfections of composite structures. 7th Int. Conf. Supply on the Wings, 6.-8.-Nov. 2012, Frankfurt, Germany.

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Abstract

This work presents a numerical investigation about the different methodologies to characterize the behavior of imperfection sensitive structures subjected to compressive loads up to the post-buckling regime. The aim is propose a reliable numerical methodology to use as a design tool, for unstiffened composite cylinders, to calculate less conservative knock-down factors than the obtained with the classical approaches, like the NASA SP 8007 guideline. Two new approaches to take into account geometrical imperfection effects in finite element models are presented and discussed. The first methodology called “Single Perturbation Load Approach” (SPLA) was proposed by Hühne (2008) as a simple way to calculate less conservative knock-down factors than the NASA SP 8007 guideline. The second methodology, called “Multiple Perturbation Load Approach” has been developed in order to compare the reliability of the SPLA and verify the range of applicability of these methodologies among other most conventional approaches, such as geometric imperfections from the linear combination of buckling modes calculated in linear buckling analysis.

Item URL in elib:https://elib.dlr.de/83842/
Document Type:Conference or Workshop Item (Speech)
Title:Investigations related to most critical imperfections of composite structures
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Arbelo, MarianoPFH GöttingenUNSPECIFIED
Degenhardt, RichardUNSPECIFIEDUNSPECIFIED
Castro, SaulloPFH GöttingenUNSPECIFIED
Zimmermann, RolfUNSPECIFIEDUNSPECIFIED
Date:2012
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Composite materials, buckling, knock-down factor
Event Title:7th Int. Conf. Supply on the Wings
Event Location:Frankfurt, Germany
Event Type:international Conference
Event Dates:6.-8.-Nov. 2012
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Raumfahrzeugsysteme - Numerische Verfahren und Simulation
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Structural Mechanics
Deposited By: Degenhardt, Richard
Deposited On:11 Nov 2013 20:20
Last Modified:11 Nov 2013 20:20

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