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Determination of stresses, strains and failure types in multidirectional laminates under pure bending

Petersen, Enno and Kappel, Erik and Koord, Josef and Völkerink, Oliver and Hühne, Christian (2020) Determination of stresses, strains and failure types in multidirectional laminates under pure bending. Journal of Composite Materials, 002199832093230. Sage Publications. doi: 10.1177/0021998320932301. ISSN 0021-9983.

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Official URL: http://dx.doi.org/10.1177/0021998320932301


Curved structures made of fibre-reinforced plastics tend to show an out-of-plane failure type, when loaded under bending. One method to determine the related tensile strength in thickness direction, is the standardised unfolding test related to ASTM D6415 with L-profile specimens. However, the standard shall be used for unidirectional materials only, which is not the case for multidirectional laminates. Therefore, this publication presents methods to determine the layer-wise stress and strain state as well as occurring failure types of multidirectional laminates. An extension of the Lekhnitski formulae is presented and its results are validated by comparison with high resolution strain measurements by Digital Image Correlation. Based on the analytical solution, a failure analysis using Cuntze’s Failure Mode Concept is conducted. It was revealed, that the failure load and position can be predicted accurately, if a failure type related strength –in-plane or out-of-plane failure– is used. In the presence of 45°-layers higher deviations occur between test and prediction and therefore limits the validity of the presented analytical failure analysis.

Item URL in elib:https://elib.dlr.de/135353/
Document Type:Article
Title:Determination of stresses, strains and failure types in multidirectional laminates under pure bending
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Petersen, EnnoEnno.Petersen (at) dlr.dehttps://orcid.org/0000-0002-1488-5618
Kappel, ErikErik.Kappel (at) dlr.dehttps://orcid.org/0000-0002-8760-8451
Koord, JosefJosef.Koord (at) dlr.dehttps://orcid.org/0000-0002-2749-1546
Völkerink, Oliveroliver.voelkerink (at) dlr.dehttps://orcid.org/0000-0002-9589-1963
Hühne, ChristianChristian.Huehne (at) dlr.dehttps://orcid.org/0000-0002-2218-1223
Date:June 2020
Journal or Publication Title:Journal of Composite Materials
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1177/0021998320932301
Page Range:002199832093230
Publisher:Sage Publications
Keywords:Out-of-plane strength, delamination, mechanical testing, non-destructive testing, layered structures
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), L - Simulation and Validation (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Völkerink, Oliver
Deposited On:22 Jun 2020 10:45
Last Modified:22 Jun 2020 10:45

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