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Effect of low temperature on mode I and mode II interlaminar fracture toughness of CFRP-steel hybrid laminates

Koord, Josef and Völkerink, Oliver and Petersen, Enno and Hühne, Christian (2023) Effect of low temperature on mode I and mode II interlaminar fracture toughness of CFRP-steel hybrid laminates. Composites Part B Engineering. Elsevier. doi: 10.1016/j.compositesb.2023.110773. ISSN 1359-8368.

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Official URL: https://doi.org/10.1016/j.compositesb.2023.110773


Delamination is the dominant failure type in fiber metal laminates (FML), particularly when combining carbon fiber reinforced plastics (CFRP) with steel. Their interface behavior is frequently studied using the double cantilever beam (DCB) and end-notched flexure (ENF) setup for mode I and mode II delamination, respectively. By nature, analysis of hybrid interfaces requires asymmetric laminate layups. Thus, thermal residual stresses (TRS) are acting on the interfaces. A framework for the correction of the apparent fracture toughness from experimental testing and for accurate numerical modeling is provided. The approach is validated using DCB and ENF test results at -55 °C and 23 °C. The results demonstrate the necessity of incorporating TRS in the analysis of asymmetric CFRP-steel FMLs, i.e. including a temperature step and using the true fracture toughness value as simulation input. Otherwise, delamination onset is mispredicted by up to 29 %.

Item URL in elib:https://elib.dlr.de/195181/
Document Type:Article
Title:Effect of low temperature on mode I and mode II interlaminar fracture toughness of CFRP-steel hybrid laminates
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Koord, JosefUNSPECIFIEDhttps://orcid.org/0000-0002-2749-1546UNSPECIFIED
Völkerink, OliverUNSPECIFIEDhttps://orcid.org/0000-0002-9589-1963UNSPECIFIED
Petersen, EnnoFraunhofer IWEShttps://orcid.org/0000-0002-1488-5618UNSPECIFIED
Hühne, ChristianUNSPECIFIEDhttps://orcid.org/0000-0002-2218-1223135953371
Date:16 May 2023
Journal or Publication Title:Composites Part B Engineering
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:Hybrid, Fracture toughness, Residual/internal stress, Finite element analysis (FEA)
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Photovoltaics and Wind Energy
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Wind Energy
Location: Stade
Institutes and Institutions:Institut für Systemleichtbau > Composite Design
Deposited By: Koord, Josef
Deposited On:30 May 2023 10:45
Last Modified:30 May 2023 13:46

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