Koran, Krystof and Petersen, Enno (2018) An Investigation of a Prediction Method for Failure in the Transition Zones of Locally Reinforced CFRP Materials by Steel Hybridization. DLR-Interner Bericht. DLR-IB-FA-BS-2018-109. Master's. 78 S.
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Abstract
Local metal hybridization is a practice, wherein composite layers are substituted by equally thick metallic foils in a finite region of the laminate. The method can be used to locally increase the bearing strength of the laminate, but also introduces a potential weak-point. The transition zone (TZ) between the fully composite and hybrid laminate must be carefully designed in order to avoid premature failure in this region. In this research, a methodology is designed to predict failure behavior in the TZ under a tensionbending loading case. A tool is designed for a combined loading test, in which a specimen is eccentrically loaded in tension. Specimens with a tailored geometry and various TZ arrangements were designed and manufactured. With the use of digital image correlation and observations by microscopy, the results of the tests are used to validate a finite element model. Interlaminar failure is modeled using cohesive zone interfaces with parameters validated by experimental correlation. The Cuntze criterion is applied with a damage degradation model for characterizing intralaminar failure. Characteristics of a good TZ design are recognized based on knowledge of the sequence of events leading to failure. The principle of a good design is to increase the moment of inertia by placing steel foils at outer positions, to the extent where the increased tendency for delamination does not become critical. A methodology is set up as a tool for future designers to evaluate and (algorithmically) optimize their local hybridization designs.
Item URL in elib: | https://elib.dlr.de/122156/ | |||||||||
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Document Type: | Monograph (DLR-Interner Bericht, Master's) | |||||||||
Title: | An Investigation of a Prediction Method for Failure in the Transition Zones of Locally Reinforced CFRP Materials by Steel Hybridization | |||||||||
Authors: |
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Date: | June 2018 | |||||||||
Refereed publication: | No | |||||||||
Open Access: | Yes | |||||||||
Gold Open Access: | No | |||||||||
In SCOPUS: | No | |||||||||
In ISI Web of Science: | No | |||||||||
Number of Pages: | 78 | |||||||||
Status: | Published | |||||||||
Keywords: | FML, local metal hybridization, combined testing, cohesive zone | |||||||||
HGF - Research field: | Aeronautics, Space and Transport | |||||||||
HGF - Program: | Space | |||||||||
HGF - Program Themes: | Space Transportation | |||||||||
DLR - Research area: | Raumfahrt | |||||||||
DLR - Program: | R RP - Space Transportation | |||||||||
DLR - Research theme (Project): | R - Leitprojekt - Forschungsverbund Oberstufe (old) | |||||||||
Location: | Braunschweig | |||||||||
Institutes and Institutions: | Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures | |||||||||
Deposited By: | Böhringer-Thelen, Isolde | |||||||||
Deposited On: | 13 Dec 2018 06:15 | |||||||||
Last Modified: | 01 Jan 2020 03:00 |
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