elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

An Investigation of a Prediction Method for Failure in the Transition Zones of Locally Reinforced CFRP Materials by Steel Hybridization

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. Master's. DLR-Interner Bericht. DLR-IB-FA-BS-2018-109, 78 S.

[img] PDF
12MB

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/
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:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Koran, KrystofTU DelftUNSPECIFIED
Petersen, EnnoEnno.Petersen (at) dlr.dehttps://orcid.org/0000-0002-1488-5618
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 Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Leitprojekt - Forschungsverbund Oberstufe
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

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.