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Inter-laminar shear stress in hybrid CFRP/Austenitic Steel

Lopes, Joao and Freitas, Manuel and Stefaniak, Daniel and Camanho, Pedro (2015) Inter-laminar shear stress in hybrid CFRP/Austenitic Steel. Frattura ed Integrità Strutturale/Fracture and Structural Integrity, 31, pp. 67-79. Gruppo Italiano Frattura. doi: 10.3221/IGF-ESIS.31.06. ISSN 1971-8993.

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Official URL: http://www.fracturae.com/index.php/fis/article/view/IGF-ESIS.31.06


Bolted joints are the most common solution for joining composite components in aerospace structures. Critical structures such as wing to fuselage joints, or flight control surface fittings use bolted joining techniques. Recent research concluded that higher bearing strengths in composite bolted joints can be achieved by a CFRP/ Titanium hybrid lay-up in the vicinity of the bolted joint. The high costs of titanium motivate a similar research with the more cost competitive austenitic steel. An experimental program was performed in order to compare the apparent inter-laminar shear stress (ILSS) of a CFRP reference beam with the ILSS of hybrid CFRP/Steel beams utilizing different surface treatments in the metallic ply. The apparent ILSS was determined by short beam test, a three-point bending test. Finite element models using cohesive elements in the CFRP/Steel interface were built to simulate the short beam test in the reference beam and in the highest interlaminar shear stress hybrid beam. The main parameters for a FEM simulation of inter laminar shear are the cohesive elements damage model and appropriate value for the critical energy release rate. The results show that hybrid CFRP/Steel have a maximum ILSS very similar to the ILSS of the reference beam. Hybrid CFRP/Steel is a competitive solution when compared with the reference beam ILSS. FEM models were able to predict the maximum ILSS in each type of beam.

Item URL in elib:https://elib.dlr.de/97512/
Document Type:Article
Title:Inter-laminar shear stress in hybrid CFRP/Austenitic Steel
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lopes, JoaoICEMS and Departamento de Engenharia Mecânica. Instituto Superior Técnico. Universidade de Lisboa.UNSPECIFIED
Freitas, ManuelICEMS and Departamento de Engenharia Mecânica. Instituto Superior Técnico. Universidade de Lisboa.UNSPECIFIED
Stefaniak, Danieldaniel.stefaniak (at) dlr.deUNSPECIFIED
Camanho, PedroIDMEC. Pólo FEUP. Rua Dr. Roberto Frias. 4200-465 Porto. PortugalUNSPECIFIED
Journal or Publication Title:Frattura ed Integrità Strutturale/Fracture and Structural Integrity
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.3221/IGF-ESIS.31.06
Page Range:pp. 67-79
EditorsEmailEditor's ORCID iD
Iacoviello, FrancescoUniversità di Cassino e del Lazio Meridionale, ItalyUNSPECIFIED
Publisher:Gruppo Italiano Frattura
Keywords:Fracture; Fatigue; Durability; Case studies; Experimental techniques; Numerical techniques
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: Stefaniak, Dr. Daniel
Deposited On:27 Jul 2015 18:07
Last Modified:14 Dec 2019 04:23

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