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Adhesive Joints in Composite Laminates - A Combined Numerical/Experimental Estimate of Critical Energy Release Rates

Balzani, Claudio and Wagner, Werner and Wilckens, Dirk and Degenhardt, Richard and Büring, Sebastian and Reimerdes, H.-G. (2012) Adhesive Joints in Composite Laminates - A Combined Numerical/Experimental Estimate of Critical Energy Release Rates. International Journal of Adhesion and Adhesives (32), pp. 23-38. Elsevier. DOI: 10.1016/j.ijadhadh.2011.09.002 ISSN 0143-7496

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Official URL: http://www.sciencedirect.com/science/article/pii/S014374961100128X

Abstract

The characterization of critical energy release rates of adhesive joints in laminated composite structures is a key issue when failure analyses have to be performed. Critical energy release rates, or fracture toughnesses, are known to be dependent on the mode mixing ratio, i.e. the portion of shear loading. It is thus useful to determine a criterion which gives the critical energy release rate as a function of the mode mixing ratio, which is the overall goal of this paper. For this purpose several experiments have been performed, for single mode I, single mode II, and mixed mode I/II loading conditions with pre-defined mode mixing ratios. Unfortunately, most of the experimental outcome cannot be used directly for least squares fitting of suitable fracture toughness criteria due to a couple of reasons, which will be discussed in detail. Hence, a numerical approach based on cohesive interface elements is employed to determine some of the critical energy release rates by fitting against experimental load–deformation curves. This combined numerical/experimental approach yields a useful database of discrete critical energy release rate values. These are utilized to fit suitable criteria which then allow the calculation of critical energy release rates for any given mode mixing ratio. The results are discussed in terms of convergence to the discrete values and physical plausibility, and a simple possibility to include mode III behavior is presented.

Item URL in elib:https://elib.dlr.de/83803/
Document Type:Article
Title:Adhesive Joints in Composite Laminates - A Combined Numerical/Experimental Estimate of Critical Energy Release Rates
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Balzani, ClaudioUniversität KarlsruheUNSPECIFIED
Wagner, WernerUniversität KarlsruheUNSPECIFIED
Wilckens, DirkUNSPECIFIEDUNSPECIFIED
Degenhardt, RichardUNSPECIFIEDUNSPECIFIED
Büring, SebastianRWTH AachenUNSPECIFIED
Reimerdes, H.-G.RWTH AachenUNSPECIFIED
Date:2012
Journal or Publication Title:International Journal of Adhesion and Adhesives
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.ijadhadh.2011.09.002
Page Range:pp. 23-38
Publisher:Elsevier
ISSN:0143-7496
Status:Published
Keywords:Adhesive joint, Cohesive interface element, Composite laminate, Material characterization, Critical energy release rate, Fracture toughness
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation (old), L - Structures & Materials (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Structural Mechanics
Deposited By: Degenhardt, Richard
Deposited On:18 Sep 2013 14:25
Last Modified:31 Jul 2019 19:41

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