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Effects of adhesive thickness on the mode I cohesive zone model parameters of a high toughness structural adhesive
Technical Paper
2018-36-0071
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The automotive industry is currently increasing its use of structural adhesives to reduce vehicle weight and improve crash resistance. The development
of design criteria for structural adhesives are essential to increase designers’ confidence and consequently its utilization. A recent approach
consists in the use of Cohesive Zone Model (CZM) through Finite Element Method (FEM) programs. A CZM requires a traction-separation (σ-δ) law to
represent the adhesive being modeled between two surfaces. To define a σ-δ law essentially three parameters are necessary: the adhesive’s stiffness,
K, the cohesive traction, ,
and the critical fracture toughness, ,
in the respective mode of loading i. This paper deals with an experimental/numerical approach to investigate the bond thickness effect into the σ-δ
law parameters in mode I. The adhesive tested, Betamate 1496s, is a one component, heat curing, high toughness structural epoxy adhesive, commonly
employed on the bonding of vehicles body structure. Double Cantilever Beam (DCB) tests were conducted on four bond line thickness: 0.30, 0.56, 0.81
and 1.57 mm. The Compliance Based Beam Method (CBBM) was used to obtain the critical fracture toughness in mode I,
,
and the others σ-δ law parameters in mode I were obtained by fitting the numerical force-displacement (P-δ) curves to the experimental P-δ curves. The
sensitivity analysis performed revealed that the P-δ curves can be fitted with either a triangular or a trapezoidal σ-δ law. Furthermore, although
parameters could be calibrated to fit the P-δ loading phase with good accuracy, it wasn’t possible to simultaneously calibrate the delamination phase.
Further work is needed to address this particular problem in the employed model. The results revealed a linearly increasing dependency of
with the adhesive thickness from 3.43 N/mm for t = 0.30 mm to 7.89 N/mm for
t = 1.57 mm. The parameters and
K are almost unaffected by variations on bond thickness staying close to the values of 24 MPa and 120
N/mm respectively.
Authors
Topic
Citation
de Oliveira, M., Ávila, A., Chaves, R., Nascimento Júnior, H. et al., "Effects of adhesive thickness on the mode I cohesive zone model parameters of a high toughness structural adhesive," SAE Technical Paper 2018-36-0071, 2018, https://doi.org/10.4271/2018-36-0071.Data Sets - Support Documents
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References
- Petrie , E. M. Handbook of Adhesives and Sealants New York McGraw-Hill 2000 885
- Bascom , W. D. ; Cottingtion , R. L. ; Jones , R. L. ; Peyser , P. The Fracture of Epoxy- and Elastomer-Modified Epoxy Polymers in Bulk and as Adhesives JOURNAL OF APPLIED POLYMER SCIENCE 19 2545 2562 1975
- Kin Loch , A. J. ; Shaw , S. J. The Fracture Resistance of a Toughened Epoxy Adhesive The Journal of Adhesion 12 1 59 77 1981
- Quan , D. ; Murphy , N. ; Ivankovic , A. Fracture behaviour of a rubber nano-modified structural epoxy adhesive: Bond gap effects and fracture damage zone International Journal of Adhesion and Adhesives 77 138 150 2017
- Lee , D. ; Ikeda , T. ; Miyazaki , N. ; Choi , N. Effect of Bond Thickness on the Fracture Toughness of Adhesive Joints ASME. J. Eng. Mater. Technol. 2004 126 1 14 18 10.1115/1.1631433
- da Silva , L. F. M. ; de Magalhães , F. A. C. R. G. ; Chaves , F. J. P. ; de Moura , M. F. S. F. Mode II Fracture Toughness of a Brittle and a Ductile Adhesive as a Function of the Adhesive Thickness The Journal of Adhesion 86 9 891 905 10.1080/00218464.2010.506155 2010
- Marzi , S. ; Biel , A. ; Stigh , U. On experimental methods to investigate the effect of layer thickness on the fracture behavior of adhesively bonded joints International Journal of Adhesion & Adhesives 31 840 850 2011
- Carlberger , T. ; Stigh , U. Influence of Layer Thickness on Cohesive Properties of an Epoxy-Based Adhesive—An Experimental Study The Journal of Adhesion 86 8 816 835 10.1080/00218464.2010.498718 2010
- da Silva , L. F. M. ; Ochsner , A. ; Adams , R. D. Handbook of Adhesion Technology Springer 2011 2
- Azevedo , J. C. S. 2014
- de Moura , M. F. S. F. ; Campilho , R. D. S. G. ; Gonçalves , J. P. M. Crack equivalent concept applied to the fracture characterization of bonded joints under pure mode I loading Composites Science and Technology 68 2224 2230 2008
- de Moura , M. F. S. F. ; Campilho , R. D. S. G. ; Gonçalves , J. P. M. Pure mode II fracture characterization of composite bonded joints International Journal of Solids and Structures 46 1589 1595 2009
- Leitão , A. C. C. 2015
- Faneco , T. M. S. Caraterização das propriedades mecânicas de um adesivo estrutural de alta ductilidade Departamento de Engenharia Mecânica, Instituto Superior de Engenharia do Porto Portugal 2014
- Soares , A. P. O. A. L. Determinação da tenacidade à fratura de adesivos estruturais em modo misto pelo ensaio Single-Leg Bending 2015
- May , M. ; Hesebeck , O. ; Marzi , S. ; Bohme , W. ; Lienhard , J. ; Kilchert , S. ; Brede , M. ; Hiermaier , S. Rate dependent behavior of crash-optimized adhesives – Experimental characterization, model development, and simulation Engineering Fracture Mechanics 133 112 137 2015
- Canto , C. M. S. Strength and Fracture Energy of Adhesives For The Automotive Industry 2013
- Stigh , U. ; Alfredsson , K. S. ; Biel , A. Measurement of cohesive laws and related problems Proceedings of the ASME International Mechanical Engineering Congress and Exposition, IMECE2009-10474 2009
- Monteiro , J. P. R. ; Campilho , R. D. S. G. ; Marques , E. A. S ; DA Silva , L. F. M. Experimental estimation of the mechanical and fracture properties of a new epoxy adhesive Applied Adhesion Science https://doi.org/10.1186/s40563-015-0056-y 2015
- Campilho , R. D. S. G. ; de Moura , M. F. S. F. ; Pinto , A. M. G. ; Domingues , J. J. L. Modelling the tensile fracture behavior of CFRP scarf repairs Composites: Part B 40 149 157 2009
- BETAMATE TM 1496S Technical Information, Dow® 2013
- Dias , G. F. 2012
- Chen , X. Numerical Study of Stable Tearing Crack Growth Events Using the Cohesive Zone Model Approach 2013
- Moller , J. ; Hunter , R. ; Molina , J. ; Vizán , A. ; Peréz , J. ; da Silva , L. F. M. Influence of the temperature on the fracture energy of a methacrylate adhesive for mining applications Applied Adhesion Science 10.1186/s40563-015-0041-5 2015