Strength prediction of adhesively bonded joints under cyclic thermal loading using a cohesive zone model

Abstract Structural adhesives are being widely adopted in aerospace and automobile industries. However, in many cases, hostile environments cause non-ignorable degradation in joints mechanical performance. In this work, a combined experimental–numerical approach was developed to characterise the effect of cyclic-temperature environment on adhesively bonded joints. The environmental degradation factor, Deg, was introduced into a cohesive zone model to evaluate the degradation process in the adhesive layer caused by the cyclic-temperature environment and the stress states in adhesive layer before and after temperature exposure treatment were investigated. Carefully designed experimental tests were carried out to validate the simulation results and help the numerical procedure to predict joint mechanical behaviour after environmental exposure. A response surface method was utilised to provide a better visualisation on the relationship between selected factors and response. Finally, the scanning electron microscopy was carried out to investigate the micro fracture mechanisms of adhesively bonded joints.

[1]  Robert D. Adams,et al.  Joint strength predictions for adhesive joints to be used over a wide temperature range , 2007 .

[2]  M. D. de Moura,et al.  Single-Lap Joints of Similar and Dissimilar Adherends Bonded with an Acrylic Adhesive , 2009 .

[3]  P. Hu,et al.  Effect of Temperature on Shear Strength of Adhesively Bonded Joints for Automobile Industry , 2011 .

[4]  Sung-Hoon Ahn,et al.  Repair of Composite Laminates-I: Test Results , 1998 .

[5]  J. P. Sargent,et al.  Characterisation of moisture-dependent cohesive zone properties for adhesively bonded joints , 2010 .

[6]  J. Ferreira,et al.  Effect of adherend's rigidity on the shear strength of single lap adhesive joints , 2011 .

[7]  I. Ashcroft,et al.  Fatigue damage modelling of adhesively bonded joints under variable amplitude loading using a cohesive zone model , 2011 .

[8]  F. L. Matthews,et al.  Measuring and predicting the durability of bonded carbon fibre/epoxy composite joints , 1991 .

[9]  V. Sauvant-Moynot,et al.  Prediction of long term strength of adhesively bonded steel/epoxy joints in sea water , 2009 .

[10]  A. D. Crocombe,et al.  Predicting fatigue damage in adhesively bonded joints using a cohesive zone model , 2010 .

[11]  J. Morais,et al.  Experimental and numerical evaluation of composite repairs on wood beams damaged by cross-graining , 2010 .

[12]  A. Kinloch.  Adhesion and Adhesives: Science and Technology , 2010 .

[13]  J. Vinson,et al.  On the use of quasi-dynamic modeling for composite material structures: Analysis of adhesively bonded joints with midplane asymmetry and transverse shear deformation , 2006 .

[14]  Liyong Tong,et al.  Fully-coupled nonlinear analysis of single lap adhesive joints , 2007 .

[15]  K. Shin,et al.  Bond Parameters to Improve Tensile Load Bearing Capacities of Co-Cured Single and Double Lap Joints with Steel and Carbon Fiber-epoxy Composite Adherends , 2003 .

[16]  Effect of moisture content in uncured adhesive on static strength of bonded galvanized DP600 steel joints , 2011 .

[17]  Soo-Ik Oh,et al.  Cylindrical tube optimization using response surface method based on stochastic process , 2002 .

[18]  M.F.S.F. de Moura,et al.  Crack equivalent concept applied to the fracture characterization of bonded joints under pure mode I loading , 2008 .

[19]  G. I. Barenblatt.  THE MATHEMATICAL THEORY OF EQUILIBRIUM CRACKS IN BRITTLE FRACTURE , 1962 .

[20]  Messler,et al.  Joining of Advanced Materials , 1993 .

[21]  S. Panigrahi,et al.  Three Dimensional Failure Analysis and Damage Propagation Behavior of Adhesively Bonded Single Lap Joints in Laminated FRP Composites , 2007 .

[22]  A. Higgins.  Adhesive bonding of aircraft structures , 2000 .

[24]  L.F.M. da Silva,et al.  Mode I fracture toughness of adhesively bonded joints as a function of temperature: Experimental and numerical study , 2011 .

[25]  Erol Sancaktar.  Fracture aspects of adhesive joints: material, fatigue, interphase, and stress concentration considerations , 1995 .

[26]  A. Hillerborg,et al.  Analysis of crack formation and crack growth in concrete by means of fracture mechanics and finite elements , 1976 .

[27]  M. Banea,et al.  Strength Improvement of Adhesively-Bonded Joints Using a Reverse-Bent Geometry , 2011 .

[28]  L.F.M. da Silva,et al.  Strength prediction of single- and double-lap joints by standard and extended finite element modelling , 2011 .

[29]  C. Liljedahl.  Modelling the interfacial degradation in adhesively bonded joints , 2006 .

[30]  Massimiliano Avalle,et al.  Design optimization by response surface methodology: application to crashworthiness design of vehicle structures , 2002 .

[31]  M. D. de Moura,et al.  Mode II Fracture Toughness of a Brittle and a Ductile Adhesive as a Function of the Adhesive Thickness , 2010 .

[32]  Lucas F. M. da Silvaa,et al.  Alternative Methods to Measure the Adhesive Shear Displacement in the Thick Adherend Shear Test , 2008 .

[33]  Magd Abdel Wahab,et al.  Modelling the environmental degradation of adhesively bonded aluminium and composite joints using a CZM approach , 2007 .

[34]  Raul D.S.G. Campilho,et al.  Effect of hole drilling at the overlap on the strength of single-lap joints , 2011 .