Influence of adhesive thickness and filler content on the mechanical performance of aluminum single-lap joints bonded with aluminum powder filled epoxy adhesive

Abstract The objective of this study was to develop information on the influence of adhesive thickness and aluminum filler content on the mechanical performance of aluminum joints bonded by aluminum powder filled epoxy. The adhesive strength of the joints was determined by utilizing the single-lap shear test. The influence of adhesive thickness and aluminum filler content on stress distribution within the adhesive was also analyzed by finite element method (FEM). Both FEM analysis and the experimental investigation show that in general adhesion strength decreases as the thickness of the adhesive increases. It is observed from the predictions (FEM simulations) that the stress level increases at the adhesive–metal substrate interface as the aluminum filler content in the adhesive increases. Experimental results show that epoxy adhesive retains its strength up to the 50 wt% aluminum filler content. The joints fail in cohesive mode (failure within the adhesive) due to the high stress levels generated in the adhesive, which indicates that the adhesion to the metal surface is stronger than that of the interior part of the adhesive.

[1]  W. Wake,et al.  The Variation of Bond Strength with Temperature: A Preliminary Study of Metal-to-Metal Adhesion , 1970 .

[2]  A. Beevers.  Coaxial joints in engineering assembly , 1986 .

[3]  T. Masuko,et al.  Dynamic viscoelastic properties and thermal properties of Ni powder–epoxy resin composites , 1998 .

[4]  Guk-Rwang Won.  American Society for Testing and Materials , 1987 .

[5]  B. Steverding,et al.  Thermal conductivity of epoxy-aluminium powder mixtures , 1977 .

[6]  Henry Lee,et al.  Handbook of Epoxy Resins , 1967 .

[7]  I. Olefjord,et al.  Surface treatment of steel for structural adhesive bonding , 1987 .

[8]  Behavior of adhesive joints in corrosive environment , 1987 .

[9]  Z. Szklarska‐Śmiałowska,et al.  Effect of fillers on the degradation of automotive epoxy adhesives in aqueous solutions , 1993, Journal of Materials Science.

[10]  I. C. Hogg,et al.  Surface preparation of adhesively bonded joints , 1993 .

[11]  I. Olefjord,et al.  Basic processes of surface preparation and bond formation of adhesively joined aluminium , 1987 .

[12]  野村 昭一郎.  W.D.Kingery: Property Measurements at High Temperatures. John Wiley and Sons, Inc., New York, Chapman and Hall, Limited, London. 1959年, 416頁, 18×26cm, 6,600円. , 1960 .

[13]  Comparison of the Shear Stress-strain Behaviour of some Structural Adhesives , 1985 .

[14]  Sampath Purushothaman,et al.  Development of low cost, low temperature conductive adhesives , 1998, 1998 Proceedings. 48th Electronic Components and Technology Conference (Cat. No.98CH36206).

[15]  K. L. Mittal,et al.  Adhesive Joints: Formation, Characteristics and Testing , 2023 .

[16]  M. Tsai,et al.  A Note on Peel Stresses in Single-Lap Adhesive Joints , 1994 .

[17]  Daoqiang Lu,et al.  Conductivity mechanisms of isotropic conductive adhesives (ICAs) , 1999, Proceedings International Symposium on Advanced Packaging Materials. Processes, Properties and Interfaces (IEEE Cat. No.99TH8405).

[18]  Anthony J. Kinloch,et al.  Durability of structural adhesives , 1983 .

[19]  I. H. Marshall,et al.  A Finite Element Assessment of Clamping Effects in Composite Bolted Joints , 1989 .

[20]  W. D. Kingery,et al.  Introduction to Ceramics , 1976 .

[21]  D. M. Brewis,et al.  Factors affecting bonding of metals , 1986 .

[22]  Thermal conductivity of epoxy resin-aluminium , 1977 .