Characteristics of Adhesive Joints under Rate-Dependent Tensile Loading

Abstract:

Effects of loading rates on deformation and mechanical properties of adhesive joints are examined in this study. For this purpose, acrylic foam pressure sensitive adhesive (PSA) was employed with aluminum adherents. Tensile loading of the adhesive joint was applied at displacement rates ranging from 5 to 500 mm/min. Results show that the tensile load-displacement response is characterized by three regimes, namely an initial non-linear behavior with initiation of cavities, a hardening behavior through fibrillation process and the final fracture of the stretched fibrils. The strengths of the adhesive joints increases asymptotically from 0.56 to 1.92 MPa over the displacement rates from 5 to 500 mm/min. Both modulus and strain energy density at fracture reach optimum level around a displacement rate of 100 mm/min. Adhesive failure of the joint dominates at low loading rate (below 10 mm/min.) while cohesive failure is prominent at faster loading rates above 250 mm/min.

• Periodical: Applied Mechanics and Materials (Volume 660)
• Pages: 618-622
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.660.618
• Online since: October 2014
• Authors: Mahzan Johar, King Jye Wong, Mohd Nasir Tamin*
• Keywords: Adhesive Joints, Cohesive Failure, Fibrillation, Rate-Dependent, Strain Energy Density

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