We have carried out systematic experimental tests to evaluate the bonding strength and fracture toughness of adhesive joints. Our work has been published in Journal of Adhesion as one among the collection of papers honoring Prof. David Dillard for receiving the Adhesion Society Award for Excellence in Adhesion Science sponsored by 3M.
Our experimental investigations have determined the shear, tensile and fracture properties of adhesive joints with bonded same-material (polymer-polymer) and bi-materials (metal-polymer) combinations. The above figure depicts the bi-material joint designs which were used in eliminating stress singularities at the metal-polymer interfaces. Full-field optical techniques including photoelasticity and coherent gradient sensing (CGS) were employed to record the stress development and failure in the adhesive joints. We have five different types of adhesives (Loctite-384, Loctite 330, Loctite 5084, Weldon-10, and Polyester) with five different types of materials (Aluminum, Polycarbonate, PMMA, Steel and Homalite) to generate several material combinations. This leads to a wide variety of carefully measured data which will be beneficial for computational simulations on failure mechanics of adhesive joints.
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| Krishnan-Xu-2011-JA.pdf | 1.19 MB |