Abstract
The shear strength characterization of bonded joints involving adherends with a remarkably different stiffness has a peculiar interest in industrial applications. This work proposes and investigates three innovative specimens (an axisymmetric annular, a tensile and a torsional one) purposely developed to manage dissimilar adherends bonded with adhesive in thin film. A Thick Adherend Shear Test specimen between rigid adherends is used for the assessment of the adhesive by itself. The work focuses on metal-elastomeric polyurethane bonded joints with a solventbased adhesive. All the tests are performed through an axial dynamometer, using a purposely developed fixture to convert the tensile load in a torque for the torsional specimen. The tensile and the torsional specimens provide the most reliable shear strength characterization.
Highlights
Bonded joints between dissimilar adherends, in particular metal and elastomer with a thin adhesive layer in-between, can be found in many industrial applications
An axial load is applied to the specimen through fork pin fixtures on each ends, so as to obtain a pure shear loading on the bonded joint (Figure 1b)
The results show that the TAST-like and the torsional specimens are the most promising solutions
Summary
Bonded joints between dissimilar adherends, in particular metal and elastomer with a thin adhesive layer in-between, can be found in many industrial applications. In the offshore oil industry, rubber-metal bonded composites are used to protect the structure from seawater. This paper deals with the experimental characterization of the shear strength of this type of bonded joints. A few works can be traced in the literature about metal-elastomer joints. Stevenson [1], Hamade [2] and Liechti et al [3] evaluated the joint strength for metalrubber adherends in corrosive environment. Othman [4] studied the drawbacks of peel test for the assessment of metal-rubber joints. The ASTM D429 standard [5]-[6] suggests some specimens for testing metal-elastomer joints. Many works in the literature deal with the development of bonded specimens for the characterization of thin adhesive films between rigid
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