Pull-off test of adhesive joints based on polyester-glass laminate and aluminum alloy

Abstract

Adhesive joints are widely used in various industries to join different materials. They always have to meet specific requirements for joint strength or durability. The article presents the results of research on the problem of joining elements made of aluminum alloy and polymer composite material present in the railway industry. The tested adhesive joints combine EN AW- 5754 aluminum alloy (AIMg3) with a polyester-glass laminate. Three types of adhesives were used in the tests: epoxy, methacrylic and cyanoacrylate. Various methods of preparing the base surface and the bonded elements were used. The adhesive bonded surfaces were prepared using sandblasting and degreasing, grinding and degreasing as well as only degreasing. The research used a composite made with the use of two different technologies: contact molding and vacuum molding. Comparative tests were also carried out by making adhesive joints of two aluminum surfaces. The aim of the research was to propose a gluing technology to achieve min 15 MPa of the pull-off strength. The tests show that the required strength of the joint can be achieved only for an adhesive joint based on epoxy or methacrylic adhesive when preparing the surface of the base material by sanding and degreasing, grinding and degreasing, or even only degreasing.

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