A Study on the Adhesion of Metals (Report 1)

Abstract

The mechanical properties of adhesive joints of metals and the cured adhesive used in the experiment were examined. Mild steel, copper, aluminium etc. were used for the adherend but as an adhesive, the epoxy-adhesive was employed.
The results are summarized as follows:
1) As the curing process of adhesive advances, the adhesive strength increases bnd there is almost no change in adhesive strength after about 70 hours. In 6 months, the adhesive strength slightly decreases because of aging.
2) In the case of narrow adhesive joint clearance up to 0.2 mm, the narrower the clearance is, the more the adhesive strength decreases. This is probably caused by the defects such as blowholes.
3) In the tensile test, owing to the rise of temperature of atmosphere, the adhesive strength decreases remarkably and then at the low temperature below 0°C, there are some cases where the adhesive strength decreases.
This tendency of the adhesive joint is similar to that of the cured adhesive, even if the fracture of the adhesive joint occurs at the adhesive-adherend interface.
4) There was no significant difference in the adhesive strength among the various metals.