Vol 7, No 3 (2016) > Metalurgy and Material Engineering >

Water Absorption and Desorption Behaviour and their Effect on the Tensile Properties of FM 73M Adhesive Film

Sugiman Sugiman, Sulardjaka Sulardjaka



adhesives have been widely used to join metal to metal, and metal to composite
in automotive and aircraft structures. However, the adhesive is susceptible to
water absorption from the surrounding
environment and this affects the mechanical properties of the adhesive, leading to reduction in the performance of the structure. This paper investigated the water
absorption and desorption behaviour of FM 73M structural adhesive film and its
effect on the tensile properties. The adhesive was immersed in deionised water
at a temperature of 50oC. A gravimetric method was carried out to
obtain the water uptake. Dog bone specimens were used to investigate the
residual tensile strength of the adhesive. Finite element modelling was
performed to model the spatial moisture distribution in the adhesive and the
residual tensile strength after having absorbed water. It was
found that the water absorption of FM 73M deviated from Fick's second law,
however the desorption behaviour followed Fick's second law. The tensile
properties of the adhesive (the tensile strength and the elastic
modulus) tend to decrease with the increase of water content and they are
recovered after desorption at the same temperature as the absorption. The
residual tensile strength was predicted using a continuum damage approach
combined with environmental degradation. Good agreement has been found
between the predicted and the experimental results.

Keywords: Adhesive; Finite element modelling; Tensile properties; Water absorption

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