抄録
In this study, strength of epoxy adhesively bonded scarf joints of dissimilar metals, namely SUS304 stainless steel and YH75 aluminium alloy was examined on several scarf angles and various bond thickness under pure mode I loading. Scarf angle, θ=45°, 60° and 75° were employed. The bond thickness, t between dissimilar metals was controlled to be ranged between 0.1 mm to 1.2 mm. Finite element analysis was also executed to investigate the stress distribution in the scarf joints by ANSYS 11 code. Stress multiaxiality of scarf joints slightly increases as the scarf angle increases. From analytical solutions, stress singularity exists most pronoundcedly at steel/adhesive interface corner of joint having 45° to 75° scarf angle and this is in agreement with FE analyses and in confirmed by fracture observations wherein the fracture has always been initiated at this point. The apparent Young's modulus of adhesive layer in scarf joints is found to be 1.5〜5 times higher than those of bulk epoxy adhesive, which obtained from tensile tests.
