Mechanics of adhesive joints
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It is generally believed that when testing the strength of adhesive joints the most serious factor acting to reduce the measured strength is the stress concentration which is apt to occur near the peripheral edges of an adhesive layer under loading. Such an assumption seems, however, to be inadequate as far as the tensile test for a butt joint is concerned. According to our calculation, the validity of whose basis was verified by photoelastic experiments, the intensity of the stress concentration which may occur at the peripheral edges of an adhesive layer should be quite faint. Moreover it was found that though some irregular stress distribution occurs in the neighbourhood of free edges, the remaining region is kept in a state of uniform stress; i.e.,σ 1 =a y = 1F,σ 2 =σ x =vF andτ 12 = (1 -v)F/2, whereF is the mean tensile stress, andv is Poisson’s ratio of the adhesive material.
KeywordsStress Distribution Strain Energy Density Adhesive Layer Free Edge Adhesive Joint
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