To evaluate the shear adhesion properties of urethane resins, the measurements of displacement were carried out using the developed testing apparatus during which time the shearing load was applied to a specimen in horizontal direction. As the fitting results of experimental data, the viscoelastic model was effectively adapted for micro deformation under the low shearing load. The influence of adherend material for the deformation of PSA was passable to evaluate by the relaxation time in the coefficients of estimated model. Analysis of variance on the relaxation time show that the effect of adherend materials was recognized at later loading time.
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