Description of nonlinear viscoelastic behavior and creep-rupture time of anisotropic conductive film

A nonlinear viscoelastic model is developed to describe the mechanical behaviors of anisotropic conductive film (ACF). ACF's creep properties are predicted by the model with different stress levels at different temperatures and it is found that the prediction results agree with the experimental ones well. The tensile tests were carried out to validate the model in the situation where both stresses and strains change with time and the results show that the model ensures fair prediction of ACF's tensile mechanical behaviors under time-dependent loading without any additional fitting of adjustable parameters. It is also found that ACF's mechanical behaviors are dependent on the testing temperature and loading rate. A nonlinear viscoelastic model considering aging damage is constructed based on time-aging damage superposition principle and is validated. The creep-rupture time of ACF is predicted based on the modified R-W criterion, and the predicted values agree with experimental data well.