Experimental study on the constitutive model of optically clear adhesive films under rapid loading

Abstract The mechanical properties of optically clear adhesive (OCA) films can be anisotropy and viscoelasticity, they are distinguished from conventional linear elasticity hyper‐elasticity. These should considered to analyze the interfacial stress, which plays an important role in evaluating failure a structure containing OCA. Based on well‐designed systematical experiments material's principal axes, phenomenological constitutive model OCA has been proposed transversely isotropic rate‐dependent form. For application large deformation cases, was developed by using true stress strain. Results show that well‐known assumption volume‐incompressibility is not appropriate for OCA, Poisson's ratio vary with loading rate current Considering mono‐axial behaviors along axes present strong non‐linearity, incremental three‐dimensional finite element method (FEM) implementation. By comparing traditional elastic hyperelastic models, numerical examination results give more accurate description experimental stress–strain curves.