2018 Volume 54 Issue 10 Pages 358-366
Identification method of parameter values of an elasto-plastic continuum damage mechanics material modelfor finite element analysis（ FEA） was investigated using experimental results of cylindrical butt joint tests.Toughened Adhesive Polymer（ TAPO） Model［ MAT_252］, which expresses material behavior of adhesivesincluding elasto-plastic deformation and material damage, was adopted. Assuming the plane strain state,parameters included in constitutive equation, yield function, and non-associated flow law were identified.Using the obtained values, cylindrical butt joint tests and double cantilever beam（ DCB） test were numericallyconducted. Several difficulties were found in fitting in the plastically deformed area with the combined loads,and in the damaged area excluding the pure torsion load. Thus, it was indicated that parameter tuning of theyield function parameters, the plastic potential parameter for hydrostatic stress term, some of the Johnson& Cook failure parameters, and exponent of the phenomenological damage model would be required formore preferable results. Comparison of the numerical results with the experimental results showed that theparameter identification method assuming plane strain state can be applied to the finite element analysis ofadhesive joints.
