構造用エポキシ系接着剤バルク材の変形挙動のひずみ速度依存性 : 第2報,三次元構成式定式化と有限要素シミュレーション

概要

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A three dimensional constitutive model is formulated to describe the deformation behavior of an epoxy resin structural adhesive in a wide range of strain rate. This formulation is based on a four elements model with an elastic series element by considering that the adhesive is a glassy polymer. The plastic streching tensor is expressed by the effective stress, which is the difference between the total stress and back stress, and the plastic shear strain rate proposed previously by the authors. The stress tensor at each relaxation process can be obtained by a solution of non-linear simultaneous equation under an assumption which both plastic stretching tensors at each relaxation process are equivalent. The formulated constitutive model is implemented into the commercial FE code ABAQUS/Explicit and then a computational simulation is performed. As the result, a validity of the proposed model is shown by comparing the previously-obtained experimental result. In order to check the capability of this model, the deformation behavior and the strain sensitivity of CTBN modified adhesive are experimentally investigated by using an INSTRON-type material testing machine and a split Hopkinson pressure bar apparatus. Finally, it is shown that the proposed model can be also applied for a prediction of the deformation behavior of the different adhesives by comparing with the newly-obtained experimental result.
社団法人日本機械学会の論文
2009-10-25