ゴム系オーゼティック材における変形挙動のFEM解析

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  • Finite element analysis of deformation behavior in auxetic rubber material

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In this study, the deformation behavior of auxetic materials was evaluated by finite element analysis. The auxetic materials have periodic voids. Volume of auxetic materials decreases and the density increases under compression. This kind of behavior called self-contraction. This phenomenon occurs in the case of the model has specific rotational structure. The auxetic materials in impact protector devices enhanced energy absorption. In this paper, the 2-dimensional FE models ware applied to observe the structural rotation under compress deformation. The smaller the lateral strain for vertical compression, the higher the self-contractility. As the result of analysis, model with elliptical voids does not self-contract at low compression state because the structure rotation was small. Model with dumbbell-shaped voids showed good deformation behavior of almost constant self-contractility regardless of the compression state. However, the deformable range is narrowed due to contact of the inner wall. A more rotatable structure promotes better self-contracting behavior.

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