傾斜積層粉末材の焼結における不均一収縮のFEMシミュレーションと割れ発生の予測

概要

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Non-uniform shrinkage in sintering of graded laminated powder compacts is simulated by a viscoplastic finite element method to predict the shapes of the sintered products. Since the component of the compact grades in the thickness direction, the sintered product is distorted by a non-uniform distribution of shrinltage. In the finite element method, the shrinkage behavior in the sintering is modeled by a distribution of volumetric strain-rate relating to the material and density in the compact, and viscoplastic deformation induced by the distribution is calculated. The shrinkage behavior in sintering of circular graded compacts consisting of zirconia and alumina powders is simulated. The calculated shape of the sintered graded product is in good agreement with the experimental one. The occurrence of sintering fracture is predicted from the difference in volumetric strain between non-uniform and uniform shrinkages. In addition, the geometry of the compact is optimized in the finite element simulation to produce a flat product without curvature.
一般社団法人日本機械学会の論文
1999-02-25