有限要素シミュレーションを用いた多段圧粉成形における除荷時の工具弾性回復による割れ発生の予測

概要

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The initiation of fracture induced in a compact by the difference between the elastic recoveries of tools during the unloading process of multi-level powder compaction is predicted from calculated results by finite element simulation. The loading and unloading processes in the compaction are simulated by the rigid-plastic and elastic finite element methods, respectively. In these simulations, elastic tools are modeled as springs connected with the nodal points on the interfaces between the compact and tools. This modeling leads to simple treatment of coupling of the tools and compact. The initiation of fracture is evaluated from the maximum principal stress, and the critical stress is measured by means of bending and shearing tests. Two-level compaction operations are simulated by the finite element method to predict the initiation of fracture. The predicted critical values of relative density for the occurrence of fracture are in good agreement with the experimental ones for iron powder compacts.
一般社団法人日本機械学会の論文
1998-12-25