円すい圧子による超微小硬さの解析 : 第2報, 圧子先端部Rの大きさが表面の変形特性に及ぼす影響

概要

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Deformation around concavity created by indentation of a conical indenter in an ultramicrohardness tester is analyzed using FEM computer simulation. Effects of indenter tip radius on concavity shape and hardness from concavity depth both under loading and load-free conditions in soft material which has low yield stress and high work hardening rate are examined. The results obtained are as follows. (1) Concavity created by a conical indenter is sinking-in type including concavity rim. The larger tip radius and the deeper concavity depth make concavity rim more unclear. The maximum elastic recovery is at the bottom of concavity. (2) At the same depth the applied load increases linearly with tip radius. (3) An increase in tip radius makes the plastic zone broader and the maximum equivalent plastic strain at the bottom of concavity lower. The stress field around the concavity is compressive. (4) Correction of errors at the indenter tip is effective to a conical indenter with tip radius 0〜3μm.
社団法人日本機械学会の論文
1998-06-25