FEMによるプリネル硬さの解析 : 第2報,弾線形硬化塑性材料についての解析と実用材料の硬さとの関係

概要

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The Brinell hardness H_B of elastic-linear-hardening materials with various yield stresses and hardening moduli is analyzed by FEM. The applicability of the empirical formula for the ratio of tensile strength σ_B(MPa) to H_B(kgf/mm^2), σ_B/H_B ≌ 3.5 is lost for materials having large relative strain hardening modulus H/σ_S, where H is the strain hardening modulus in σ-ε curve and σ_S is the yield stress. The dimensionless stress〜strain curves (σ/σ_S〜ε) of elastic-linear-hardening materials and those of various actual metals give the crucial measure to determine the value of σ_B/H_B. The ratio of σ_B/H_B remains in the range 3.3〜3.8, if the relative strain hardening modulus H/σ_S is less than 〜2.5at large strain. Several other useful results such as indentation shapes, plastic zone size and residual stresses are also obtained.
一般社団法人日本機械学会の論文
1991-01-25