弾性解と剛完全塑性解を利用した三角錐圧子押込みによる塑性特性評価法

概要

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A determination method for elastic-plastic material constants using plural triangular pyramid indenters, which was previously proposed by the authors, is improved in this study. The interpolation function П_<int> is simply determined based on two theoretical solutions for conical indenter penetration: the elastic solution and the rigid/perfectly plastic solution. The function П_<int> gives the relation between reduced Young's modulus E^*, load curvature C and representative stress σ_r. On C/σ_r versus E^*/σ_r plot, the elastic solution is expressed by a linear function and the rigid/perfectly plastic solution by a constant value. Both solutions give the extremes for П_<int>. With this П_<int> and another function, which relates representative strain ε_r to indenter apex angle φ, the stress-strain curve is identified. The good experimental results for real materials were obtained by this newly improved method.
2005-10-25