本研究では, 強い異方性を示す薄板材を用いた成形シミュレーションの精度向上および破壊予測精度向上を目的とした材料モデル構築を行い, 複層鋼板およびアルミニウム合金板を用いた検証を行った。本モデルは異方性表現能力の向上を達成するために, 降伏応力異方性と変形異方性を独立評価できる非関連流れ則に基づいた定式化が行われた。SUS304とSUS420J2からなる複層鋼板とアルミニウム合金板A6016-T6を用意し, 破壊予測シミュレーションと材料パラメータを決定するための実験を行った。これらの解析と実験の結果, 従来モデルでは不可能な力学特性の分析が可能となり, 提案モデルの有用性が明らかとなった。
In this study, a novel material model have been developed for advanced metallic sheets with multilayer structure and anisotropy. The proposed material model is based on non-associated flow rule to describe the yield surface and plastic potential surface independently. This treatment is expected to work well with metallic sheet with strong anisotropy. The developed model was evaluated through experiments with multilayer steel sheets, stainless steel sheets and aluminum alloy sheets. These experimental investigations proved the effectiveness of the model so far. In addition, fracture prediction analysis has been conducted by using 3D bifurcation theory. In this analysis, it was revealed that the orders of the yield and the plastic potential function have influence on the shape of fracture limit curves. Although some problems remain unsolved, the majority of the original plans was carried out and fruitful results were obtained.

研究種目 : 若手研究(B)
研究期間 : 2014～2015
課題番号 : 26820023
研究分野 : 塑性力学