Generalization of unified transformation-plasticity constitutive equation with identified material parameters and the application to metallo-thermo-mechanical simulation.

具有确定材料参数的统一相变塑性本构方程的推广及其在金属热机械模拟中的应用。

• 批准号: 21560104
• 负责人: INOUE Tatsuo
• 金额: $ 2.91万
• 依托单位: Fukuyama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21560104/
• 关键词: 材料力学; 相変態; 変態・熱・力学; 統合型変態・熱塑性構成式; 材料パラメーター; 有限要素法; フェーズフィールド; フェズフィールド法; フェーズフィールド法

The project motivates to propose a model of evaluating the transformation plasticity, TP, coefficient by numerical calculation since identification of the coefficient so far needs complicated and time consuming experiments. A parallely connected two bar model consisted of mother and new phases is proposed : Tensile stress occurs in mother phase with larger thermal expansion coefficient in the course of cooling phase transformation, while compressive stress takes place in new phase with smaller coefficient in new phase. A tensile external stress even lower than yield stress is accelerated by the initial tensile stress in mother phase easily reaches yielding followed by plastic deformation. Simple thermo-elastic-plastic theory is employed to numerically calculate the rate and the current value of stress and strain in both phases depending on the amount of externally applied stress by use of material parameters for stress-strain relation and phase transformation kinetics characterized to material focused. Deviation of induced strain subjected to external stress from that of zero stress is now regarded as TP strain, and the TP coefficient is obtained by the TP strain divided by the external stress.

该项目旨在提出一种通过数值计算评估相变塑性（TP）系数的模型，因为迄今为止识别该系数需要复杂且耗时的实验。提出了由母相和新相组成的并联两杆模型：在冷却相变过程中，热膨胀系数较大的母相中产生拉应力，而新相中热膨胀系数较小的新相中产生压应力。即使低于屈服应力的拉伸外应力也会因母相中的初始拉伸应力而加速，容易达到屈服，随后发生塑性变形。采用简单的热弹塑性理论，通过使用应力应变关系的材料参数和材料表征的相变动力学，数值计算取决于外部施加应力大小的两相应力和应变的速率和当前值专注。现在将受到外部应力的诱导应变与零应力的偏差视为TP应变，TP系数由TP应变除以外部应力得到。

项目成果

Finite Element Analysis of Deformation and Residual Stress in Induction Hardened Steel Bar

感应淬火钢棒变形和残余应力的有限元分析

• 发表时间: 2009
• 期刊: 熱処理, 49-Special Issue
• 作者: K.Okamura;K.Yamamoto;T.Saitoh;M.Fukumoto;H.Nogami;K.Okamura;T.Sugimoto;Y.Watanabe;M.Narazaki
• 通讯作者: M.Narazaki

井上達雄

井上龙夫

曲げ加工した平板の焼入れ過程のシミュレーションとそれに及ぼす変態塑性効果

弯曲平板淬火过程模拟及相变塑性对其的影响

• 发表时间: 2011
• 期刊: 熱処理
• 作者: 井上達雄;岸本飛鳥
• 通讯作者: 岸本飛鳥

Drug Delivery Observation of Hydrophobe Ferrofluid and Magnetite Nanoparticals by SPring-8 Synchrotron Radiation

SPring-8 同步辐射观察疏水铁磁流体和磁铁矿纳米颗粒的药物输送

• 发表时间: 2011
• 期刊: Journal of Nanoscience and Nanotechnology
• 作者: D. Y. Ju;P. Bian;T. Kumazawa;M. Nakano;H. Matsuura;K. Umetani;T. Komdo;Y. Uozumi;K. Makino;N. Noda;K. Koide;M. Akutsu and K. Masuyama
• 通讯作者: M. Akutsu and K. Masuyama

Analysis of a Steering Rack Shaft Subjected to High-Frequency Induction Hardening Process

高频感应淬火转向架轴的分析

• 发表时间: 2009
• 期刊: 熱処理, 49-Special Issue
• 作者: M.Ogawa;K.Okamura;K.Yamamoto;M.Kobayash
• 通讯作者: M.Kobayash