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A novel phenomenological model using a sine function for finite-element simulation of large-strain hot deformation

查看全文 作　　者：ZENG [1]Fan;HU [1]ChengLiang;ZHAO [1]Zhen 高影响力作者 机构地区：[1]Institute of Forming Technology & Equipment, Shanghai Jiao Tong University高影响力机构 出　　处：《Science China(Technological Sciences)》索引2018年第61卷第5期,共13页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(Grant No.51475294) 摘　　要：In hot deformation, the flow stress curves of steels always present as two typical types: at relatively high temperature and low strain rate, the flow stress may first increase and then attain a steady value without reaching an obvious peak stress; in other situations, the flow stress decreases after reaching peak stress and then attains a steady value. A new phenomenological model,described by a sine-function equation, is proposed to define the relationship between flow stress and deformation parameters. A series of isothermal compressions for a carbon steel were carried out, as a case study, to obtain basic experimental data.Parameters of the new model were sequentially determined. The predicted results of the proposed model were compared with actual measured data. Good accuracy was found in the standard statistical parameters of correlation coefficient, root mean square error, and average absolute relative error with the values of 0.935, 7.137 MPa and 4.352%, respectively. Discussion of applications of different models in finite-element simulation demonstrated the benefit of the new model. When comparing the simulation results of three different deformation patterns with large strain, the new model showed 10%–20% lower predicted forming load than the original Arrhenius equation, and better applicability and reliability than modified Arrhenius equations. 关 键 词：模型显示 有限元素 现象学 模拟 ARRHENIUS 正弦 流动压力 测量数据
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