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建立了钛合金空心整体结构成形过程的三维有限元模型.采用刚黏塑性本构关系,基于Marc有限元程序,分析了工艺参数对成形的影响.研究表明,扭转速度的提高使扭矩仅有较小的变化;当模具速度和应变速率提高时,热成形的成形力和超塑性成形的气压将提高.随成形温度降低,成形力显著提高,当温度高于900℃时,扭转成形的扭矩、热成形的成形力和超塑性成形的气体压力随温度的变化均不明显.在有限元分析的基础上,选取合适的工艺参数制备了钛合金空心整体结构模拟件,成形后的钛合金空心整体结构件面板厚度的实测值和模拟计算值具有相同的变化趋势,两者吻合良好.
A three-dimensional finite element model of titanium alloy hollow integral structure forming process was established. Based on Marc visco-plastic constitutive relation, the influence of process parameters on forming was analyzed based on Marc visco-plastic constitutive model. As the mold speed and strain rate increase, the thermoforming force and the superplastic forming pressure will increase.With the forming temperature decreases, the forming force increases significantly, when the temperature is higher than 900 ℃, the torsional forming torque, The thermoforming force and superplastic forming gas pressure are not obvious with the temperature changes.Based on the finite element analysis, titanium alloy hollow structural simulation parts were prepared by selecting appropriate technological parameters, The thickness of the structural panel measured values and simulated values have the same trend, the two agree well.