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通过分析纳米颗粒增强镁基复合材料半固态触变塑性成形中不同因素(应力σ、应变ε、应变速率ε、温度T、液相分数f_L、增强颗粒体积分数f_p)之间的关系,同时考虑Orowan增强机制,由此提出一种新的本构模型。该本构模型中各参数由多元非线性回归法演算而得。触变塑性成形实验数据与数值模拟数据吻合良好,证明推导的本构关系可用于触变塑性成形的数值模拟,并可用来指导复合材料的触变塑性成形工程实践。
By analyzing the relationship between the different factors (stress σ, strain ε, strain rate ε, temperature T, liquid fraction f_L, enhanced particle volume fraction f_p) in semi-solid state thixoforming of magnesium matrix composites reinforced by nano-particles, Orowan enhanced mechanism, thus proposed a new constitutive model. The parameters of this constitutive model are calculated by multivariate nonlinear regression. The experimental data of thixotropic plastic forming are in good agreement with the numerical simulation data, which proves that the derived constitutive relation can be used in the numerical simulation of thixotropic plastic forming and can be used to guide the thixo-plastic forming of composite materials.