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基于塑性泊松比与相对密度的关系,在单轴压缩受力状态下建立金属粉末材料的致密化模型,探讨材料的致密化过程.通过对椭球体屈服准则几何性质研究,推导了屈服准则扁率、第一偏心率和第二偏心率等椭球体几何参数的表达形式.将单轴应力屈服准则与多种经验屈服准则进行对比,分析椭球体几何参数随相对密度的变化趋势.结果显示:单轴压缩致密化过程中,致密化模型预测相对密度与试验结果的最大相对误差为1.27%;单轴应力屈服准则和经验屈服准则的椭球体几何参数表现出一致的强化规律.
Based on the relationship between plastic Poisson’s ratio and relative density, a densification model of metal powder material under uniaxial compression was established to investigate the densification process of the material.According to the study of the geometrical properties of the yield criterion of ellipsoid, the yield criterion Rate, the first eccentricity and the second eccentricity ellipsoid geometrical parameters such as the expression of the form of uniaxial stress yield criterion and a variety of empirical yield criterion for comparison, analysis of ellipsoid geometric parameters with the relative density of the trend of the results show that: During the uniaxial compression densification process, the maximum relative error between the predicted relative densities and the experimental results is 1.27%. The uniaxial stress yield criterion and the empirical yield criterion show the same strengthening rules.