This paper describes an experimental procedure to validate numerical models used to simulate powder pressing. It consists mainly of two steps: closed die uniaxial pressing followed by isostatic pressing. The uniaxial pressing causes a non-homogeneous density distribution in the pressing direction as a consequence of friction between die walls and powder. In the isostatic pressing, less compacted regions have a larger volumetric strain, resulting in a non-trivial shape of the re-compacted part, which computes indirectly the previous density distribution. Experimental data from both steps are compared to the results from finite element models. The Drucker-Prager/Cap constitutive model was used to represent the compaction of alumina powder. Several simulations covering a range of parameters obtained from the literature were performed to calibrate the model, through an inverse analysis. The developed procedure sheds a light in the methods to calibrate and/or validate constitutive models used for powder pressing.

本文介绍了一种实验程序，以验证用于模拟粉末压制的数值模型。它主要包括两个步骤：闭模单轴压制，然后是等静压制。由于模具壁和粉末之间的摩擦，单轴压制导致压制方向上的密度分布不​​均匀。在等静压过程中，压实程度较低的区域具有较大的体积应变，从而导致重新压实的零件具有非平凡的形状，从而间接计算出先前的密度分布。将两个步骤的实验数据与有限元模型的结果进行比较。Drucker-Prager / Cap本构模型用于表示氧化铝粉末的压实。通过反分析，进行了涵盖从文献中获得的一系列参数范围的若干模拟，以校准模型。所开发的程序阐明了用于校准和/或验证用于粉末压制的本构模型的方法。