Modeling of gravity-induced shape distortions during sintering of cylindrical specimens

A finite element approach for modeling the gravity-affected sintering process is presented. The constitutive equations are based on the continuum theory of sintering in the framework of a linear viscous material behavior. The model describes the gravity influence on porosity evolution and shrinkage inhomogeneity. Simulations of densification, shape distortion, and porosity gradients are presented. The results are compared with a previously developed analytical model of sintering under the influence of gravity. First time a direct assessment of the impact of the densification inhomogeneity on the gravity-induced shape distortion during sintering is provided in a generic form similar to the master sintering curve approach.

► The impact of the sintering densification on the gravity-induced shape distortion is described.
► The influence of specimen's geometry and gravity acceleration on shape distortion is determined.
► The numerical results compare favorably with an analytical model developed by Olevsky and German.