Experimental Analysis of Compression Deformation at High-Temperatures and Numerical Simulation for BaTiO₃ Sintered Compacts

Abstract

Uni-axial compression tests were performed to derive yield stress equation, flow rules and coefficient of flow stress of BaTiO₃ sintered compaction. These basic equations and their physical properties were introduced into the FEM. The drooping behavior of the thin-thickness specimen during the sintering was simulated and compared to the experimental drooping, where the specimens were composed of large or small average diameter BaTiO₃, respectively. Resulting simulation drooping quantitatively reproduces that experiment. This result suggests that experimentally derived yield stress equation, non-Newtonian viscoplastic flow rule 𝜎_eq = 𝐹𝜀⁰𝜀̇^0.8 and coefficient of flow stress about several to 1000 GPa s of sintered BaTiO₃ compaction were numerically validated.