TY - JOUR
T1 - Simulation of shrinkage during sintering of additively manufactured silica green bodies
AU - Kakanuru, Padmalatha
AU - Pochiraju, Kishore
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/8
Y1 - 2022/8
N2 - Green bodies with ceramic particles and polymer binders can be shaped with additive manufacturing (3D-printing) techniques without the need for a mold. The dimensions and properties of the final ceramic part produced from printed green bodies depend on the porosity created from polymer burn-off and the densification of the ceramic particles during the post-printing steps. Predictions of the part dimensions and the internal stress states of the final ceramic part can assist the designers in properly sizing and shaping the green body. In this paper, the SOVS model was implemented in a three-dimensional finite element software as a user-defined creep model. The parameters required for the SOVS model, namely viscosity and surface energy, were calibrated by minimizing the error between predicted and experimental relative densities. The parameters were obtained using an error measure definition and minimizing the error with the well-known Differential Evolution global optimization. The dimensional changes of selected additively manufactured green bodies through the polymer burn-off and sintering process are analyzed. Density changes are tracked through the time-temperature cycles typically used to create ceramic parts from their green bodies.
AB - Green bodies with ceramic particles and polymer binders can be shaped with additive manufacturing (3D-printing) techniques without the need for a mold. The dimensions and properties of the final ceramic part produced from printed green bodies depend on the porosity created from polymer burn-off and the densification of the ceramic particles during the post-printing steps. Predictions of the part dimensions and the internal stress states of the final ceramic part can assist the designers in properly sizing and shaping the green body. In this paper, the SOVS model was implemented in a three-dimensional finite element software as a user-defined creep model. The parameters required for the SOVS model, namely viscosity and surface energy, were calibrated by minimizing the error between predicted and experimental relative densities. The parameters were obtained using an error measure definition and minimizing the error with the well-known Differential Evolution global optimization. The dimensional changes of selected additively manufactured green bodies through the polymer burn-off and sintering process are analyzed. Density changes are tracked through the time-temperature cycles typically used to create ceramic parts from their green bodies.
KW - Additive manufacturing
KW - Anisotropic Shrinkage
KW - Creep
KW - Finite element modeling
KW - Optimization
KW - SOVS model
KW - Silica ceramics
KW - Sintering
KW - Stereolithography
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U2 - 10.1016/j.addma.2022.102908
DO - 10.1016/j.addma.2022.102908
M3 - Article
AN - SCOPUS:85132370028
VL - 56
JO - Additive Manufacturing
JF - Additive Manufacturing
M1 - 102908
ER -