DATE:

Friday, March 17, 2023

TIME:

3:30 PM

LOCATION:

GMCS 314

SPEAKER:

Dr. Elisa Torresani, Mechanical Engineering, San Diego State University

ABSTRACT:

To behavior of a porous body during sintering can be predicted using a model based on the continuum mechanics of sintering framework. This approach can be used to investigate the causes that induce deformation and inhomogeneities in the final parts. The present lecture will focus on two main phenomena that affect sintering components: anisotropic shrinkage and the distortion caused by gravity.

The first is a phenomenon well-known in the conventional press-and-sinter process of powder metallurgy. The attempt to understand the anisotropic shrinkage resulted in the development of a micromechanical model for the shrinkage, which describes the shrinkage rates along the different directions as functions of both structural and geometric activities of the samples.

In the study of the effect of gravity in inducing distortions, we focused on the sintering of parts produced by 3D printing. In this work, a numerical approach based on the continuum mechanics-based modeling of the gravity-induced distortion during sintering has been used to analyze and predict the deflection of supported 3D-printed beams allowing to define semi-analytical criterion, which can be used for design recommendations.

Bio: Dr. Elisa Torresani received her Ph.D. in Materials Science and Engineering from University of Trento (Italy) in 2016. In 2017, she started her postdoctoral research in the Department of Mechanical Engineering at San Diego State University, where she also taught a graduate level class on Mechanics of Sintering. Dr. Torresani’s research is focused on understanding the fundamentals of sintering and developing constitutive models of sintering which enable the prediction of the macroscopic and microscopic behavior of porous bodies (shape distortion, density distribution, grain growth, etc.). Her current research emphasizes the coupling of experimental and theoretical investigations for a better understanding of the chemical and physical phenomena that drive and influence sintering assisted additive manufacturing and field assisted sintering processes. She has authored 19 refereed journal publications and a patent. One of her papers recently published in Metallurgical and Materials Transactions A has been nominated for the Henry Marion Howe Medal of ASM International, awarded to the author of the paper of highest merit published in 2019. Her postdoctoral work on the liquid phase sintering in microgravity has been supported by NASA. She is affiliated with √¢¬Ä¬úSociety of Women Engineers√¢¬Ä¬ù, √¢¬Ä¬úThe American Ceramic Society√¢¬Ä¬ù, √¢¬Ä¬úThe Minerals, Metals, and Materials Society√¢¬Ä¬ù (TMS) and √¢¬Ä¬úAmerican Powder Metallurgy Institute√¢¬Ä¬ù.

HOST:

Parag Katira

VIDEO: