Sibley School Seminar Series: Vikas Srivastava - Coupled continuum models spanning amorphous polymers to metastable steels

Description

Coupled continuum models spanning amorphous polymers to metastable steels 

Vikas Srivastava, Howard M. Reisman ’76, P’09 Assistant Professor of Engineering, Brown University

Abstract

In this talk, I will describe our recent research on coupled continuum scale constitutive models that span amorphous polymers, engineered tissues, and metastable steels. I will discuss our elastic viscoplastic model for glassy to rubbery/viscous fluid-like phase transformation and predictions of polycarbonate response from moderate to extremely high strain rates (10^⁵/second), mimicking moderate impact to shock wave conditions. I will also briefly discuss our recent continuum homogenized model for highly anisotropic collagen fiber-matrix engineered heart tissues. Next, I will describe our work on metastable steels. At cold temperatures, steels such as 316L stainless steel show coupled temperature and plastic strain driven transformation from FCC austenite to BCC martensite. The mechanical properties of such metastable austenitic steels make them desirable for a wide range of applications ranging from automobiles to liquefied natural gas (LNG) transportation. I will present our thermo-mechanical model for phase transitioning austenitic steels for room to cryogenic temperatures. Finally, our recent research applying machine learning with finite element simulations to accurately measure critical characteristics of embedded non-visible flaws in steel structures will be discussed. Experimental validations of all modeling and computational work will be discussed. 

Bio

Dr. Srivastava is currently the Howard M. Reisman Assistant Professor of Engineering at Brown University. Dr. Srivastava received his Ph.D. in Mechanical Engineering from M.I.T. in 2010. Following his Ph.D., Dr. Srivastava worked at ExxonMobil Upstream Research and Corporate Strategic Research organizations in various roles including Senior Technical Professional Advisor – Mechanics of Materials, Mechanics Team Lead, Marine Team Lead, Fitness for Service Research Area Lead, and Worldwide Deepwater Drilling Coordinator. He also served as an Advisory Board Member for the Deepstar industry consortium on high pressure, high-temperature subsea systems. Dr. Srivastava joined Brown University in the fall of 2018. Professor Srivastava’s research focus is in the development of continuum scale solid mechanics models and methods for engineering structures and biomedical applications. 

Open to the Engineering Community