viscoplasticity

Ponkrshnan Thiagarajan, Trisha Sain, Susanta Ghosh, "Bayesian calibration and uncertainty quantification of a rate-dependent cohesive zone model for polymer interfaces", Engineering Fracture Mechanics,

Volume 309, 2024, 110374, ISSN 0013-7944, https://doi.org/10.1016/j.engfracmech.2024.110374.

This paper describes the formulations for the viscoplasticity of metals based on the Chaboche and Delobelle model. The implementations of the viscoplastic models were detailed herein and then implemented via user subroutines for material models (UMAT) in ABAQUS. Two typical metals, i.e., 316 Stainless Steel and Zircaloy-4, were chosen as examples and their viscoplastic behaviors were captured. Numerical simulations are compared to reported experiments in order to validate the models and the UMAT codes.

Zheng Jia, Wing Kam Liu, Rate-dependent stress evolution in nanostructured Si anodes upon lithiation, Applied Physics Letters, 109, 163903 (2016) (DOI:http://dx.doi.org/10.1063/1.4964515)

Starting April 2016, we will have openings for two post-doctoral fellow positions in experimental and computational mechanics of advanced polymers. These positions will support a new research program between Singapore University of Technology and Design (SUTD) and National University of Singapore (NUS) funded by Agency for Science, Technology and Research (A*STAR). The project focuses on synthesizing, characterizing, modeling, and simulating the thermo-mechanical behavior of polymers with covalent adaptable networks (CANs), e.g. vitrimers.

Multiple Phd. positions are available in the area of computational solid mechanics with an emphasis on multiscale modeling of polymer nanocomposites, high strain rate characterization of novel nanocomposite materials,  in Mechanical Engg. Dept. in North Carolina A & T State University. Interested candidates are encouraged to communicate via email to tsain [at] ncat.edu and/or mannur [at] ncat.edu