2021-04-07 08:00:00
An analysis of the initiation and growth of voids in the Li electrode during the stripping phase of an Li-ion cell with a solid electrolyte is presented. We first show that standard Butler-Volmer kinetics fails to predict the observed void formation. This motivated us…
Inclusion of the nonlinear response and fracture of the human skull bone in finite element (FE) simulations aimed at evaluating head injury due to externally applied loading will increase the biofidelity of these simulations and provide a means of identifying fracture-based injury. A challenge…
We have significantly extended a previous dislocation-density based constitutive theory to enable modeling the strong influence of temperature and strain rate on the thermomechanical behavior of single crystal body centered cubic (BCC) tantalum. The extension includes an expression of saturation dislocation density as a…
Lightweight magnesium (Mg) alloy sheets have attracted considerable attention for potential applications in transportation vehicles. However, their poor formability at room temperature (RT) hinders the wider applications. This work presents an advantage of precipitation-hardenable wrought Mg alloys in simultaneously achieving excellent RT formability and…
Blast-induced traumatic brain injury (bTBI) is a significant health concern in the era of asymmetric warfare. Several mechanisms of bTBI have been proposed in the literature: direct intracranial transmission, skull flexure, thoracic mechanism, cavitation, and head acceleration. The present understanding of bTBI mechanisms and…
As transition into an era of data generation and collection, empirical summaries in the classical constitutive model of granular material are less able to take full advantage of the increasingly larger data sets. In this work, the deep learning (DL) method enabled mappings between…
This talk will present a machine learning framework that builds interpretable macroscopic surrogate elasto-plasticity models inferred from sub-scale direction numerical simulations (DNS) or experiments with limited data. To circumvent the lack of interpretability of the classical black-box neural network, we introduce a higher-order supervised…
Sucrose is a commonly used energetic material simulant for 𝛽-HMX. However, its behavior under extreme loading conditions is not understood well. Pressure-Shear Plate Impact (PSPI) experiments have been conducted to provide an experimental foundation for developing a suitable constitutive model for sucrose. Experiments have…
Newly developed reactive interatomic potential (ReaxFF) for the Mg/Al/Si/O is applied to operate a series of tensile molecular dynamics (MD) simulations for S-glass. Total 18 number of stress-strain simulations used strain rate from 1e7/s to 5e15/s to all-atom S-glass model. Both strength and modulus…
In woven composite material, microscopic damage phenomena including fiber-matrix interface debonding, fiber breakage, and matrix fracture will subsequently result in macroscopic failure behaviors. Conventional detailed micromechanical models for predicting the effective composite material property are limited to microscale due to high computational cost. Continuum…
