Blog posts
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Design of robust superhydraphobic surfaces, Dehui Wang, Zuankai Wang, Robin H.A. Ras, Xu Deng, et al., Nature, 2020
Superhydrophobic surfaces have promising applications in various medical and engineering applications; however, these surfaces, either via physical and/or chemical methods, suffer from one major flaw- extremely vulnerable to mechanical damage, so lose superhydrophobicity easily in practice.
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Impact-resistant nacre-like transparent materials, Yin, Hannard, Barthelat, Science, 2019
Novelty/impact/significance:
Propose and fabricate nacre-inspired glass panels (50x50x3) that possess large-scale tablet sliding toughening mechanism, is 2-3 times more impact resistant than conventional laminated and tempered glass, and maintains transparency, high strength/stiffness.
The method (laser engraving and lamination) produces large size with high order and periodicity, and is inexpensive and scalable.
Molecular Dynamics Simulation of a Polymer-Metal Interface in LAMMPS
We are currently investigating the impact resistance of multilayers using molecular dynamics. This project showed us that modeling material interfaces could be challenging even for someone with a background in atomic simulations. Therefore, we thought of sharing some useful information and the LAMMPS input files to model the aluminum-polyurethane interface (shown above). Please see here: https://github.com/nuwan-d/polymer_metal_interface
Can someone post an example of UMAT and VUMAT for the same elasto-plastic problem?
I want to understand how the stress update algorithm is modified for the different definitions of stress rate in ABAQUS/Standard and ABAQUS/Explicit formulations. I know the relationships, I just want to see how it's coded in a subroutine.
Also, the Hughes-Winget algorithm is used to update the stress defined by the Green-Naghdi stress rate by using the Jaumann rate. How to implement that in VUMAT? Can someone please post an example to clarify these aspects?
EML Webinar by Stephanie Lacour on July 8, 2020: From engineering elasticity to neural implants for translational research
EML Webinar on July 8, 2020 will be given by Prof. Stephanie Lacour at EPFL via Zoom meeting. Discussion leader: Professor Sigurd Wagner, Princeton University
Title: From engineering elasticity to neural implants for translational research
PhD or Postdoc: Depinning of dislocations in random media
The Department of Microsystems Engineering and the Department of Applied Mathematics at the University of Freiburg are calling for applications for
Two doctoral or postdoctoral researcher positions
How to include temperature effects on the shear rates in Dr. Huang's crystal plasticity code
I am using Dr. Huang's crystal plasticity code for an adiabatic process where temperature increase due to deformation need to be calculated. Dr. Huang's CP UMAT code does not consider the temperature effect of shear rate or hardening. Is there a way to include temperature effects in the current UMAT code?
http://www.columbia.edu/~jk2079/Kysar_Research_Laboratory/Single_Crysta…
Finite element simulation-based predictive regression modeling and optimum solution for grain size in machining of Ti6Al4V alloy: Influence of tool geometry and cutting conditions
For researchers and industrialists being active and/or interested in finite element modeling of machining operations and surface integrity:
Thermal wrinkling of liquid crystal polymer shell/core spheres
Smart soft materials that can flexibly respond to external multi-physics stimuli, have shown intriguing applications in shape-morphing and morphology control. Here, we present tunable wrinkling patterns in core-shell spheres under thermal load via controlling the orientation of director in nematic liquid crystal polymer (LCP). To analyze nonlinear instability and morphological evolution of LCP shell/core spheres, we develop a shallow core-shell model that accounts for director-induced anisotropic spontaneous strains.