Dear colleagues,

The USACM is happy to announce a virtual seminar this week on Thursday, July 9th at 3pm Eastern.  The title of the seminar is "Image- and Experiment-based Modeling of the Forgotten Right Side: Right Ventricle, Tricuspid Valve, and Venous Blood Clot".  An abstract of the talk is available here:

https://unsacm.memberclicks.net/assets/docs/Rausch_2020.07.09_2pm.pdf

We have a number of seats available to anyone interested.  We just ask attendees to register at this page:

Dear friends and colleagues,

We invite you to submit a presentation only abstract to Symposium on Multifunctional Intelligent Materials and Systems. This symposium is part of 2020 ASME International Mechanical Engineering Congress & Exposition, November 15-19, 2020 Oregon Convention Center, Portland, OR.

Hydrogel ionotronics, Canhui Yang and Zhigang Suo, Nature Reviews Materials, 2018

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.

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.

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

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 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

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.