thin film

Dear iMechanicians,

I want to share our recent work published in Nano Letters on the blister test of nanoflakes. The title, abstract, and links for data are as follows:

Pull-to-Peel of Two-Dimensional Materials for the Simultaneous Determination of Elasticity and Adhesion 

Zheng Fang, Zhaohe Dai*, Bingjie Wang, Zhongzheng Tian, Chuanli Yu, Qing Chen, and Xianlong Wei*

Job description for Internship as a Flexible Display Technologist

Job Summary: 

In this position, you will play a critical role in developing and assessing new display technologies in for possible use in Apple products, crafting new designs and intellectual property for Apple, and interacting with multiple partners across the company and with technology and product suppliers to Apple. 

Key Qualifications: 

— Thorough knowledge of Solid Mechanics, Failure Mechanics, and Strength of Materials 

A highly stretched hyperelastic shell exhibits a coupling behavior of local wrinkling and global bending within the stability boundary, and curvature resists and can even suppress surface wrinkles beyond a critical threshold. Here, we report a novel phenomenon that smooth surface maintains upon stretching a soft shell, while wrinkles emerge upon unloading, which implies a nonlinear interplay between curvature and Mullins (stress softening and residual strain) effects in the entire loading-unloading cycle.

Dear iMechanicians, I would like to share our recent work on a drop confined by two adhesive graphene sheets (as illustrated below). 

Owing to their enormous capacities, Li-S batteries have emerged as a prime candidate for economic and sustainable energy storage. Still, potential mechanics-based issues exist that must be addressed: lithiation of sulfur produces an enormous volume expansion (~80%). In other high capacity electrodes, large expansions generate considerable stresses that can lead to mechanical damage and capacity fading.

Teng Zhang

Department of Mechanical and Aerospace Engineering, Syracuse University

Introduction

Dear colleagues,

a new PhD position has become available at the Mechanics of Materials group, Eindhoven University of Technology, The Netherlands (http://mate.tue.nl/mate/)

Micro-mechanics of ultra-thin free-standing multi-layer membranes in MEMS ultra-sound transducers.

Matteo Pezzulla, Gabriel P. Smith, Paola Nardinocchi, and Douglas P. Holmes, Soft Matter, 12, 4435-4442, (2016).

Conformability of a Thin Elastic Membrane Laminated on a Soft Substrate With Slightly Wavy Surface

Liu Wang, Nanshu Lu*

Self-shaping of curved structures, especially those involving flexible thin layers, is attracting increasing attention because of their broad potential applications in, e.g., nanoelectromechanical andmicroelectromechanical systems, sensors, artificial skins, stretchable electronics, robotics, and drug delivery.

Novelis is hiring for a Principal Scientist in Atlanta, GA. 

 We would like to invite you to participate in a symposium on “Modeling and experimental characterization for the behavior of the micro/nanostructured thin films” in ASME 2015 International Mechanical Engineering Congress & Exposition
November 13 – 19, 2015 
Houston, Texas. The deadline for abstract submission is March 2, 2015.

Organizers:

Danial Faghihi, Institute for Computational Engineering & Sciences,UT Austin

F. Xu, M. Potier-Ferry, S. Belouettar, H. Hu

International Journal of Non-Linear Mechanics (2014), http://dx.doi.org/10.1016/j.ijnonlinmec.2014.12.006

Abstract:

Self-positioned nanomembranes such as rolled-up tubes and wrinkled thin films have been potential systems for a variety of applications and basic studies on elastic properties of nanometer-thick systems. Although there is a clear driving force towards elastic energy minimization in each system, the exploration of intermediate states where specific characteristics could be chosen by a slight modification of a processing parameter had not been experimentally realized.

Xu, F., Potier-Ferry, M., Belouettar, S., Cong, Y.,

International Journal of Solids and Structures (2014), doi: http://dx.doi.org/10.1016/j.ijsolstr.2014.06.023

Abstract:

Most technologically relevant ferroelectrics typically lose piezoelectricity above the Curie temperature. This limits their use to relatively low temperatures. In this Letter, exploiting a combination of flexoelectricity and simple functional grading, we propose a strategy for high-temperature electromechanical coupling in a standard thin film configuration.

Dear all,

I was curious whether there are any
experimental information and / or results regarding the out of plane (anti-plane)
deformation of (very) thin films. For example an elastic thin film subjected to anti-plane loading on its surface. Any other suggestions regarding possible applications of anti-plane loading conditions in thin films would be appreciated. 

Thanks a lot,

Thanasis