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thin film

Fan Xu's picture

Mechanics of tension-induced film wrinkling and restabilization: a review

Wrinkling of thin films under tension is omnipresent in nature and modern industry, a phenomenon which has aroused considerable attention during the past two decades because of its intricate nonlinear behaviors and intriguing morphology changes.

Fan Xu's picture

Competition between Mullins and curvature effects in the wrinkling of stretched soft shells

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.

Zhaohe Dai's picture

Elastocapillary cleaning of twisted bilayer graphene interfaces

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

Fig. 1

Fan Xu's picture

Mathematically exploring wrinkle evolution

Wrinkling is one of the most important mechanical deformation modes (for example, buckling and crumpling) that are omnipresent in our daily life: for instance, wrinkled fingers after soaking in water for a prolonged time, the folds within the brain, and metal wrinkles after a car collision, to name a few.

wangyouhua10's picture

Is there any optimal way for a membrane conformal with a given surface

Good day, all!

Currently, I'm interested in the conformability of a membrane with a given surface.

Matt Pharr's picture

In-situ measurements of stress evolution in composite sulfur cathodes

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.

New PhD position at Eindhoven University of Technology - Micro-mechanics of ultra-thin free-standing multi-layer membranes in MEMS ultrasound transducers

Dear colleagues,

a new PhD position has become available at the Mechanics of Materials group, Eindhoven University of Technology, The Netherlands (

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

Siva P V Nadimpalli's picture

Time-dependent deformation behavior of polyvinylidene fluoride binder: Implications on the mechanics of composite electrodes

Time-dependent deformation behavior of polyvinylidene fluoride binder: Implications on the mechanics of composite electrodes (

Arnuparp Santimetaneedol, Rajasekhar Tripuraneni, Shawn A. Chester, Siva P.V. Nadimpalli 

Douglas P Holmes's picture

Geometry and mechanics of thin growing bilayers

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


How to analysis Fatigue of shaft using Ansys or Ncode designlife?

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I use ANSYS APDL with code for my shaft with two coating layers(interlayer and coating layer). I already analysis stress of shaft with Ansys. the result is ok and i exported to .RST file. But , when i input my shaft to Ncode, I can't find the interlayer and coating layers.I think this shaft have 3 part(subtrate, interlayer, coating layer)
!substrate materials

Young's modulus (Mpa): 2.1e5
Poisson's ratios:0.3

! interlayer material

zichen's picture

Mechanical Self-Assembly of a Strain-Engineered Flexible Layer: Wrinkling, Rolling, and Twisting

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.

Shutao Qiao's picture

Conformability of a Thin Elastic Membrane Laminated on a Rigid Substrate With Corrugated Surface

When laminating a thin elastic membrane on a substrate with surface roughness, three scenarios can happen: 1) fully conformed, i.e., the membrane completely follows the surface morphology of the substrate without any interfacial gap; 2) partially conformed; and 3) nonconformed, i.e., the membrane remains flat if gravity is not concerned.

danial_faghihi's picture

IMECE 2015 Symposium: Modeling and experimental characterization for the behavior of the micro/nanostructured thin films

 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.


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

Probing the intermediate states between rolling-up and wrinkling thin films

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.

Piezoelectricity above the Curie temperature? Combining flexoelectricity and functional grading to enable high-temperature elect

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.

danial_faghihi's picture

Symposium in IMECE 2014, Montreal, Canada

Dear Colleagues,
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 2014 International Mechanical Engineering Congress and Exposition in Montreal, Canada (

Experiments in anti-plane deformation of thin films

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,



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