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Fan Xu's picture

A consistent finite-strain plate model for wrinkling of stretched anisotropic hyperelastic films

Stretch-induced wrinkles usually occur in a thin, clamped-clamped, hyperelastic film and eventually disappear upon excess stretching, with wrinkling direction being perpendicular to the stretching direction within isotropic elasticity framework. Here, we consider in-plane anisotropy induced by infilling fibers in thin films, which significantly affects the orientation and amplitude of wrinkles.

Ajeet Kumar's picture

Improved formulas of extensional and bending stiffnesses of rectangular nanorods

Improved formulas of extensional and bending stiffnesses of isotropic rectangular nanorods are derived. These formulas reduce to the existing widely used formulas for a special choice of material parameters, i.e., when the surface Poisson's ratio and the bulk Poisson's ratio match thus highlighting the limitation of the existing formulas.

oliver oreilly's picture

Post-Touchdown Dynamics of an Electrostatically Actuated MEMS Device

Dear Colleague

Our (open access) paper on the post-touchdown dynamics of an electrostatically actuated MEMS device has just appeared in IJSS:

Nate N. Goldberg and Oliver M. O'Reilly, Electrostatically actuated MEMS in the post-touchdown regime: The thin-dielectric limit and a novel reduced-order model for release dynamics"

Graphical Abstract can be found here

Kshiteej Deshmukh's picture

Multiband homogenization of metamaterials in real-space: Higher-order nonlocal models and scattering at external surfaces

Dear colleagues, 

We invite you to read our recent article, which proposes a multiband homogenization scheme and has been accepted to appear in JMPS (

Multiband homogenization of metamaterials in real-space: Higher-order nonlocal models and scattering at external surfaces

Wenbin Yu's picture

Poster Competition for NSF-funded Research and REU

For students who are attending IMECE this year, there is a wonderful opportunity for you to apply for a travel award ($1000/grad, $500/under). There are a total of 50 travel awards for you to claim. You also have a possibility to win cash awards ($2000 total). You need to submit a poster abstract by 6/29. See for more details. 

vacary's picture

Benchmarks for computation contact Mechanics. A collection of problems.

Dear colleagues,

I would like to draw your attention to a recent work we have been doing to set up a library of examples of discrete one-sided contact problems with Coulomb friction. 

The collection of problems can be found here  and the C API for writing and listing these files here:

arash_yavari's picture

Universality in Anisotropic Linear Anelasticity

In linear elasticity, universal displacements for a given symmetry class are those displacements that can be maintained by only applying boundary tractions (no body forces) and for arbitrary elastic constants in the symmetry class. In a previous work, we showed that  the larger the symmetry group, the larger the space of universal displacements. Here, we generalize these ideas to the case of anelasticity. In linear anelasticity, the total strain is additively decomposed into elastic strain and anelastic strain, often referred to as an eigenstrain.

Best metamaterial design method in the world

      Jiang Ke. Orthotropic metamaterials with freely tailorable elastic constants. Preprint at (2022).  

      It has great application value in the fields of mechanical metamaterials, elastic wave metamaterials, acoustic metamaterials, and seismic metamaterials, and has opened up a broad road for realizing the dream of controlling elastic waves, acoustic waves and vibrations.

Joshua's picture

Direct 4D printing for double-curvature and multimodal morphing

Most 4D printings utilize 1D structural deformation — bending and coiling to morph a flat shape by controlling only a single curvature, limiting the realization of complex 3D curved surfaces with two curvatures. We quantitatively analyze the morphing of a 2D plate into doubly curved surfaces on a direct 4D printing of a single isotropic material employing anisotropy of shape memory effect during the extrusion-based printing.

M. Jahanshahi's picture

A compatible mixed finite element method for large deformation analysis of solids in spatial configuration

In this work, a new mixed finite element formulation is presented for the analysis of two-dimensional compressible solids in finite strain regime. A three-field Hu-Washizu functional, with displacement, displacement gradient and stress tensor considered as independent fields, is utilized to develop the formulation in spatial configuration. Certain constraints are imposed on displacement gradient and stress tensor so that they satisfy the required continuity conditions across the boundary of elements.

arash_yavari's picture

The Universal Program of Nonlinear Hyperelasticity

For a given class of materials, universal deformations are those that can be maintained in the absence of body forces by applying only boundary tractions.  Universal deformations play a crucial role in nonlinear elasticity. To date, their classification has been accomplished for homogeneous isotropic solids following Ericksen's seminal work, and  homogeneous anisotropic solids and inhomogeneous isotropic solids in our recent works. In this paper we study universal deformations for inhomogeneous anisotropic solids defined as materials whose energy function depends on position.

Jinxiong Zhou's picture

Multiscale modeling of viscoelastic behavior of unidirectional composite laminates and deployable structures

Due to the inherent viscoelasticity of constituent matrix and the possibility of long-term storage, space deployable structures made of composites are likely to exhibit relaxation in the stored strain energy, which may degrade their deployment performance. This paper presents a bottom-up finite element based multiscale computational strategy that bridges the experimentally measurable properties of constituent fibers and matrix to numerical predictions of viscoelastic behavior of composite laminates and general shell structures.

Shashank Pathrudkar's picture

Machine learning based prediction of the electronic structure of quasi-one-dimensional materials under strain

I am happy to share our recent work, that has been published in the Physical Review B journal. I would be happy to share the paper with anyone interested, let me know if you cannot access the paper otherwise.

Figure 2 

Zhaohe Dai's picture

Droplets on lubricated surfaces: The slow dynamics of skirt formation

Dear iMechanicians,

I would like to share our recent work published in Phys. Rev. Fluids on the statics and dynamics of droplets on lubricated surfaces: 

Droplets on lubricated surfaces: The slow dynamics of skirt formation

Zhaohe Dai and Dominic Vella

Parag Tandaiya's picture

Size effects and failure regimes in notched micro-cantilever beam fracture

Notched micro-cantilever beam fracture (MCF) experiments are increasingly being used to measure fracture toughness of materials at the micro-scale and draw conclusions about size-effects in them. In our recent paper published in Acta Materialia, 'Size effects and failure regimes in notched micro-cantilever beam fracture', we elucidate the failure regimes in MCF experiments and discuss the conditions for validity of MCF tests.

yuzhen's picture

Formation of rolls from liquid crystal elastomer bistrips

By Yuzhen Chen, Alexa S. Kuenstler, Ryan C. Hayward*, Lihua Jin*

Planar equilibria of an elastic rod wrapped around a circular capstan

We present a study on planar equilibria of a terminally loaded elastic rod wrapped around a rigid circular capstan. Both frictionless and frictional contact between the rod and the capstan are considered. We identify three cases of frictionless contact -- namely where the rod touches the capstan at one point, along a continuous arc, and at two points. We show that, in contrast to a fully flexible filament, an elastic rod of finite length wrapped around a capstan does not require friction to support unequal loads at its two ends.


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