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Erkan Oterkus's picture

Mini-symposium on Peridynamics and Nonlocal Models at USNCCM13

Dear Colleagues:

As part of the USNCCM13, we are organizing a mini-symposium on “Peridynamics and its applications”.

Anisotropic stiffness of isotropic material

Dear colleagues,

 

Consider a simple non-linear elastic material with stress given as

σ = D(εdev) εdev + B εiso

where εdev is the norm of εdev, D is a function of εdev and B is constant. The material is isotropic since the principal directions of  σ and ε will coincide.

If we differentiate σ wrt ε to obtain the material stiffness the form of the stiffness tensor will be

virginierollin85's picture

Faculty position in Aerospace Engineering at the Associate or higher level - Embry-Riddle Aeronautical University

The department of Aerospace Engineering at Embry-Riddle Aeronautical University is currently looking to fill a position at the Associate or higher level in the area of structures. The candidate should have an exemplary record of teaching and scholarly activities including externally funded research. The candidate should be able to teach our structures and fracture mechanics classes at the undergraduate and graduate levels.

Cai Shengqiang's picture

Diffusion-induced wrinkling instability in a circular poroelastic plate

A poroelastic material can imbibe solvent and swell. When the material swells inhomogeneously or

swells under external constraints, stresses can develop inside the material. The stresses can trigger

mechanical instabilities in the material or even break the material, which have been often observed

in experiments. In this paper, we study the wrinkling instability of a circular poroelastic plate, in

the process of solvent molecules migrating into the plate from the edge. The critical conditions for

Cai Shengqiang's picture

wet adhesion between two soft layers

Two solids can adhere to each other in the presence of a liquid bridge between them, which is called wet adhesion. When the solid is soft, the liquid bridge can cause deformation in the material, and in turn, the deformation may have dramatic effects on the wet adhesion. To investigate the effect, in this article, we calculate the deformation in two soft layers with different separations and connected by a liquid bridge. We illustrate the effect of deformation in the soft layers on the adhesive force.

Cai Shengqiang's picture

Drying-induced cavitation in a constrained hydrogel

Cavitation can be often observed in soft materials. Most previous studies were focused on cavitation in an elastomer, which is under different mechanical loadings. In this paper, we investigate cavitation in a constrained hydrogel induced by drying. With taking account of surface tension and chemo-mechanics of gels, we calculate the free energy of the system as a function of cavity size. The free energy landscape shows double-well structure, analogous to first-order phase transition.  Above the critical humidity, a cavity inside the gel is tiny.

Bo Li's picture

Modeling of dielectric elastomer as electromechanical resonator

Dielectric elastomers (DEs) feature nonlinear dynamics resulting from an electromechanical coupling.

Under alternating voltage, the DE resonates with tunable performances. We present an

analysis of the nonlinear dynamics of a DE as electromechanical resonator (DEER) configured as a

pure shear actuator. A theoretical model is developed to characterize the complex performance

under different boundary conditions. Physical mechanisms are presented and discussed. Chaotic

State of stress in a Uniaxial Tensile Test

Hello Mechanicians,

I have a doubt regarding Uniaxial Tensile Test which has bugged me for quite some time. It may be a trivial one, but it goes like this:

ASME 2015 Applied Mechanics and Materials Conference, McMAT2015

Symposium 12, Modeling of Vascular Tissues

June 29 – July 1, 2015

Location: Seattle, Washington at the Motif Hotel near Seattle Downtown Waterfront

Abstract Deadline EXTENDED: February 23, 2015

Description

yann.charles's picture

PostDoctoral Position - Itodys, Univ. Paris Diderot, France

no longer available.

--

A postdoctoral position in france is openened on DFT calculations to get the influence of hydrogen on grains boudaries failure in Al polycristals. This work is a between LSPM and ITODYS labs.

Please find the position attached.

 

Contact:

Kun Zhou's picture

Postdoctoral research positions at Nanyang Technological University, Singapore

We are looking for a few postdoctoral researchers to work on the following topics at Nanyang Technological University, Singapore.  

1. First-principles calculation/molecular dynamics simulation of two-dimensional materials for energy and environmental applications.  

2. Numerical modeling of fracture and fatigue behaviors of metallic/polymeric materials.

Sulin Zhang's picture

Ripplocations = surface ripples + dislocations ?

Dislocations are topological line defects in three-dimensional crystals. Same-sign dislocations repel according to Frank s rule . This rule is broken for dislocations in van der Waals (vdW) layers, which possess crystallographic Burgers vector as ordinary dislocations but feature surface ripples”  due to the ease of bending and weak vdW adhesion of the atomic layers.

Yannis Korkolis's picture

McMAT 2015 symposium on materials and manufacturing

We would like to invite your contribution to Symposium #18: “Experiments and Constitutive Modelling of Materials in Advanced Forming Processes” in the upcoming ASME 2015 Applied Mechanics and Materials Conference, McMAT2015, to be held in Seattle on June 29-July 1, 2015.

Ph.D. Position in Computational Biomechanics at Villanova University

A Ph.D. position is available with a start date of Summer 2015 or Fall 2015 at the Computational Biomechanics and Solid Mechanics Laboratory at Villanova University.

The research project is an NSF funded project focusing on multiscale modeling of bone fracture. Candidates with a strong background and interest in biomechanics, solid mechanics, and computational modeling are encouraged to apply.

Ph.D. Position in Computational Biomechanics at Villanova University

 A Ph.D. position is available with a start date of Summer 2015 or Fall 2015 at the Computational Biomechanics and Solid Mechanics Laboratory at Villanova University.

The research project is an NSF funded project focusing on multiscale modeling of bone fracture. Candidates with a strong background and interest in biomechanics, solid mechanics, and computational modeling are encouraged to apply.

Yonggang Huang's picture

Professor Xuanhe Zhao will receive the Journal of Applied Mechanics Award in 2015

Prof. Xuanhe Zhao from MIT will receive the 2015 Journal of Applied Mechanics Award for his paper "Phase diagrams of instabilities in compressed film-substrate systems " (Journal of Applied Mechanics, v 81, article 051003, 2013).  

Cohesive debonding using traction separation law

Hi Everyone,

 

I am trying to model peeling of polymeric film over metal substrate. I am uisng a zero thickness cohesive element layer between the film and substrate. In abaqus the quads mode is what I use and mode independent. I have a maximum displacement of 0.0001 m for damage evolution. I also have nominal stress normal only mode as 100 and Normal stress first direction as 50. 

Call for Abstracts-ASME McMAT 2015: Symposium 10: Fundamental Biomechanics and Biomaterials Invention for Translational Medicine

Dear Colleagues, 

We are inviting you to submit abstracts on ASME McMAT 2015: Symposium 10:

Fundamental Biomechanics and Biomaterials Invention for Translational Medicine.

 

Fabrice Pierron's picture

3 year post-doctoral position available - High rate testing of materials

As part of my EPSRC Fellowship programme, I am now recruiting the second post-doctoral fellow associated with the project. I am looking for a talented young researcher with skills in experimental mechanics, particularly in the field of high rate testing of materials and high speed imaging for full-field deformation measurements. Informal enquiries can be made directly to me at f.pierron@soton.ac.uk, attaching a CV.

Overestimated peak strength for cube compression. Abaqus/Explicit

Hi,

I have done compression test for concrete cube using Concrete damaged plasticity model. I assigned BC in Reference point which I coupled with a surf of the cube.

I have got stress-strain curve that looks nice, but Peak strength is 2-3 times higher than it should be.

Ia have uploaded pic of force-displacement.

Can anybody help me?

Thanks

ABAQUS: Thermal stresses in a rectangular composite plate

Trying to model a crossply square plate with a sinusoidal temperature loading (uniform along the thickness). I am trying to match the results by Kant et al 2008 and Rohwer et al 2001. I am modeling the compoosite as a 3-D solid elements (making a part and dividing into 4 layers). I always obtain transverse shear stress on the 90 degree layer at 0,b/2,z to be zero.  My results match with that of the paper when I have a single layer of orthotropic material but they dont match when I have 4 layers of equal thickness and an aspect ratio of 5 (length/thickness).

 

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