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Sulin Zhang's picture

Journal Club Theme of March 2015: Mechanics of 2D Solid and Fluid Crystals

 

Sulin Zhang, Pennsylvania State University

Hongyan Yuan, University of Rhode Island

 

3D FEA of stress concentration

Dear all,

 

I am simulating tensile specimens with an elliptical pore(representing a flaw in the material) in the mid-cross section of the specimen. What I am looking for is the stress concentration caused by this pore.

I am simulating this as a 3D specimen under tensile loading only, with 3D, 8-node linear brick elements(1st order). Now my questions are:

1- Is there any analytical solution for such problems(3D with elliptical pore) with which I can compare my FEA results?

Xiaohan Zhang's picture

A single theory for some quasi-static, supersonic, atomic, and tectonic scale applications of dislocations

Xiaohan Zhang             Amit Acharya                Noel J. Walkington              Jacobo Bielak

We describe a model based in continuum mechanics that reduces the study of a significant class of problems of discrete dislocation dynamics to questions of the modern theory of continuum plasticity. As applications, we explore the questions of the existence of a Peierls stress in a continuum theory, dislocation annihilation, dislocation dissociation, finite-speed-of-propagation effects of elastic waves vis-a-vis dynamic dislocation fields, supersonic dislocation motion, and short-slip duration in rupture dynamics.

Tienchong Chang's picture

Nanodurotaxis: a fundamental law of nanoscale directional motion

Hi all,

One of our recent works on nanoscale directional motion induced by stiffness gradient.

I hope you will find it interesting.

http://dx.doi.org/10.1103/PhysRevLett.114.015504

This work has been presented in 2014 MRS Spring Meeting by Prof. Huajian Gao (the PPT file he used is attached): https://mrsspring14.zerista.com/event/member/109225

Best,

Tienchong

Creating a path in python for Abaqus

Dear all,

I want to write a python script for ABAQUS in which I can define a path for post-processing purposes. Getting the nodes which lie on the path is easy because they all lie on one edge, so with

myNodes=myEdge.getNodes()

I get the list of nodes.

 

Now the problem:

Amit Pandey's picture

Mechanical responses and deformation mechanisms of an AZ31 Mg alloy- Part 2

Recent paper is Part-2 of the paper mentioned below

 http://imechanica.org/node/10104 

http://www.sciencedirect.com/science/article/pii/S0749641910001142 

Mechanical responses and deformation mechanisms of an AZ31 Mg alloy sheet under dynamic and simple shear deformations

 

Abstract

MohammadSahlabadi's picture

J integral and Q parameter

Does anyone know how I can calculate J integral from descrete displacement field, stress and strain data which I estimated from experiment? 

Amit Pandey's picture

Additive manufacturing --> microstructure-->mechanical response

Tensile behavior of selective laser melted Ferritic Oxide Dispersion Strengthened Steel was evaluated for the first time and correlated to microstructures.

 

http://www.sciencedirect.com/science/article/pii/S1359645414009732

 

Abstract

how to apply cyclic loads in direct cyclic low cycle fatigue

Choose a channel featured in the header of iMechanica: 

hiii My dear CAE simulators....

plz help me m doing fatigue life estimation of plate with hole problem under constant amplitude tensile-compression

Chris Yakacki's picture

Update: Journal Club Entry July 2014: Overcoming Challenges in Liquid Crystalline Elastomers

Dear iMechanica,

Last July I posted a journal club entry on overcoming the traditional challenges in mechanically actuating liquid-crystalline elastomers (http://imechanica.org/node/16853). I'm glad to say we finally got our first manuscript regarding this work published in RSC Advances (DOI: 10.1039/C5RA01039J). 

Summit on Predictive Modeling of Ductile Failure

Place: AT&T Executive Education and Conference Center, University of Texas at Austin, Austin, TX

Dates: March 2-3, 2015

Abaqus tools

<p>Hi all</p>
<p>im modeling an laminated rubber isolator in abaqus and i have used mooney rivlin model.My model consists of three layers of rubber and steel plates in between.&nbsp; I dont know how to view the results for seperate parts of rubber and also how to adjust the contour plot valuees. kindly help me with it. thanks in advance.<a href="http://imechanica.org/comment/26854#comment-26854"><br /></a></p>

ageing viscoelastic

Hello everone

I am recently interested in viscoelastic composite materials with ageing effect. I will be very pleased if someone can advise me how to find a constitutive law with ageing effect. 

sincerely

 

IMECE 2015: Student Travel Awards and Best Paper Contest

Dear IMECE Attendees:

The Applied Mechanics Executive Committee (AMD-EC) is pleased to announce the 2015 IMECE student travel award and best paper competition.

On the modeling of asymmetric yield functions

In the context of metal plasticity, the yield function of a metal polycrystal is its most complex macro-characteristic. Letting aside the questions of kinematic or distortional hardening, the basic problem is geometric in nature: to design a family of convex surfaces capable of reproducing a wide range of experimental, or theoretically predicted data. While many satisfactory solutions have been proposed for the modeling of symmetric (with respect to the origin of the stress space) yield functions, the more general case of asymmetric functions has not witnessed comparable progress.

Fan Yang's picture

Is energy conservation satisfied in the current deformation application schemes in molecular dynamic simulations?

In our recent paper, we examined the energy conservation for the current schemes of applying active deformation in molecular dynamics (MD) simulations. Specifically, two methods are examined. One is scaling the dimension of the simulation box and the atom positions via an affine transformation, suitable for the periodic system. The other is moving the rigid walls that interact with the atoms in the system, suitable for the non-periodic system.

saimohan35's picture

How to extend crack in Mixed mode crack growth in Ansys ?

Hi, I am doing project on mixed mode crack growth of semi elliptical crack in gas turbine components under cyclic loading. Ansys has capability for finding J,K using CINT command. But, In mixed mode crack growth, i dont know how to deal with nodes and how to create random crack with new node coordinates obtained from previous steps. If you have any ansys code related to creating crack and finding fracture parameters like K, J (mode 1 or mixed mode), Can you please give me the code.

Thanks

(I cant use any other software, only Ansys)

saimohan35's picture

Can any one provide any apdl code to perform automatic fatigue crack growth ??

Hi, I am using Ansys Apdl for 3d fatigue crack growth. I need any one code to understand how it can be automized (recreating crack with node shift and remeshing).

 

Thank you

Gravity induced crease-to-wrinkle transition in soft materials

Creasing and wrinkling instability are two distinct surface instability modes characterized by localized singular folds and continuous smooth undulations, respectively. In this article, we show that the surface of a soft elastomer may develop wrinkles or creases under compression and the action of gravitational force, depending on the magnitude of gravitational force.

Dargazany's picture

Ph.D. Positions in Mechanics of Soft Materials at Michigan State University

Our Group of High Performance Materials in Enviormental & Civil Engineering Department at Michigan State University has an openings for PhD positions to work on Multiscale Modeling of Soft Materials starting sSummer  or Fall 2015.

shabber hussain's picture

Post buckling of stiffened composite panel

Dear all,

I am working on postbuckling of stiffened composite panels using ANSYS. I have done few experiments and trying to simulate in ANSYS. I have performed nonlinear analysis using arc length method and the load-axial displacement curve obtained is too stiff (having 60% higher slope) compared to the experimental curve. I think BCs, material properties and loading is fine in the model. Can anyone have any suggestions to improve my results? 

Mike Ciavarella's picture

some discussion and questions on Fineberg's beautiful experiments on dry friction

As many of you I am very intrigued by Fineberg's experiments on friction, published several times in Nature and Science (see ref. list below). I am trying to develop some (simple) models from a different perspective than what most people are trying to do (full dynamic simulations including all possible viscoelastic, rate-state dependence, etc.), main reason being that I think Coulomb law is still the basis for most engineering calculation.

Bisheswor's picture

load transfer in grephene laminates

Choose a channel featured in the header of iMechanica: 

Hi everyone,

                     First  little bit of background over my model.

My model is 3d,deformable solid extrude and consist of grephe flakes  each flakes depth is 0.33 nm and length we can input,We can input the total   box size in nm ...no of layers in that box...and the size of flakes...and the layers are generated automatically with no pattern.And Both side are supported with support.And one side is fixed and another is provided with displacement load.The element is 4 node linear terahedron.

target

Bisheswor's picture

Multiscale modelling of load transfer in grephene laminates

Hi everyone,

                     First  little bit of background over my model.

My model is 3d,deformable solid extrude and consist of grephe flakes  each flakes depth is 0.33 nm and length we can input,We can input the total   box size in nm ...no of layers in that box...and the size of flakes...and the layers are generated automatically with no pattern.And Both side are supported with support.And one side is fixed and another is provided with displacement load.The element is 4 node linear terahedron.

target

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