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zichen's picture

Residual Stresses and Poisson’s Effect Drive Shape Formation and Transition of Helical Structures

Strained multilayer structures are extensively investigated because of their applications in microelectromechanical/nano-elecromechanical systems. Here we employ a finite element method (FEM) to study the bending and twisting of multilayer structures subjected to misfit strains or residual stresses. This method is first validated by comparing the simulation results with analytic predictions for the bending radius of a bilayer strip with given misfit strains.

CutExtrude error Abaqus

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Hi all, 

I'm trying to create a full-scale truss for a static loading simulation using Abaqus.
I wanted to use a Python script to do this, but I am not very experienced with this language or the Abaqus methods.

The members forming the truss are cee sections. However, at the ends of the cee sections I want to create an extruded cut

Getting elastic constants using LAMMPS .

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Hello everyone , 

LAMMPS suggests a script to calculate C44 , C11 & C12 .The question is : How to calculate the others for a nanomaterial ? Thanks in advance ! 

zappalorto's picture

Summer School on Fatigue and Damage Mechanics of Composite Materials

Dear Colleagues,

we are glad to present the Summer School on Fatigue and Damage Mechanics of Composite Materials (13 . 17 July 2015) and the Short Course on Experimental Techniques and Testing of Composite Materials (9 . 10 July 2015) organized by and to be held at The Department of Management and Engineering  - University of Padova in Vicenza - Italy.

martin.levesque's picture

Post-doctoral position in Montréal on crystal plasticity in collaboration with the aerospace industry


I am looking for a 12-15 months post-doctoral fellow to work on crystal plasticity finite element simulation of impacts. This project is parts of a larger collaborative project with Pratt and Whitney, Bell Helicopter, L3 and Héroux Devtek aiming at understanding the effects of shot peening on fatigue life. The project involves 3 other post-doctoral fellows and 4 PhD students.

The starting date is flexible and could be as soon as now, depending on the candidates expertise.

The interested candidates are invited to send me their CV and publication lists.

sound propagation simulation in abaqus challenge

Dear friends,

           I am simulating sound propagation in mild steel.

frequency=5MHz mesh size=0.5mm

time incriment of wave amplitude=1e-9

instead of giving force at a node i have given boundry displacement



instead of showing sound propagation, my entire specimen(mild steel with 15 mm thickness) deflecting like a wave.I would like to know 1)what is the reason for that deflection?

2)what may be the possible solution?

Asymmetric flexural behavior from bamboo’s functionally graded hierarchical structure: Underlying mechanisms

As one of the most renewable resources on Earth, bamboo has recently attracted increasing interest for its promising applications in sustainable structural purposes. Its superior mechanical properties arising from the unique functionally-graded (FG) hierarchical structure also make bamboo an excellent candidate for bio-mimicking purposes in advanced material design. However, despite its well-documented, impressive mechanical characteristics, the intriguing asymmetry in flexural behavior of bamboo, alongside its underlying mechanisms, has not yet been fully understood.

A micromechanical analysis of the fracture properties of saturated porous media

A two-dimensional single edge crack problem is employed to investigate the fracture behavior of saturated poroelastic media. The media are mimicked by a micromechanical model consisting of elastic matrix and square arrays of voids with prescribed uniform pore pressure. Finite element method is used to simulate the fracture responses of the model subject to remote stress and pore pressure loading. The stress extrapolation method is extended for the porous media to calculate the nominal stress intensity factor (SIF) from the crack tip stress field.

Development of a Biofidelic Human Head Model from MRI data

NRL-Simpleware head model


Traumatic brain injuries from head impact are a major issue across areas such as defence, automotive and sports, and can be costly to research using experimental testing. These injuries can be explored, though, through 3D models created from scan data and computer simulations.

ashutosh.agrawal's picture

Instability-driven vesicle growth in biological cells

Journal: PNAS, published ahead of print, March 9 2015, doi:10.1073/pnas.1418491112

Title: Endocytic proteins drive vesicle growth via instability in high membrane tension environment

Authors: Nikhil Walani, Jennifer Torres, and Ashutosh Agrawal 

simulation of large rotations by laminated theory?

Hello iMechanica,


I am wondering if it is possible to perform the non-linear analyses (including large rotations) by laminated theories such as First order Shear Deformation Theory (FSDT) or higher orders and so on. Normally, those theories are valid for moderate rotations but: does anybody know if there is any modification to extend it for large rotations?

Thanks in advance for any advice!




Mesh Update in ANSYS Workbench After Simulation

Hello Everyone, 
I am using ANSYS Workbench (Static Structural). I need to update the coordinates of the nodes, after each simulation.The new coordinate conditionally depends on the stress tensor value of the previous simulation. If anyone have idea how can I solve this problem please help me out....


Ivan Tsukanov's picture

New Parametric Analytical Solutions in Plane Elastic Contact of Complex-Shaped Smooth Curvilinear and Wavy Surfaces

Dear colleagues!

I'm a new user of iMechanica. My research fields are contact mechanics and tribology. I would be very thankful for discussion of my first preprint as i want to publish it in scientific journal.




_canhuiyang's picture

Ionic Cable

This paper demonstrates a new type of interconnects to fulfill the primary function of axons: transmitting electrical signals over long distances and at high speeds. The interconnect, which we call "ionic cable", uses ions to transmit signals, and is built entirely with soft, elastic materials-elastomers and gels. The ionic cable is highly transparent, and remains functioning after being stretched nearly eight times its original length. We describe the design, theory and experiment of the ionic cable.

ABAQUS and Sizes!!!1

Hi everybody,

I want to model a biological cell, diameter of 10 microns! Then what should be the apporx. size in CAE? I am confused! I got to know that the minimum size of parts should be in mm, is this right. then how to solve the problem.

Thanks in advance


Mike Ciavarella's picture

rate-state dependent friction in ANSYS

Dear collegues

a quick question:- I am playing with continuum models of Contact (Hertz, Westergaard and so on) and friction laws. However, I prefer for my students to use ANSYS FEM code. In Ansys there is standard Coulomb, rate-dependence but not rate-state (unless one codes some user subroutines). See

Enforcing tie constraint

Dear iMechanica users,


I have a problem which I would appreciate any input on how to solve. I have an indentation problem, in which I indent a cell with an enclosing membrane. Therefore, I create contact between the (rigid) indenter and membrane, and tie the membrane and intracellular solid elements together. The model is an axisymmetric model, with CAX3 and CAX4R making up the intracellular axisymmetric solid elements and SAX1 the axisymmetric membrane.

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?

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


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.

This work has been presented in 2014 MRS Spring Meeting by Prof. Huajian Gao (the PPT file he used is attached):



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


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 

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




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