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mazen diab's picture

Journal Club Theme of February 2015: The Ruga Mechanics

The Ruga Mechanics

Prepared by Mazen Diab, Ruike Zhao and Kyung-Suk Kim

Brown University, Providence, RI


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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.

Yong Zhu's picture

IMECE 2015 Symposium on “Mechanics of Adhesion and Friction”

Dear Colleagues,

We would like to invite you to submit an abstract to the symposium on Mechanics of Adhesion and Friction (Track 12, Topic 3), ASME-IMECE 2015, Houston, TX, Nov. 13-19, 2005. The submission deadline is March 2, 2015. Confirmed invited speakers this year include Yonggang Huang (Northwestern University), Shu Yang (UPenn) and Kevin Turner (UPenn). 


vicky.nguyen's picture

Submit abstract to Mechanics and Materials for Biology and Medicine, IMECE 2015 - Deadline March 2, 2015

We would like to invite you to submit an abstract to:


Mechanics and Materials for Biology and Medicine

IMECE 2015.  

November 13-19, 2015 

Houston, TX, USA


Siva P V Nadimpalli's picture

Abstract deadline for IMECE symposium on Mechanics of Deformation and Failure of Energy Materials is March 2, 2015

Dear Colleagues,

Just a gentle reminder that the deadline for abstract submission is March 2, 2015. Please consider submitting an abstract to the symposium titled “Mechanics of Deformation and Failure of Energy Materials” at the IMECE 2015, Houston, Texas, November 13-19, 2015. 

Post-Doctoral Research Associate

Research Associate in Experimental Biomechanics
Newcastle University - School of Mechanical & Systems Engineering
Location: Newcastle Upon Tyne
Salary: £28,695 to £30,434
Closes: 25th March 2015
Job Ref: D1704R (MSE)

Helps needed for Mixing of granular media in a drum mixer

Hi everyone,

I just realized there is a DEM feature built in ABAQUS. A drum mixer example is given in user manual. but i still cannot figure out how to do it like how to creating a number of discrete elements, defining their locations, and so on. 
Could anyone offer me any tips, or any tutorials which can be hardly found online

Thanks in advance.

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.


Postdoctoral Fellow at the University of Pittsburgh

Applications are invited for a 2 year Postdoctoral Fellow in Dr. Andrew Bunger's group at the University of Pittsburgh Department of Civil and Environmental Engineering. The group conducts research in geomechanics with an emphasis on mechanics of hydraulic fractures and poromechanics of rocks.

Technical Discussion

Good aftrnoon to all,

i am new to ansys apdl,so kindly help me with this problem.

i am running linera static analysis for landing skid skid of helicopter but on solving i m getting error like a small negative equation solver pivot term has been encountered at UX degree of freedom.

what is the meaning of this error & how to tackle this?



Sushant Zutshi


The Department of Aerospace Engineering at the Indian Institute of Technology, Madras is seeking to fill Assistant Professor vacancies in the following research areas.

1) Experimental Structural Mechanics/ Composites
2) Aircraft Aerodynamics (experimentalists preferred)
3) Control and Flight Mechanics of Aerospace vehicles
4) Aircraft Design (aerodynamic/structural)

Apply online at by 27th March, 2015.

Problem in printing out the global stiffness matrix

Hi everyone,

I'm using UEL in ABAQUS. My model just has one 4-node element (defined in UEL) fixed in one end. When I'm running the UEL, it's working without any problm. But when I' trying to print out the global stiffness matrix I'm getting this error: "aborted with system error code 1073740940".

This is the way that I'm trying to print it out:


How to define a specific time active force curve in Abaqus

I was trying to create a load curve associated with time, such as a sine curve at the beginning, and then the force vanishes. Therefore, I cannot just use the periodic curve directly. I tried to input two loads periodic sine curves(same step) so that at a later time like t_0 the total load is cancelled. But it seems the displacement reaction is kind of weird. Is this the right way to do this kind of load-time curve, or is there another better way? Thanks a lot.


why i got different geometry shape in ABAQUS viewer / import part

Hi everyone,

I was trying to export a deformed geometry from ABAQUS. So, I chose a method found online which is using CAE to import the ODB file, i.e. File -- Import -- Part -- File Filter -- Output Database option and specify the deformed shape and then save it as an input file. 

However, what I got by importing the ODB is different with that shown in the simulation result. Could anyone tell me why is that? And How could I get a correct deformed geometry.  



shahram's picture

Looking for Postdoc position in UK, USA or Canada

My PhD in  Mechanical Engineering Dept. of Middle East Technical University, Turkey ended by Dec. 2014. In both M.S. and PhD I studied the numerical analyses of metal forming processes with ABAQUS together with huge experimental works. I have a patented idea in hydroforming of sheet metals in my M.S. and also I have developed a Ductile Fracture Criterion during my PhD which means I have a robust background of computational mechanics.

Looking for Research/Postdoc Opportunity.

Dear Fellow Members,


I am currently pursuing my PhD research under the supervision of Prof. Ralf Müller at the Institute for Applied Mechanics, TU Kaiserslautern, Germany. I have submitted my dissertation on October 2014. And expecting to defend my PhD work on March, 2015.


Fangsen's picture

Research Scientist at IHPC, A*STAR, Singapore (Vibration and noise)

You will be responsible for using numerical methods and computer software to design, develop and validate novel window system. You will also be involved in theoretic analysis and characterisation of conventional noise control design such as microperforated panel (MPPs) and advanced active approaches such as active structural acoustics control. You will also evaluate prototypes and optimising the design until it works by using modelling and simulation as the main tool.


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):



grassl's picture

Lecturer/Senior Lecturer at University of Glasgow

At the School of Engineering at the University of Glasgow, there is a position open for a Lecturer/Senior Lecturer in the area of Mechanics and Materials (experimental or computational).

Have a look at:

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:

elastomeric ligature


I would like to simulate the behavior of an elastomeric ligature used in orthodontic apparatus. I know that its behavior is hyperelastic can anyone hel^p me in the choice of the material property thanks a lot. 

Modal analysis of composite wind turbine rotor

I have built shell model of a wind turbine rotor in Abaqus CAE and i have run modal analysis. I see that the first natural frequency is around 1 Hz which is sensible but the displacements are very small 10^-12 which does not make much sense. Max Displacement in the model is always 1 in modal analysis. I am not sure how it is 10^-12 here. Since, the displacements are so small, I cannot increase the scale factor (Exaggerate) for visualization to see where is the problem.


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