User login

You are here

blogs

H.Rahnama's picture

A UMAT Code In ABAQUS - Progressive Failure Analysis

I have written a UMAT code in ABAQUS. This UMAT degrades the young modulus of an isotropic elastic material at a point when the VonMises stress at that point reaches a specific value. It can be seen as a simple progressive failure code. I have applied this UMAT code to a Notched plate under uniform tension.

The problem is that exactly before the damage initiation, the ABAQUS/Standard diverges. I am sure that there is a very simple mistake that I just can't see!
:)

Oleksandr Glushko's picture

Recovery of electrical resistance in copper films on PET subjected to a tensile strain

For flexible electronics applications it is important to understand the behavior of electrical resistance of metal films on polymer substrates under applied tensile strain. Although the growth of resistance during tensile loading was investigated in a number of research papers, the recovery of resistance during unloading remains virtually unexplored. In this paper, substantial recovery (decrease) of electrical resistance during and after unloading is demonstrated for copper films on polyethylene terephthalate (PET) substrates subjected to a tensile strain with different peak values.

Non Linear Analysis Ansys

When Working on Ansys Non Linear Static Structural Analysis, I couldn't comprehen while defining and assigning material properties to corrosponding bodies.

When I give different random values for density in Engineering Data and runing the jobs parallely the results look SIMILAR for all the independent values, I couldn't fish out on what basis do the software is giving out results.

Xiaofei Hu's picture

Which IDE are you using for ABAQUS coding

IDE is the environment where we code, we have VS2008 for c++/c ... coding, and we also have "Qt creator" for qt related c++ coding. Do you have any idea on a friendly IDE for ABAQUS coding?

 

Thanks.

Time Domain Inverse Problems in Nonlinear Systems Using Collocation & Radial Basis Functions

Time Domain Inverse Problems in Nonlinear Systems Using Collocation & Radial Basis Functions

by T.A. Elgohary, L. Dong, J.L. Junkins and S.N. Atluri

This paper can be freely downloaded at: http://care.eng.uci.edu/pdf/Dong2014d.pdf

 

In this study, we consider ill-posed time-domain inverse problems

for dynamical systems with various boundary conditions and unknown controllers.

Dynamical systems characterized by a system of second-order nonlinear ordinary

Acoustic Heating

All -

Are there good references related to acoustic heating?  I am interested in the ability to scale down the effects of this process and looking for ideas in model development to assist.

Regards,

Luke

Abaqus python script: finding an element containing a given point

Hello!

I have a point with coordinates x,y,z. Is it possible to detemine from python script to which element this point belongs to?

 

Thank you!

GOPALAERO2000's picture

ASTM SPECS

Hi everybody,

 

Can anybody help me get the following ASTM SPECS.

 

1. Test method for poison's ratio at room temperature (ASTM STANDARD E 132)

2. Test method for young's modulus, tangent modulus and chord modulus (ASTM STANDARD E 111)

3. E 1237

4, D 3039

5. D 2584

 

Thanks and regards

M Gopalakrishnan

Zhigang Suo's picture

Fundamental discoveries in mechanics in recent decade or so

A previous post, Getting Ready for Extreme Mechanics Letters, contained the following paragraph:

“We seek papers from researchers in all disciplines. Mechanics appeals to talents of all kinds. Good mechanics has long been created by people from many fields, by Galileo, Newton, Maxwell and Faraday, as well as by Watt, Darwin, Wright brothers and Whitesides. People make discoveries in mechanics often when doing something else (e.g., in seeking evidence for the existence of God, in building cathedrals, in flying airplanes, in laying transatlantic telegraph cables, in fabricating microprocessors, in watching cells move, in fracking for gas, in inventing optical tweezers, in creating soft lithography, in developing wearable or implantable electronics). Mechanics discovered in one field invariably finds applications in other fields.”

Here I would like to give several examples of papers published in recent decade or so. I will link each paper to its citations on Google Scholar, so that you can have an overview of the influence of the paper on other researchers.

Simpleware Case Study: Total Hip Replacement Implant Positioning

CAD and FE models of hip implants

Positioning hip implants poses a number of challenges, particularly in terms of getting bone and implant contact right. While experimental testing can be costly, image-based modelling can be very effective at predicting the best and worst positions for implants. 

Constitutive modeling of hyperelastic solids reinforced by spheroidal particles under large deformations

This paper presents a homogenization-based constitutive model for the mechanical behavior of particle-reinforced elastomers with random microstructures subjected to finite deformations. The model is based on a recently developed homogenization method (Avazmohammadi and Ponte Castaneda 2013; J. Elasticity 112, 1828–1850) for two-phase, hyperelastic composites, and is able to directly account for the shape, orientation, and concentration of the particles.

Rolling Contact in Ansys Workbench

Hi,

 Please refer to the figure given below. I want to model this problem using ANSYS WORKBENCH.

 

R&D engineer opening at Synopsys

This position is for a senior R&D engineer who will work on the development of industry leading Finite Element/Finite Volume simulation tools. Primary responsibilities include developing solid elements and advanced material models.

Requirements:

  (1) Strong mechanics and FEM background

  (2) Solid programming skill in C++

  (3) Ability to work as a team player, as part of a local and globally R&D team

  (4) Good oral and written skills

You can apply online at Synopsys website or forward your resume to me.

 

fem software at altair

we are looking for a fem software developer. The primary focus is developing implicit structure

dyanmics and  fsi algorithms. If interested send resume to xmeng@altair.com 

Faculty recruitment at Southeast University, China

 

Faculty recruitment at Southeast University, China

 

Southeast University is a Key University in China (985,211 project) located at Nanjing City. 

We are searching for new faculty to work in the Department of Mechanics. 

Major needed:  Ph.D.  in Mechanics/Materials Sciences/Physics or related.

Communicate e-mail: jxmeng@seu.edu.cn

 

If you are interested, please send us e-mail without hesitation.  

Welcome!

 

 

To the Editors of EML

Dear Editors,

The first step of starting EML looks promising and with the help of academic people in this community, I think EML has generated enough heat with lots of interesting view points.

We all know that there has been lots of discussion in the imechanica community regarding open source journals, had any one thought about making EML fully open source?.

Thanks and Regards,

Rohith

Lance C. Hibbeler's picture

ABAQUS: nice colorbar ranges

I have produced a python script that automates setting up reasonable values in the ABAQUS/CAE colorbar, basically setting up Tecplot functionality.  After executing the script from File->Run Script, you have access to a function that you can call in the built-in interpreter,

>>> SetContourRange(minval, maxval)

problem with Numeric import in abaqus 6.11

Hi, i'm using abaqus 6.11

i am going to link matlab with abaqus using python scripting to perform an iterative analysis

the problem is that i get the error "ImportError: No module named Numeric"

please help me how to solve this problem

thanks

Aman Haque's picture

Faculty recruitment at Penn State

Dear Colleagues,

Penn State University Mechanical Engineering is accepting applications for five tenure track faculty positions. Please see the website for details

http://www.mne.psu.edu/About/PSU_MNE_Faculty%20Positions_2014.pdf

For the emerging areas - we are looking at themes such as additive manufacturing, metamaterials, 2D materials, data driven modeling, extreme environment mechanics or a fusion of these.

Zhigang Suo's picture

What do we want EML to be? How do we get there?

Starting a new journal is risky.  Starting a new journal in mechanics is particularly risky.  The responses to the two recent posts are encouraging, however.

I'm looking for PhD position [Concrete fracture-FRP bars]

Hi;

I'm a civil & structural engineer, I got recently my Magister degree in civil engineering. I worked on the numerical modeing of concrete fracture of reiforced concrete elements reinforced with FRP bars. I've used ADINA software in my numerical study (smeared crack model). Now I'm looking for a PhD scholarship to complete my research either in concrete fracture modeling or in the composite materials, please I need your help?. Many thanks

Pages

Subscribe to RSS - blogs

Recent comments

More comments

Syndicate

Subscribe to Syndicate