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Unconverged Mohr-Coulomb Plasticity, ABAQUS

Submitted by gcorral on

Dear Abaqus Users,First of all, I want to clarify that I am a beginner in Abaqus (only few months) and new in iMechanica. I have been modeling an excavation in Abaqus/CAE. I am using several layers of soils which have been modeled using Mohr-Coulomb model, the wall as an elastic material. Both the wall and the soils were modeled with 2D solid elements (plane strain).I have been facing with lots of problem with the interaction of the first layer and the wall, "UNCONVERGED MOHR-COULOMB PLASTICITY" in the GEOSTATIC STEP!!!!.

How to change the value of time increment every step in vumat?

Submitted by Wang Guofeng on

Hello, all

 

I have a new question in using vumat. As you know, time increment, dt,  is usually  determined in the xxx.inp before calculation. I know there are two ways, automatic or constant.

I want to know if there is the third way. So, I can control the value of dt for every step according one state variable I defined. 

This idea seems a little crazy. But this is really very important for my code.

Please give me some help.

 

regards;

wang 

Should we be patenting our research

Submitted by ericmock on

I recently stumbled across the patent that is attached to this post.  It's title 'Simulation of String Vibration' obviously caught my attention.  Hoping there was more to it, I downloaded and read it.  To save you the time, I'll summarize.  It basically reads like a conference paper that would probably not get accepted into any respectable journal.  What is patent is a little more specific than the title would imply but nothing that is any more than a trivial extension of existing research.  Essentially the patent describes a way (finite elements) to simulate t

Post-Doctoral Research Position in Experimental Mechanics, University of Delaware

Submitted by Michael H. Santare on

We seek a highly qualified applicant for a post-doctoralresearch position in experimental mechanics and materials.  The successful candidate will designand conduct experiments establishing mechanical properties of thin polymerfilms and layered composite materials at a range of temperatures and humidityconditions. The project aims towards improving the durability of polymer fuelcells and is funded through DOE. Funding for this position is availableimmediately for a period of one year and may be renewed thereafter.

 

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Submitted by onlinesurvey on
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NANO-SCALE CALORIMETRY

Submitted by Anonymous (not verified) on

POST-DOCTORAL RESEARCH POSITION IN EXPERIMENTAL MATERIALS SCIENCE

School of Engineering and Applied Sciences, Harvard University

The Harvard School of Engineering and Applied Sciences seeks highly qualified applicants for a post-doctoral research position in experimental materials science.  The successful candidate will participate in a project to design an apparatus for high-temperature calorimetry on nanoscale quantities of materials. This apparatus will be used to study phase transformations in complex ternary and quaternary materials systems.

any idea about boundary conditions to be used when modelling a unit cell of a foam

Submitted by pthiyaga on

Dear friends / distinguished imechanicians,

I am trying to use micromechanics in  foams to numerically compute the elastic constants using one unit cell. I see some literature available when simple unit cell shapes are assumed (like cubical or hexagonal). However there is nothing specific about modelling for tetrakaidecahedral foams. Assuming the right boundary conditions would be critical for computing the constants. I am not able to come up with a reapeating pattern for determining the places to apply the boundary conditions.