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Hi All,

many a times in abaqus, we get numerical singularity warnings. which are mainly due to rigid body motion in one or more directions. This will generally happen when there is contact closing and opening phenomenon is happening.  How can we resolve these numerical singularities? Please post if you have any additional information.

 Thanks and Regards

Ravitej

I want to model torsion of a homogeneous hollow cylinder in ANSYS. I changed to cylindric coordinate system also. But each time I run the program  the result is that of bending. I have attached the mac file and output file for reference. Please advise.

finish

/clear

/PREP7  

!*  

ET,1,SOLID92

!*  

!*  

MPTEMP,,,,,,,,  

MPTEMP,1,0  

MPDATA,EX,1,,70e9   

MPDATA,PRXY,1,,0.3  

CSYS,1  

CYL4,0,0,1, ,2, ,10 

/USER,  1   

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Job Details
A full-time position is available at Sandia National Laboratories in Livermore, California for an applied mechanics engineer with a strong background in computational solid mechanics, numerical methods and constitutive model development.

I am trying to call VUSDFLD subroutine before VUMAT. I need to access some variables which are not available in VUMAT. Does anyone know how I can force ABAQUS into calling VUSDFLD before VUMAT? Thanks.

 Ahmad

hello everybody
i want to develop a constitutive law for fiber reinforced composite. so i am using umat subroutine to simulate it in abaqus.
when i begin analysis i got error code 144.
my question is: is jacobian matrix DDSDDE can be to cause for this error??

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Dear Colleagues,

I wish to bring to your attention my recent work with Mrinal Iyer on a field theoretic approach to the quasi-continuum method to appear in Journal of the Mechanics and Physics of Solids. Below is the abstract and attached is the preprint of the article. I will very much appreciate your comments and suggestions.

A Field Theoretic Approach to the Quasi-Continuum Method

In Abaqus .inp or Abaqus/CAE, are there mesh generation commands similar to ANSYS commands FILL, NGEN, and EGEN used to geneate nodes (between keypoints) and elements ?

Brown University established a School of Engineering on July 1, 2010 and is beginning a major hiring initiative to fill multiple openings.  As part of this initiative, the School is seeking to fill a position in Solid Mechanics at any academic level to start in July 2011. Topics of interest include but are not limited to: micro/nano-scale solid mechanics, mechanics of cells and biological systems, soft matter mechanics, mechanics of materials for energy applications, computational mechanics, experimental mechanics, multiscale modeling.

For the most up to date corrections to the book, go to http://forum.cadec-online.com/viewtopic.php?f=9&t=34

For the most up to date ERRATA, go to http://www.mae.wvu.edu/barbero/feacm/errata_feacm.htm 

i am working on the stability analysis of cantilever shaft disk 9rotor) systems. i am a beginner in this work. can any one please suggest any books or papers which can help me in my work. i will be grateful to you.

Adhesive bonding is contemplated as an alternative method to mechanical fastening for joining composite aerostructures.
Ongoing research in this area is focused on the development of new bonding techniques and joining elements. In this
article, the mechanical performance of the novel noncrimp fabric (NCF) H-shaped adhesively bonded joints subjected to
tension, shear and four-point bending loading conditions was investigated by both experimental tests and numerical

Can anyone guide me how to get crosshead speed range equal to or greater than 1:3000 in a motorized electromechanical material testing machine? The load capacity should remain same even at lowest speed.

Hi everybody,

I have a question about the shear modulus of polymers. As we know, the general engineering polymers （rubbers） are highly extensible and elastic. The shear modulus，G， for the polymers subjected to the small-strain conditions, can be defined by G=NkT, where N is the number of network chains, k is Boltzmann's constant and T is temperature in Kelvins.

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Submissions for Poster Presentation
The deadline for Poster submissions is fast approaching. To submit your 250 word abstract, go to the online submission system.