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Hi, everyone
I am a new user for VUMAT. I am simulating the impact behavior of the laminates.
I search for the vumat file from Mr.Benz in this forum
But when I try it the error is strange:"No vumat subroutine was supplied for the user material named: cfrp

Abaqus/Explicit Packager exited with an error - Please see the  status file for possible error messages if the file exists."

Hierarchical analysis of the fracture toughness enhancement of carbon nanotube- (CNT-) reinforced hard matrix composites is carried out on the basis of shear-lag theory and facture mechanics.

Hi All,

I am dealing with contact problems. Can you please post if you have any information on how to resolve the general contact problems.

 thanks and Regards,

Ravitej

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   

1. We highlight a study performed by researchers using ADINA in which they investigated a computational approach to construct patient-specific ventricle models based on in vivo cardiac magnetic resonance (CMR) imaging for surgical planning and optimization. The study was motivated by the fact that the use of such computational models can help to assess different surgical hypotheses and replace empirical and perhaps risky clinical experimentation. For more information please see

http://www.adina.com/newsgH81.shtml

The successful candidate will work on the EPSRC funded research project 'Ultimate and permissible limit state behaviour of soil-filled masonry arch bridges', which is being undertaken in collaboration with the University of Salford and various industrial partners (Network Rail, ADEPT, the International Union of Railways and Balfour Beatty Rail). This is an exciting opportunity to help develop the next generation of analysis and assessment techniques for masonry arch bridges, thus helping to ensure a sustainable future for structures that continue to form a vitally important part of the rail and regional road networks of the UK and other countries.

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??

Postdoctoral Fellowship in Smart Materials
Temple University, Composites Laboratory

Multiple one-year Postdoctoral appointments in the Mechanical Engineering Department, Temple University, are available immediately with possibility for annual renewal up to three years.

Salary and benefits are competitive, with compensation commensurate with experience.

Speakers now announced for 4th International Conference on the Mechanics of Biomaterials and Tissueswww.mechanicsofbiomaterials.com/speakers.html
11-15 December 2011, Marriott Waikoloa Beach Resort and Spa, Hawai’i
Submit your abstract by 15 April 2011
www.mechanicsofbiomaterials.com

The Mathematical Institute at Oxford is advertising three post-doctoral positions within the Oxford Centre for Collaborative Applied Mathematics for(ideally) a 1st April 2011 start. The project titles (with links for more information) are:

1. Brain Mechanics, Cortex Folding, and Pattern Formation in Growing Tissues.
http://www.maths.ox.ac.uk/node/1405

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.