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Using user subroutine UMAT in abaqus

Submitted by sanjay2008 on

Hi,

     Thanks for the earlier feedback. I was able execute the user subroutine (UMAT) along with *.inp file only to land into new type of error message:

fatal error lnk1112: module machine type 'IA64' conflicts with target machine type 'X86'

Can somebody please help me to understand what this error means and how to overcome this monster.

I have already installed intel fortran compiler, and microsoft visual studio for windows. 

As always thanks for the much needed help. 

 

Fatigue damage initiation - computational methods

Submitted by pragtic on
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Fatigue
damage
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Dear iMechanicians,

It seems that nobody here is active in fatigue life prediction focused on the initiation period. I believe it should be here and do not understand why the fracture mechanics has its place here but the initiation of cracks has been forgotten. Although cracks are very interesting there is a lot industrial sectors, where they are not wanted. Is not the reason of the current situation that the available computational tools that are free are mostly related to crack growth?

Regards,

Jan Papuga

 

Measurements of near-ultimate strength for multiwalled carbon nanotubes and irradiation-induced crosslinking improvements

Submitted by Horacio Espinosa on
research
MEMS
NEMS
carbon nanotubes
electron microscopy

For more than 15 years, carbon nanotubes (CNTs) have been the flagship material of nanotechnology. Researchers have conceived applications for nanotubes ranging from microelectronic devices to cancer therapy. Their atomic structure should, in theory, give them mechanical and electrical properties far superior to most common materials.  

Using User Subroutine UMAT in abaqus

Submitted by sanjay2008 on
research

Hi,

Iam a new user of abaqus. I have a subroutine written in *.for format. I also have an input file *.inp . Both these programs are in the same folder. When I try to execute the *.inp file using the command

abaqus job=jobname datacheck interactive

I get a  message saying  "Abaqus/Standard Analysis exited with an error. please see the message file for possible error messages". I looked in the message file and it says ***ERROR: USER SUBROUTINE UMAT IS MISSING.

Then I used the command

abaqus job=jobname user=umat.for

Three-point bending

Submitted by ColinGrant on
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For a three point bend test, the bending angle of the beam has to be small - so small that (theta)=tan(theta).... this is necessary to make a substitution of the reciprocal radius of curvature 1/R = M/EI... which then can be assumed to be the second derivative of the beam deflection.

Might sound stupid, but would the bending angle assumption be measured in degrees or radians?

Comparison - mechanics research in Europe and in America

Submitted by kwlim on

Can anyone shed some light on the differences in terms of mechanics research here in the US and in Europe? Is it true that larger scale research is done here in the US there's more funding opportunities here?  How do you compare the two? What about difference in terms of research focus and topics?

5th IC on Fracture of Polymers, Composites and Adhesives - just 4 weeks to go!

Submitted by Dean Eastbury on
conference
fracture mechanics
polymers
Composites
adhesives

The 5th International Conference on Fracture of Polymers, Composites and Adhesives will be held in the beautiful Alpine village of Les Diablerets, Switzerland, 7-11 September. Les Diablerets is situated 120 km from Geneva's international airport and is easily reached either by car or by public transport.

The full oral and poster programs, as well as registration details can be found on the conference website at www.tc4pca.elsevier.com

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