Skip to main content

Using User Subroutine UMAT in abaqus

Submitted by sanjay2008 on

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

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

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

Failure criteria in composites materials

Submitted by Evandro S. Silva on

Hi all,

I would like to know how I put failure criteria in Ansys. I tried put in General Postproc --> failure criteria --> Add/Edit (FC datas), but the results always fail. I am modeling a simple plate, displacement on left side (all DOF) and applaying a pressure in the other side. Does somebody know how I can do this?

Thanks in advance

Silva

Large Deformation Viscoelasticity and ANSYS Validation

Submitted by shrimad on

I am developing a fea code for a glass compression molding process. (involves contact analysis, viscoelastic material, axisymmetric analysis, quadrilateral element, small deformation model). With a small deformation model, I get an exact match with ANSYS, but the volume is not conserved after deformation. I want to conserve volume, and if I enable 'NLGEOM ON' in ANSYS the volume is conserved.

Post-Doctoral Opportunities on Molecular Modeling, Strachan Group, MSE, Purdue University

Submitted by strachan on

We are seeking to hire an outstanding candidate as a post-doctoral fellow to work on large-scale molecular dynamics of polymers and polymer composites. The project focuses on the characterization of the molecular mechanisms that govern the mechanical responseof these materials. The successful candidate will work in the Strachan group and will have the opportunity to interact with experimentalists and theoreticians in academia, industry and national labs.