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Analysis time problem when combining UEL and UMAT

Submitted by Roche on
Hi,

I have a model which includes damage propagation,heat transfer and effect of humidity. For damage analysis I'm using a UEL, and for the rest I'm doing a coupled thermal- displacement(CTD) analysis using UMAT and UEXPAN. The analysis starts with applying a load of humidity and temperature from 0 to a final value, and then in STEP2 I apply a cyclic load in a same range.

CALL FOR ABSTRACTS: International Conference on Experimental Solid Mechanics, 18-19 February 2014, Tehran, Iran

Submitted by Majid Ayat on

 

The Second International Conference on Experimental Solid Mechanics (X-MECH 2014) is being organized by the Center of Excellence in Experimental Solid Mechanics and Dynamics affiliated to the School of Mechanical Engineering at Iran University of Science and Technology. Further details can be found at: 

http://xmech.iust.ac.ir/

 

PhD Openings - COHMAS Laboratory, Kaust

Submitted by malfano on

PHD STUDENTS - FELLOWSHIPS 

The Division of Physical Sciences and Engineering at King Abdullah University of Science and Technology (KAUST) invites applications for 2 PhD positions in Mechanical Engineering at the Composite and Heterogeneous Material Analysis and Simulation Laboratory (COHMAS, http://cohmas.kaust.edu.sa). 

Position 1: local identification of material parameters using full-field measurement

Post Doctoral Openings - COHMAS Laboratory, Kaust

Submitted by malfano on

POST DOCTORAL FELLOWSHIPS 

The Division of Physical Sciences and Engineering at King Abdullah University of Science and Technology (KAUST) invites applications for 5 Postdoctoral fellows in Mechanical Engineering at the Composite and Heterogeneous Material Analysis and Simulation Laboratory (COHMAS, http://cohmas.kaust.edu.sa). 

Position 1: modeling of degradation in flexible electronics

Position 2: non-destructive testing using impedance tomography

Ph.D. position in Computational Solid/Structural Mechanics at the University of South Carolina

Submitted by jeonghoonsong on

We are currently looking for a graduate reserarch assistant (Ph.D. applicant) in the area of Computational Solid/Structural Mechanics. Ph.D. applicants with a M.S. degree in the area of structural engineering or solid mechanics will be preferred. Experiences of developing Fortran (or C++) code will be a strong plus.



If you are interested, please e-mail your CV to jhsong(at)cec(dot)sc(dot)edu

 

Hyperelastic model Umat

Submitted by Nedved on

Good mornig everybody ,



I wrote a Umat routine for the Yeoh hyperelastic model,

In order to compare the built in yeoh model and my Umat subroutine , I apply a uniaxial displacement on a single element and compare the stress strain rates

the problem is that I obtain different curves for the strees strain rates , and a different deformation  I can't figure out why ,



My question is, do you have any documents or links describing the theory for the Yeoh model, and could you please have a look at my Umat code, attached here.