International Journal of Structural Changes in Solids
ijscs [at] mengr-tamu.org (International Journal of Structural Changes in Solids)
Mechanics and Applications
An open access journal
ijscs [at] mengr-tamu.org (Volume 1 No.1, 2009 )
Plasticity
Writing User Subroutines with ABAQUS
Dear All,
I think that many students are looking for some tutorials about writing a UMAT in ABAQUS.
You can find a comprehensive tutorial for elastic problems.
This file contains:
• Motivation
• Steps Required in Writing a UMAT or VUMAT
• UMAT Interface
• Examples
Example 1: UMAT for Isotropic Isothermal Elasticity
Example 2: UMAT for Non-Isothermal Elasticity
Example 3: UMAT for Neo-Hookean Hyperelasticity
On the Path-dependence of the J-integral near a Stationary Crack in an Elastic-Plastic Material
Submitted to the Journal of Applied Mechanics on 2/1/2010.
Case Studies in Mesoscale Field Dislocation Mechanics
(in Computational Methods for Microstructure-Property Relationships," Springer. Edited by Somnath Ghosh and Dennis Dimiduk)
Dislocation mediated continuum plasticity: case studies on modeling scale dependence, scale-invariance, and directionality of sharp yield-point
Claude Fressengeas, Amit Acharya, Armand Beaudoin
How to deal with negetive plastic strain increment in FEA in an elasto - plastic problem
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In case of elasto-plastic problem it is mentioned that unloading of an integration point should be started along the elastic moduli when the solution gives a negetive increment of the plastic strain at the integration point. If anyone could elaborate it a little more, it will be really helpful.
Thanks
Shape memory alloy material models including plasticity implemented in ABAQUS
I am working with shape memory alloys (nitinol), and am in that respect investigating fracture behaviour of NiTi, using, among other things, simulations in ABAQUS. ABAQUS doesn't have a material model that include plasticity unless you pay for it. I am wondering if anyone have implemented either of the following models as a UMAT, and if you are willing to share the code with me.
The models I am interested in are:
Plasticity and elasticity questions
Dear All
I has question about these stresses.
1.Are deviatoric stress generate plastic deformation?
2. Are hydrostatic stress generate plastic deformation?
3.What is the advantage of transferring strain tenser orientation to the principle coordinate axes?
4. What is the difference between rupture and fracture stress?
Help!!! How to calculate the consistency parameter by consistency condition (potential function) of plasitc flow
hi, there!
I have read a "Manual for LS-DYNA Wood Material Model 143"(website: http://www.tfhrc.gov/safety/pubs/04097/sec150.htm#toc_1_5_1 and http://www.tfhrc.gov/safety/pubs/04097/append_e.htm).
I have two question:
How to build a contact model involved the plastic defoemation?
Hello, everyone.
Recently, I am trying to build a plastic contact model to describe teh relationship between the plastic deformation and the contact force, which is a crucial point in my work that dealing with the grasp force in robotics. So, anybody has some ideas about this? Actually, I am attempting to find a analytic model.