Skip to main content

How to calculate the stress increment of a single crystal using VUMAT

Submitted by shiyao on
Forums
Computational Mechanics Forum

Dear all,

I am writing a program for crystal plasticity using VUMAT. I met some problems, hope you guys can help me out.

Assume each node represents a single crystal. At each step, VUMAT will give strain increment which is based on curent configuration(right?)

Then I can calculate the shear strain in each slip system and obtain the plastic deformation gradient. So I can get the elastic deformation gradient for current step. Using polar decomposition, rigid body rotation matrix can be obtained.

Call for Papers - The Tire Society

Submitted by wvmars on
conference
micromechanics
materials modeling
rolling contact
dynamic rolling contact
Bicycle tires
tire
vehicle dynamics

Final Call for Papers - 28th Annual Conference & Meeting on Tire Science & Technology

September 15 & 16, 2009, Akron City Centre Hotel, Akron, Ohio, USA

 Full details can be found here.

www.tiresociety.org

Note that there is a $500 award for the best student-authored paper.  Details can be found here.

High SIF in plane stress

Submitted by ramdas chennamsetti on

Hi all!!!

I have a very basic question in Fracture Mechanics. The question is as following.

"Stree Intensity Factor (SIF) is more in plane stress problems (plasic zone size is big) than in plane strain problems (plasic zone size is small). How do we explain this, without refering or invoking energy conecpt?"

I request to give some thoughtful explanation.

With regards,

- Ramdas

ADINA: Automatic Dynamic Incremental Nonlinear Analysis

Submitted by ADINA Support on
software
structures
dynamics
nonlinear
finite element
Implicit
Explicit
fsi
solids
CFD
Multiphysics

The ADINA System offers comprehensive capabilities for linear and nonlinear finite element analysis of solids & structures, CFD, fluid-structure interactions, multiphysics, and complete pre- and post-processing with interfaces to various CAD and CAE systems. It also offers user subroutines for material models, elements, loads...

cohesive element

Submitted by llguang on

Hello everyone,I am researching the dynamic crack propagation problem using the cohesive element.At this moment, I am using the LS-DYNA (971)software's cohesive material model ,But it does't consider the penetration of bulk elements when the cohesive elements after deleted or not deleted. so the bulk will penetrate each other when under exterior dynamic load. From the literature, I know that many reserachers use the solver which is writern by themselves,and the cohesive element also writen by self. How can some kind expersist give me a tutoial ,Thanks.

 

Ph.D. Research Assistantship Position in Multi-Scale Computational Study of the Fracture of Concrete at CU Boulder

Submitted by Franck Vernerey on
job

A Ph.D. Research Assistantship position in multi-scale computational mechanics of fracture of composites (with application on concrete) will be available to start in January 2010 in the Department of Civil Engineering, at the University of Colorado at Boulder, Colorado, USA.

Subscribe to