Blog posts

I am trying to implement an analytic formulae of dynamic flow stress in material plasticity in abaqus. The model is similar to FlowStress=K*(PlasticStrain^n)*(StrainRate^m).

Could you provide help for these 2 questions?

1: Is it OK to define Young's modulus (E) and v in "Elastic" and choose "User" in "Plastic-->Hardening" with the subroutine "VUHARD", instead of by "VUMAT" with plasticity criterion and calculation of delta stress and strain?

Gibbs free energy and constitutive equations

Submitted by Andrej Puksic on Mon, 05/25/2009 - 13:24

research

constitutive modeling

I don't know if my understanding of the following is correct, so I would appreciate your comments. I have an expression for Gibbs free energy of a material G=G(σ,T,...). Is it correct to derive the equation for strain as ε=∂G/∂σ ?

cracked rotor

Submitted by pushpendra sin… on Mon, 05/25/2009 - 12:43

education

sir

can i find natural frequencies of cracked rotating shaft in ansys.i am using contact elements to model crack due to which nonlinearity comes into picture.since modal and harmonic analysis cannot solve nonlinear problems,so please tell me in detail the steps to find natural frequency .

my project submission date is on 15th june and i have no results.pls reply as soon as possible

it will be yr great help.

thanks in advance

pushpendra

iit roorkee

Composite plate analysis using ansys. coding using matlab

Submitted by kiraniisc on Mon, 05/25/2009 - 11:16

research

hi friends,

I have coded for laminate using matlab. for further analysis i want code for composite plate simply supported at all 4 edges.

then analyse with ANSYS. and use optimization techniques for optimizing the plate.

material : Graphite /eposy

thickness of each lamina : 0.127

Seq [45 0 -45]

Please anybody know how to code for composite plate and do stress analysis using Ansys.

feel free to share ur thoughts

Final presentation

Submitted by Zhiyan Wei on Mon, 05/25/2009 - 03:54

Attached is my final presentation.

Final presentation slides

Submitted by bjordan555 on Sun, 05/24/2009 - 23:57

Here are the slides for my final presentation for ES 241. During the presentation, a few suggestions were made, which I plan to follow up on. Please check back here or subscribe for updates.

Slides on Pressure and Chemical Potential

Submitted by Tony Rockwell on Sun, 05/24/2009 - 17:40

Here are some slides I made on the subject of "Pressure and Chemical Potential" for the final meeting of Prof. Zhigang Suo's ES 241 class in the Spring of 2009.