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How to study a inverse problem? Know the orbit, solve the constraint condition.

Submitted by pcmagic on
research
inverse problem
solve the constraint condition
analytical mechanic
analytical method

Dear all,

Now I face a noval problem, and I do not know how to deal with it, even cannot begin the first step.

As we know, the formulation of a classical mechanical question  is given the initial condition and the constraint condition, and solve the unknown orbit. Now I face a inverse problem. I know the initial condition and the orbit, and would like to solve the unknown constraint condition.

Is there anyone could give some seggestion, I don't know how to do it. Thanks.

Best. 

Selection of element bsed on the location in abaqus using python script.

Submitted by rajesh2902 on
research
finite element analysis
ABAQUS
Python

Hi

I'm facing problem while writing a script for a parametric study.

After changing the each parameter the model changes and and the loaction of the interested element changes based on those parameters.

Also the element number changes.

Is there any command in python script to choose the elements based on the location ? 





Thank you in advance



Rajesh Kumar

The Geometry of Discombinations and its Applications to Semi-Inverse Problems in Anelasticity

Submitted by arash_yavari on
research
Nonlinear elasticity
residual stress
defects
Geometric mechanics

The geometric formulation of continuum mechanics provides a powerful approach to understand and solve problems in anelasticity where an elastic deformation is combined with a non-elastic component arising from defects, thermal stresses, growth effects, or other effects leading to residual stresses. The central idea is to assume that the material manifold, prescribing the reference configuration for a body, has an intrinsic, non-Euclidean, geometric structure. Residual stresses then naturally arise when this configuration is mapped into Euclidean space.

Masters/Ph.D position available

Submitted by Karthic_Narayanan on
research
computational mechanics
finite element methods
Modeling and Simulation

 On behalf

 A fully funded Masters or Ph.D student position is available @ Monash University, Malaysia Campus. The project will be supervised by Dr.Ean Hin OOI (http://scholar.google.com.sg/citations?user=SAj61qwAAAAJ&hl=en ). Kindly email your enquiries to Ooi.Ean.Hin [at] monash.edu (Ooi[dot]Ean[dot]Hin[at]monash[dot]edu)

Implementing XFEM in ABAQUS using dynamic implicit step

Submitted by Vinod.Kushvaha on
research

Is there anybody who has implemented XFEM in ABAQUS using dynamic implicit step? My model runs fine when I use 'static, general' step but when I change it to 'dynamic, implicit' I get following error message"The following XFEM cracks are failing to correctly generate and says crack domain contains invalid element shape." Please let me know what do I need to change in the model to fix this error. 

Thanks so much for your help,

Sincerely,

Vinod Kushvaha 

How the pressure in ANSYS is implemented?

Submitted by Breslavsky on
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pressure
ansys

There are several possibilities for the realization of the presure load.

For
example, when I apply a pressure to an area (lets say, thin rectangular
plate) the area of the plate grows during the deformation process. One
possibility is to keep the pressure per unit area constant (in this case
the total force acting on a plate grows during the deformation) and the
second is to keep constant the total force acting on the plate (in this
case the force per unit area decreases with the deformation). I looked

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