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Geometric non linearity-peymann et all

Submitted by kajalschopra on
Forums
Computational Mechanics Forum

Consider attached file.It lists the details of the Timoshinko method for geometric non linear analysis.

Can anyone tell me how is it diiferent from incremental analysis conceptually?

Is it used commercially?Which method is more sophisticated-Timoshinko,incremental or Newton Raphson?

Please help

Question about curve fitting indentation data with large residual strain

Submitted by Yao Jiang on
Forums
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research

I am trying to use finite element modeling of indentation experiments
to extract hyperelastic material parameters. I am having a dilemma,
when the tissue has residual strain, the model couldn't achieve the
high nonlinear relationship between displacement vs reaction force as
measured in the experiments.



I have tried several strain energy potentials,

1) W=A/B*{exp[B(I1-3)]-1}

2) W=C10(I1-3)+C01(I2-3) 

3) W=C10(I1-3)+C20(I1-3)^2+C30(I1-3)^3

4) Arruda-Boyce type model

Johnson-Cook Material Model, Abaqus Explicit

Submitted by D. Barrett Hardin on
Plasticity
ABAQUS
Johnson Cook Plasticity Model

I am currently running a Quasi-Static compression simulation in Abaqus Explicit using the Johnson-Cook Plasticity option. As the strain gets beyond the elastic range, the stress-strain response begins to oscillate +- 5 MPa around the expected curve. Does anyone know why this is happening and/or how to repair the problem?

Thanks, 

D. Barrett Hardin

Weld analysis using ansys

Submitted by sudheesh on
research
weld and plasticity

Inorder to find out the residual stresses and distortions in butt weld due to thermal loads in steel plates, i have used

shell57 for thermal and shell43 for structural.The material properties used are temperature dependent.



I  carried this out in two steps.







The thermal analysis is carried out first.

A moving heat source is used to generate the temperature distribution on the plate.

Looking for a graduate student

Submitted by Dr. Michael No… on
job

HELP WANTED

 

I am looking for a graduate student or a Postdoc who is interested to work on a research project in modeling and simulation of self-healing surfaces and related topics.

The candidate is expected to major in Mechanical Engineering or Materials Science (background in surface mechanics / physics / tribology is preferred), to be comfortable with computational software (MATLAB, Ansys or similar), and to be enthusiastic about producing modeling/computational results and preparing publications.

 

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