femur modeling

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Aastha Kapoor

Aastha Kapoor

October 14, 2012 1:59pm UTC

femur modeling

Hi!
I am building a model of femur(thigh bone) and aim at studying their stress and strain distribution on applying a pint load.I have built the model but it doesn't seem to compute,and i can't figure out why.Please check the model and point out the errors that need correction.

Attachments:   femurmod2.mph  

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Mayur

Mayur

October 14, 2012 7:04pm UTC in response to Aastha Kapoor

Re: femur modeling

In your model, mesh is not defined in all domains or on boundaries and also it is not fine enough for solver to converge the solution. And under Prescribed displacement you need to select boundary surfaces.

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Ivar Kjelberg

Ivar Kjelberg

October 15, 2012 7:17am UTC in response to Mayur

Re: femur modeling

Hi

I can only stress: avoid using point or edge constrints, but only 1 level lower than domain => boundary loads. All other make singularities and it far more difficult to analyse your models

--
Good luck
Ivar

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Nagi Elabbasi

Nagi Elabbasi
Certified Consultant
Veryst Engineering

October 15, 2012 12:32pm UTC in response to Ivar Kjelberg

Re: femur modeling

You are applying the bone material to the boundaries not the domains, and the same for the mesh. Both should be defined at the domain level unless you want to use shell elements.

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Aastha Kapoor

Aastha Kapoor

October 15, 2012 1:17pm UTC in response to Nagi Elabbasi

Re: femur modeling

Thank you for your valuable reply Sir.
I am stuck at an error saying "System matrix is zero".Is there a way to rectify it?

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Aastha Kapoor

Aastha Kapoor

October 19, 2012 2:01pm UTC in response to Aastha Kapoor

Re: femur modeling


Thank you for your valuable reply Sir.
I am stuck at an error saying "System matrix is zero".Is there a way to rectify it?

Though i have changed from point load to a boundary load,and want to plot von-mises stress distribution,the computation shows errors,with the system matrix being zero.Pls let me how to work on it?

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Mayur

Mayur

October 19, 2012 2:15pm UTC in response to Aastha Kapoor

Re: femur modeling

If you would have followed mine and Nagi's suggestions, you should get the solution.

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