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6 Replies
Last post: March 15, 2013 2:18pm UTC
March 14, 2013 3:34pm UTC
Thermal stress analysis
Hi sir,
i have analysed thermal stress by passing the laser beam on rectangular plate (through structural mechanics module).i used stainless steel temp dependent material properties to my simulation. i used elasto plastic properties yield and tangent modulus. i have attached the properties also.i satisfied with results of deformation of plate and temperature profile. but my major problem is von mises stress exceed the ultimate stress level.
how can i reduce the stress value??
is there any possible to use smooth function.
please help me genius.
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March 14, 2013 10:13pm UTC in response to uday
Re: Thermal stress analysis
Hi
I do not catch you there ? smoothing the table values (use an interolation functon with a higher order setting) will not change the stress reached, or ?
--
Good luck
Ivar
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March 15, 2013 8:35am UTC in response to Ivar Kjelberg
Re: Thermal stress analysis
dear ivar,
Thanks for your reply.i used temperature dependent properties by using interpolation function.but i am getting 700mpa von mises stress .but stainless steel ultimate tensile strength is 515 mpa.
i used interpolation function.but what is higher order setting??
can you help me?
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March 15, 2013 11:11am UTC in response to uday
Re: Thermal stress analysis
Hi
first of all I hope its Mega and not milli Pascal you are referring to ;)
But I do not catch you, is it the interpolation function that get far out, or is it the results of your simulation ?
--
Good luck
Ivar
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March 15, 2013 1:20pm UTC in response to Ivar Kjelberg
Re: Thermal stress analysis
Dear ivar,
sorry for my explanation. this is my final result Von mises stress value about 700 Mega Pascal. von Mises stress I got from Comsol too high (>>yield strength of materials) than I expected.
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March 15, 2013 2:18pm UTC in response to uday
Re: Thermal stress analysis
The ultimate tensile strength of the material is not accounted for in the elastic-plastic material model you are using. Therefore if the strains are high enough you can get stresses around 700 MPa. That would require a very large temperature increase though and an overly constrained structure. What temperature increase are you applying? Check also that you are using an elastic-plastic material and not just elastic.
Nagi Elabbasi
Veryst Engineering
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March 15, 2013 2:18pm UTC in response to uday
Re: Thermal stress analysis
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