Thermal stress analysis

Thread index  |  Previous thread  |  Next thread  |  Start a new discussion

RSS FeedRSS feed   |   Email notificationsTurn on email notifications   |   6 Replies   Last post: March 15, 2013 2:18pm UTC
uday

uday

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.

Reply  |  Reply with Quote  |  Send private message  |  Report Abuse

Ivar Kjelberg

Ivar Kjelberg

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

Reply  |  Reply with Quote  |  Send private message  |  Report Abuse

uday

uday

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?

Reply  |  Reply with Quote  |  Send private message  |  Report Abuse

Ivar Kjelberg

Ivar Kjelberg

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

Reply  |  Reply with Quote  |  Send private message  |  Report Abuse

uday

uday

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.

Reply  |  Reply with Quote  |  Send private message  |  Report Abuse

Nagi Elabbasi

Nagi Elabbasi
Certified Consultant
Veryst Engineering

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

Reply  |  Reply with Quote  |  Send private message  |  Report Abuse

Nagi Elabbasi

Nagi Elabbasi
Certified Consultant
Veryst Engineering

March 15, 2013 2:18pm UTC in response to uday

Re: Thermal stress analysis

Reply  |  Reply with Quote  |  Send private message  |  Report Abuse


Rules and guidelines