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structural mechanics and thermal expansion
Posted Jun 28, 2016, 2:39 p.m. EDT 1 Reply
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Hi
here i was trying to find the thermal expansion of a mirror ( steel ). I was able to apply the physics, structural mechanics and in that linear elastic property i added thermal expansion and applied a temperature difference of 10 deg C. The output values are same as expected but am facing a problem of displacement of whole my object . I placed the mirror to be free floating and by theory it should expand in all direction equally but in my model i noticed that my whole image have shifted in some axis , i guess its because of the change in center. how can i correct it ? ,so that it expands uni-formally in all axis same . i have attached jpegs of my results and please help me to correct my result.
thanks
here i was trying to find the thermal expansion of a mirror ( steel ). I was able to apply the physics, structural mechanics and in that linear elastic property i added thermal expansion and applied a temperature difference of 10 deg C. The output values are same as expected but am facing a problem of displacement of whole my object . I placed the mirror to be free floating and by theory it should expand in all direction equally but in my model i noticed that my whole image have shifted in some axis , i guess its because of the change in center. how can i correct it ? ,so that it expands uni-formally in all axis same . i have attached jpegs of my results and please help me to correct my result.
thanks
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1 Reply Last Post Jun 28, 2016, 4:27 p.m. EDT
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Posted:
8 years ago
Hello Melvin,
See for instance www.comsol.com/community/forums/general/thread/95201/ . This topic has been discussed many times in the Discussion Forum. You need to impose sufficient constraints to remove all 6 rigid body motions, namely 3 rotations and 3 translations.
Best,
Jeff
See for instance www.comsol.com/community/forums/general/thread/95201/ . This topic has been discussed many times in the Discussion Forum. You need to impose sufficient constraints to remove all 6 rigid body motions, namely 3 rotations and 3 translations.
Best,
Jeff