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Modeling Free Vibration of a doubly-clamped beam with initial stress

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Hello all,

I am interested to simulate the eignefrequency analysis of a doubly clamped beam which is under a certain initial stress due to fabrication.

Can anybody help me to define the initial stress tensor parameters in terms of x,y,z elements and sign accurately?


Thanks,
Nilufar

1 Reply Last Post Feb 26, 2012, 2:39 a.m. EST
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

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Posted: 1 decade ago Feb 26, 2012, 2:39 a.m. EST
Hi

To write out thefull stress tensor is very tricky (at least I find so) the easiest is to reconstruct the stress how it appears, there is at least one model in the model library of a two layer plate being prestressed by differential themal exansion mimiking the manufacturing process. This then, via a stationary or combined statonary analysis can give you the initial stress for the eigenfrequency analysis

--
Good luck
Ivar
Hi To write out thefull stress tensor is very tricky (at least I find so) the easiest is to reconstruct the stress how it appears, there is at least one model in the model library of a two layer plate being prestressed by differential themal exansion mimiking the manufacturing process. This then, via a stationary or combined statonary analysis can give you the initial stress for the eigenfrequency analysis -- Good luck Ivar

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