| iMechanica

I am applying the moving thermal gradient in axial direction. Our FEM code(Newton Raphson) is converging for first increment but after that it is diverging. I have used 8 noded serendipity element with 9 gauss point.

Anyone can please help me that why it is happening?

Thanks

Raj

Lie Derivative, Deformation Rate, Velocity Gradient

Submitted by John Craighead on Fri, 07/09/2010 - 20:08

I'm trying to understand elastic deformation using the Lie derivative. I've read a good summary on Wiki but want other sources to review. Can anyone offer any sources &/or explanations. I need something fairly basic. Thanks, John.

Rayleigh damping: how to match the model frequences to the frequences of the measurements?

Submitted by Mike W. Long on Thu, 07/08/2010 - 18:09

damping mechanical elastic body measurements modal analysis

I hope that the mecanicians can help me to solve my problem.

Is there any possibility to match the frequences of the physical model to the mesurement data?

Modal Analysis in Ansys to get natural frequencies and compare them with theory results

Submitted by pietro maisto on Wed, 07/07/2010 - 09:59

software

Modal Analysis

Cantilever Beam Vibration Modeshapes Natural Frequencies

Hi, I'm Pietro, a short term Italian incoming student at VT (virginia tech).

My advisor, in order to start my thesis there about skin friction coefficients in a scramjet combustion chamber, gave me a Modal analysis to do on a gage described as follow:

a cantilever beam (1mm diameter and 3cm long cylindrical shape) with 1mm depth and 1cm diameter cylindrical flat "hat" attached upon.

Base constraints: zero displacements, zero rotation