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Pre-stress & Initial stress

Hi AllI am working on Simulation of nonlinear phenomena in MEMS devices. I do not know for residual stress in Microcantilever beam I should use pre stress or initial stress. I checked initial stress by Shell 181 and solid 186, but answers are for from experiments (around 100 times). I do not know what the difference between initial stress and pre stress is.

 

 

ramdas chennamsetti's picture

R. Chennamsetti, Scientist, R&D Engineers, India

I think pre-stress is always associated with some pre-strain. But, initial stress need not have a corresponding initial strain.

For example, take a free bar, heat it. Initial strain is developed because of heating. But, there is no corresponding initial stress. Similarly with the initial stress also.

The initial stress need not have a corresponding initial strain.

 

Prof Joseph ZARKA Scientific Director CADLM 9 Rue Raoul Dautry 91190 Gif Sur Yvette (France)

Prof Joseph ZARKA Scientific Director CADLM 9 Rue Raoul Dautry 91190 Gif Sur Yvette (France)

I cant add formula please contact me directly

Hi, all!

   Do you guys try to use python to create initial stress. It bothers me for a long time. Please cantact me directly if you know it.

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