iMechanica - Pre-stress & Initial stress - Comments

Can you see the difference between these two formulations ?

Joseph ZARKA — Mon, 12 Nov 2007 09:06:02 -0500

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

I cant add formula please contact me directly

It is sure that many people are not familiar with initial strain

Joseph ZARKA — Mon, 12 Nov 2007 08:52:14 -0500

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

Initial strain need not have initial stress...

ramdas chennamsetti — Mon, 12 Nov 2007 06:18:59 -0500

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.

Pre-stress & Initial stress

Amin — Sun, 11 Nov 2007 15:15:39 -0500

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.