Hi guys & girls,(adsbygoogle = window.adsbygoogle || []).push({});

I have a problem, I am trying to calculate the residual stress as a function of depth of each layer.

I am using a Focused Ion Beam system to milling/removal thin layers of material from each layer of this cantilever, & measuring the deflection.

I can obtain the average stress in each layer after removing the whole layer by using Stoney's equation. But am trying to predict / calculate the residual stress through the thickness of the layers.

The main problem I am having is that I have no idea how to find the neutral axis each time i remove a thin layer of each of the different layers.

the beam is made of Ti, SiO2, & Si. with Young's modulus 110, 85, 130 G Pa respectively.

Can anyone help?! I am so confused!

Cheers

Toby

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# Residual stress in 3 layer cantilever beam

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