COMSOL Forums: Resistivity change vs deflection

Re: Resistivity change vs deflection

Sat, 16 Mar 2013 19:46:55 +0000

Hello Dear Ivar,
Thank you very very much. You solved my problem.

Best regards

Re: Resistivity change vs deflection

Sat, 16 Mar 2013 00:09:54 +0000

Hi

you mean the electric resistance of a conducting media ? I believe so, even the joule heating uses that, implictely, the simples draw your conductor, add one terminal to GND, the second to a given V or I, then solve and plot V/I, it's as simple as that.

Now you can add HT and see it heat up, if your sigma conductance is T dependent you will get R(T), and if you add/replace EC by MEF you can get inductance included for a given frequency

It should be rather straihtforward, no ?

--
Good luck
Ivar

Re: Resistivity change vs deflection

Fri, 15 Mar 2013 16:25:31 +0000

Hi Dear Ivar,
First of all I thank you so much for your answer. I simulat the deflection of the membrane but for calculating the resistivity of a resistor is there any example in COMSOl 4.3?

regards

Re: Resistivity change vs deflection

Fri, 15 Mar 2013 02:11:44 +0000

Hi

normally you can get impedance info from the defalt lumped port/terminal variables, and for the deflection you must define as a new variable with i.e. an integration of a point, or an average (coupling operator) over a bondary (often cleaner).

Then solve for a parametric seep such to scan your stress levels / displacements, and use a line plot of the resistance with a user defned x axis expression corresponding to your deflection.

You can also do it by plotting a table filled from a few derived variables, by using anual selction of columns

--
Good luck
Ivar

Resistivity change vs deflection

Thu, 14 Mar 2013 21:41:06 +0000

dear all,

How to plot the resistivity change of a simple piezoresistor vs deflection of a membrane in a MEMS sensor?

thanks