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Stress and strain tensors give RMS values?
Posted Jul 1, 2014, 9:05 p.m. EDT Parameters, Variables, & Functions 1 Reply
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Hi all,
I have a quick question about the stress and strain tensors in COMSOL. I have run a frequency domain study, so I have a load that is sinusoidal in time pushing on an object. I get values for the components of the stress and strain tensors from the structural mechanics module.
My question is: are these values for the stress and strain components taken as RMS values from the sinusoidal motion? Or are they taken from maximum displacement, etc.?
Thanks!
I have a quick question about the stress and strain tensors in COMSOL. I have run a frequency domain study, so I have a load that is sinusoidal in time pushing on an object. I get values for the components of the stress and strain tensors from the structural mechanics module.
My question is: are these values for the stress and strain components taken as RMS values from the sinusoidal motion? Or are they taken from maximum displacement, etc.?
Thanks!
1 Reply Last Post Jul 2, 2014, 4:20 a.m. EDT
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Posted:
1 decade ago
Hi,
The results from a frequency domain analysis are complex valued, so that they contain phase information. What you see is as a default the real part of the quantity. You can for example try plotting solid.sx, real(solid.sx), imag(solid.sx), abs(solid.sx), and arg(solid.sx) to explore this.
Note that the phase angle at which the results are presented can be changed in the settings for the data set, using the field 'Solution at angle'. The value used in the expressions above is actually solid.sx*e^(i*phase), where the default value for 'phase' is zero, unless changed in the data set.
Regards,
Henrik
The results from a frequency domain analysis are complex valued, so that they contain phase information. What you see is as a default the real part of the quantity. You can for example try plotting solid.sx, real(solid.sx), imag(solid.sx), abs(solid.sx), and arg(solid.sx) to explore this.
Note that the phase angle at which the results are presented can be changed in the settings for the data set, using the field 'Solution at angle'. The value used in the expressions above is actually solid.sx*e^(i*phase), where the default value for 'phase' is zero, unless changed in the data set.
Regards,
Henrik