# Calculations for strain gages in rosette setup

Joacim Rådstam

Posted on 13.12.2010 12:09
How are the output channels of the Rosette-function defined? That is, how are the Diam, Rayon, Eps and Angle calculated? Can't find any information on this in the available documentation. Any help is very much appreciated.
Latin America Regional Manager
Posted on 13.12.2010 13:11
Output channels are defined like this: Diam: is the center point of the Mohr's circle (average of inputs) Rayon: is the radius of the Mohr's circle Angle: is the angle of maximum strain EpsMax: Diam+Rayon EpsMin: Diam-Rayon
Joacim Rådstam

Posted on 13.12.2010 14:35
Thank you. That made things clearer.
angel martin

Posted on 04.04.2013 18:09
Hello, I have two doubt about rossettes. Fist, the values of strain (EpsMax and EpsMin), are based on strains measured for each rossette' gauge, corrected by the transverse sensitivity or not Second, it is posible to see the ecuations that are used in the calculation. Regards.
Dewesoft Developer

Posted on 05.04.2013 06:42
Here are all equations... 45: Diam = (EpsA + EpsC) / 2 Rayon = 1/sqrt(2) * sqrt((EpsA - EpsB)^2 + (EpsB - EpsC)^2) EpsMax = DataDiam + DataRayon EpsMin = DataDiam - DataRayon Angle(rad) = 1/2 * ArcTan( (2*EpsB - EpsA - EpsC) / (EpsA - EpsC) ) 60: Diam = (EpsA + EpsB + EpsC) / 3 Rayon = sqrt(2)/3 * sqrt( (EpsA - EpsB)^2 + (EpsB - EpsC)^2 + (EpsA - EpsC)^2 ) EpsMax = DataDiam + DataRayon EpsMin = DataDiam - DataRayon Angle(Rad) = 1/2 * ArcTan( (sqrt(3) * (EpsB - EpsC)) / (2* EpsA - EpsB - EpsC) ) 120: Diam = (EpsA + EpsB + EpsC) / 3 Rayon = sqrt(2)/3 * sqrt( (EpsA - EpsB)^2 + (EpsB - EpsC)^2 + (EpsA - EpsC)^2 ) EpsMax = DataDiam + DataRayon EpsMin = DataDiam - DataRayon Angle(Rad) = 1/2 * ArcTan( (sqrt(3) * (EpsB - EpsC)) / (2*EpsA - EpsB - EpsC) )