Need for a coefficient of fish using deformation measurement gage (wheatstone)

Hello

I'm building this interface labview eventualy do strain meter measures on composite samples. I tested what I've done so far in half-bridge config. and so far so good. I read about the need for my wages on the material in half or full-bridge ( http://www.ni.com/white-paper/4172/en/#toc1 ). My question:

LabVIEW should a ratio value (s) accurate material fish when you use DAQmx (one of the "Measurer of strain information" requested as input for DAQmx) to get good accurate values of strain?

(1) in other words, if I use 2 measurers (half-bridge: one in the axial direction of the sample, one at 90 ° from the axial direction on the sample), Labview DAQmx will not use the "ends of balance (accuracy/temperature/offset) of the half/full-wheatstone-bridge-config with only a. relevant fish worth?

(2) If Yes: This means that I must first find coefficient of fish of the material for each type of material (composite). So, what would be the best way to put my wages (half of the full bridge) on the material to know an "accurate experimental value" coefficient of fish without having? (looks like using bending modes are the only way)

(please consider http://www.ni.com/white-paper/4172/en/#toc1 as a reference)

TY,

Daniel

Strain_Life,

From what I could dig up, LabVIEW will not calculate a coefficient of specific real fish since it is purely an entry and uses only this entry for v.f..  Half and full bridge configurations are only for the "purposes of balance." This limits you to calulating your own fish for the composite ratio, which, at best, would be a way of the materials that you use.  This is a pretty good site for known values of the coefficients of fish from: http://www.engineeringtoolbox.com/poissons-ratio-d_1224.html

Tags: NI Hardware

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