A wind blade consists of steel chassis and composite laminae as outer surface.
I want to make bending stress on the blade. It fixed from end as cantilever.
I will put strain gauge rosette near the fixation end on the composite laminae as known to have maximum bending stress.
I want to calculate stress values from the strain readings.
Hi Ahmed,
First of all, I am not sure a rosette is the most adequate configuration for a blade. Rosettes are usually used with diaphragms. Assuming that you have some configuration of strain gauges on the blade, I woud try static calibration, that is, apply knwon forces to the blade and record the output of your Wheatstone bridge (I assume that is your electrical configuration). After calibration (which could turn out to be a tough task) the system will be ready for use.
Probably, it is useful to determine elasticity moduli of composite. For this aim you may prepare the sample of laminae (without metal chassis).
Hello Ahmed.
If you look at the rosettes, these are primarily used for measuring dual (or multi-axis) strains. It is actually a combination of commonly used strain gauges usually arranged in X-Y (90 degrees) orientation to determine the stress/strain in these two (or more) directions.
I would suggest to go for a Torsional gauge (or torsion strain gauges) which has some slanted pattern (unlike linear patterns in the commonly used strain gauges) for your applications. I believe you want to study or measure the bending of a the blade if it is rotated (bent, not the actual rotation) due to wind pressure.
Hope this will be useful to you. Best luck!
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