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...amined, the equationsdegree modifies with the applied load (pressure). Considering a clamped plate with constantsthickness h, undergoing uniform pressure p, thesmaximum deflection w0 can be expressed =-=[1]-=-: 3 0 662,0 Eh pR Rw s(1) Where: R is the membrane’s radius, p applied pressure,sE Young’s modulus, h membrane’s thickness, andsvalue of Poisson’s ratio equals 0.3. Experimental set-up Shadow Moiré...

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...kness, andsvalue of Poisson’s ratio equals 0.3. Experimental set-up Shadow Moiré method is a known optical methodsfor deformations analysis. Application of classicalsmethod to calculate displacements =-=[2]-=- using levelscurves can be applied successfully if the desiredsaccuracy is about 0.1 mm. Study of the thinsmembranes having large deformations isn’t enoughsaccurate by this method. If the phase shifti...

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...lly if the desiredsaccuracy is about 0.1 mm. Study of the thinsmembranes having large deformations isn’t enoughsaccurate by this method. If the phase shifting techniques is combined withsshadow Moiré =-=[3]-=- the accuracy increase 10 times (up tos0.01 mm). The principle is presented in figure 1 andsthe experimental measuring set-up in figure 2.sThe white light source projects the master gridswith a pitch ...

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...ed a small witness platesnecessary to accurate evaluation of the phase valuesbetween the shifted images. The computation wassperformed using OMBRE software developed bysUniversity of Poitiers, France =-=[4]-=-. Loading of the membrane was done with a smallspump, applied pressure being measured with ascalibrated glass tube in millimetres water column (mmsH2O). To automatically compute the membrane’s reliefs...