Identification of material properties of sandwich structure with piezoelectric patches

Identification of material properties of sandwich structure with piezoelectric patches

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The work focuses on light-weight sandwich structures made of carbon-epoxy skins and foam core which have unique bending stiffness compared to conventional materials.The skins are manufactured by vacuum autoclave technology from unidirectional prepregs and the sandwich is then glued together.The resulting material properties of the structure usually differ from those provided by manufacturer or even those obtained from experimental tests on bolia outlet gent separate materials, which makes computational models unreliable.

Therefore, the properties are identified using the combination of experimental analysis of the sandwich with attached piezoelectric transducer and corresponding static and modal finite element analyses.Simple mathematical optimization with repetitive finite element solution is used.The model is then verified by transient analysis when the piezoelectric patch diamond painting strand en zee is excited by harmonic signals covering the first two eigen-frequencies and the induced oscillations are measured by laser sensor.