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Experimental Modal Analysis
Sample preparation
Glass-epoxy composite plates with dimensions 270 mm x 200 mm are fabricated for experimental modal analysis. Laminated plates with three different ply orientations: all zero plies [0/0/0/0], all 90 plies [90/90/90/90] and a cross ply laminate [0/90/0/90] are used. All the plates are prepared using unidirectional glass-epoxy mats by hand layup technique in the laboratory.
Material properties of the glass-epoxy composite laminate used in the experimental modal analysis are listed in Table 37.1.
| Table 37.1 Material properties of glass-epoxy laminate |
Composite |
Glass-epoxy |
Elastic modulus, E1 |
28.45 GPa |
Elastic modulus, E2 |
2.14 GPa |
Shear modulus, G12 |
1.032 GPa |
Poisson's ratio,  |
0.24 |
Density,  |
1670 kg/m3 |
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