Cross-ply composite plates

First four modes considered for comparison are first bending (B1), second bending in longitudinal direction (B2), second bending in transverse direction (B02) and first torsion mode (T1). The mode shape of B02 mode is shown below in Figure 40.1.

Figure 40.1: B02 mode shape

FRF plots for cross-ply composite plates

Frequency response plots of healthy cross ply laminate are shown in Figures 40.2(a) and (b) for a frequency range of 0-800 and 800-2000 Hz respectively.

Figure 40.1 (a) Frequency response plot from 0-800 Hz for the healthy
composite plate with 0⁰ / 90⁰ cross plies

Figure 40.2 (b) Frequency response plot from 800-2000 Hz for the healthy
composite plate with 0⁰/90⁰ cross plies