Modal Performance of Two-Fiber Orthogonal Gradient Composite Laminates Embedded with SMA.

A gradient composite laminate that was composed of two‑phase fibers, a shape memory alloy (SMA), and graphite was prepared to investigate modal performance and improve vibration behavior. The stress‑strain relation of the single‑layer composite plates was derived from Kirchhoff thin plate theory and the material constitutive of the SMA. A gradient distribution model and the eigenvalue equations of gradient composite laminates were developed. The influence of the fiber component content gradient distribution, pre‑strain, the two‑phase fiber volume fraction, and geometric parameters on the modal performance was analyzed. This study provides a method to avoid the structural resonance of composite laminates that are embedded with an SMA through the gradient distribution of two‑phase fiber content that leads to the interaction of the material properties.