Abstract
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.
Highlights
The natural frequency of traditional fiber-reinforced composite laminates is determined under certain structural size and boundary conditions that directly affect vibration and sound radiation.When the external excitation frequency is the same as or close to the natural frequency of the composite laminate structure, there will be resonance in the composite laminates, and the noise will be larger
To the constraints of supported edges, the composite laminates with two-phase fibers were subjected to small free vibration under thermal loads
The in-plane stress of the laminates was caused by the thermal stress that was produced by the graphite and epoxy resin matrix and the recovery stress that was produced by nitinol
Summary
The natural frequency of traditional fiber-reinforced composite laminates is determined under certain structural size and boundary conditions that directly affect vibration and sound radiation. By adding a shape memory alloy (SMA) and graphite-embedded material to the substrate, the natural frequency can be adjusted without modifying the original shape dimensions and boundary conditions of the laminates Such modification avoids structural resonance and reduces structural vibration and noise. The influence of nitinol/graphite fibers nitinol/graphite on the free vibrationwas behavior of orthogonal laminates was oninfluence the free of vibration behaviorfibers of orthogonal laminates investigated by varying the gradient investigated by varying the gradient distribution, pre‐strain, fiber volume fraction, and structural distribution, pre-strain, fiber volume fraction, and structural size parameters with temperature.
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