Effects of lattice stiffeners and blast load on nonlinear dynamic response and vibration of auxetic honeycomb plates

In this paper, the effects of lattice stiffeners and blast load on nonlinear dynamic response and vibration of auxetic sandwich honeycomb plates on Pasternak elastic foundations are considered. The remarkable point of this study is that the outer surfaces of the system reinforced by lattice stiffeners (including orthogonal stiffeners and oblique stiffeners) are made of functionally graded materials. Based on the analytical solution, the Reddy's FSDT, the Airy's stress functions, the Galerkin and the fourth-order Runge-Kutta methods, fundamental frequency, dynamic response and frequency-amplitude curves of the plates reinforced by lattice stiffeners under blast and mechanical loads are determined. Then, the result analyses the effect of lattice stiffeners, blast and mechanical loads, elastic foundations on nonlinear dynamic response and vibration of auxetic honeycomb plates. The optimal angle of oblique stiffeners which maximizes natural frequency and contemporaneously minimizes amplitude when changing geometrical parameters of auxetic honeycomb is also determined.

Automated summary

This paper examines the effects of lattice stiffeners and blast load on the nonlinear dynamic response and vibration of auxetic sandwich honeycomb plates on Pasternak elastic foundations. The study emphasizes the use of functionally graded materials for the outer surfaces of the system reinforced by lattice stiffeners. Analytical solutions and various methods are employed to determine the fundamental frequency, dynamic response, and frequency-amplitude curves of the plates under different loads, while also analyzing the impact of lattice stiffeners, blast and mechanical loads, and elastic foundations on the nonlinear dynamic response and vibration of auxetic honeycomb plates. The optimal angle of oblique stiffeners maximizing natural frequency and minimizing amplitude is also determined.