The effect of negative Poisson's ratio on the low-velocity impact response of an auxetic nanocomposite laminate beam

In this paper, an investigation on the low-velocity impact (LVI) response of a shear deformable beam laminated by carbon nanotube reinforced composite (CNTRC) layers is performed. The composite beam is auxetic due to the negative out-of-plane Poisson's ratio (NPR) through special symmetric stacking sequences of layers that are designed based on the Classical Laminate Theory. To study the effect of the out-of-plane NPR on the LVI response of the composite beam, a newly defined Hertz model is developed. The motion equations of Karman type for the CNTRC laminate beam are derived in the framework of the Reddy beam theory and solved by means of a two-step perturbation approach while the dynamic equation of the impactor is built on Newton's Law. Since temperature-dependent material properties of both carbon nanotube (CNT) and matrix are employed, the thermal influence on the LVI behavior is also investigated. Moreover, a piece-wise method is employed herein to investigate the effect of functionally graded (FG) patterns of the CNT reinforcements on the impact response. Numerical results elucidating the effects of temperature, FG distribution, and CNT volume fraction on the out-of-plane Poisson's ratio and impact response of the beam are obtained by using a Range-Kutta method and discussed in details.

Automated summary

This study investigates the low-velocity impact response of a shear deformable beam laminated by carbon nanotube reinforced composite layers, which exhibit negative out-of-plane Poisson's ratio due to special symmetric stacking sequences designed based on the Classical Laminate Theory. The newly defined Hertz model and Reddy beam theory are employed to study the effect of out-of-plane NPR on the impact response, considering temperature-dependent material properties and functionally graded patterns of CNT reinforcements. Numerical results obtained by using a Range-Kutta method elucidate the influence of temperature, FG distribution, and CNT volume fraction on the out-of-plane Poisson's ratio and impact response of the beam.