Study On Impact Dynamics Of A New Auxetic Honeycomb Structure

Due to the good physical properties and excellent mechanical ability,auxetic structure are widely used in the fields of biomedicine,automotive,marine and aerospace,etc.With the deepening of the research on the negative Poisson's ratio structure,the honeycomb structure with negative Poisson's ratio effect has also entered the exploration of the researcher.Because the negative Poisson's ratio honeycomb structure has a good impact resistance,it has become a new hot spot research of people.According to the relationship between the deformation mechanism and the energy absorption characteristics of the negative Poisson's ratio honeycomb structure,this paper increases the deformation mechanism of the structure based on the traditional concave Poisson's ratio honeycomb structure,and designs a concave type plus rotation.The negative Poisson's ratio honeycomb structure.The in-plane impact resistance of negative Poisson's ratio honeycomb structures was studied by experiments and finite element simulations.The main works include:(1)On the basis of the traditional concave negative Poisson ratio honeycomb structure,a negative Poisson's ratio honeycomb structure with a concave type and a rotation type is designed.Using the 3D printing technology to design and print out the new and traditional concave type two negative Poisson ratio honeycomb structure model.(2)The dynamic impact test of two kinds of die honeycomb structure models was studied,and the influence of different impact velocity on the deformation modes,dynamic response and in-plane energy absorption characteristics of the two models was studied.The in-plane impact energy absorption effects of the two structures at different speeds were compared,and the deformation modes and dynamic response behaviors of the two honeycomb structures under impact were further discussed.The energy absorption effects of the two models were analyzed.(3)Using ANSYS/LS-DYNA software to simulate the dynamic impact of two structural models at different speeds,obtain their deformation modes and dynamic response,and compare the finite element values with the experimental results to reveal the two models' suction.The link between effect and deformation mode.(4)On the basis of the newly designed negative Poisson honeycomb structure,the structural model is optimized and the influence of the structure size on the deformation mode,dynamic response and energy absorption effect is discussed.The results of the study show that the structural model of this paper shows better energy absorption than the traditional concave negative Poisson ratio honeycomb structure.The structure after optimized design has stronger impact resistance characteristics than the former two structures at medium and high speeds.In summary,the model of this paper shows good impact resistance characteristics,and proposes a new idea for the design and application of energy-absorbing structures.