Analysis Of Structure And Mechanical Properties Of Chiral Honeycomb Material

The honeycomb material is a kind of porous material,because of it’s high specific strength and high specific rigidity,often as a buffer structure.And it has the advantages of light weight and design flexibility,in the actual production and scientific research activities should have greater application value.Chiral honeycomb structure is a new type honeycomb structure,compared with the ordinary honeycomb structure,its mechanical performance is more superior,the most special is can achieve a negative Poisson.And it also has other special performances in the field of electromagnetics,optics and other special properties.Scholars on its concern reached a new height.In particular,because of its periodicity and its dual design on dynamic characteristics and engineering characteristics of vibration isolation and noise reduction,the development prospect of chiral honeycomb structure in material field is considerable.This paper introduces the background and significance of honeycomb materials firstly,and the research status and development prospect of the chiral honeycomb structure.Taking six ligament honeycomb structure as an example,the structure of the honeycomb material is analyzed.And it is pointed out that it is composed orderly of the node ring and the ligaments connected with the node ring.Deriving successfully the expression of the Poisson’s ratio and the young’s modulus in the surface.The results not only verify the characteristics of the negative Poisson’s ratio,but also point out the related parameters that affect the Poisson’s ratio and the young’s modulus in the surface.Discussing the impact dynamic load coefficient of ligament and the critical pressure of ligament instability in the first stage of shock buffering by means of energy method and extremum analysis of functional exponential function,then get the analytical expression of the dynamic load coefficient and the critical pressure instability,and then reveal the internal micro-structural collapse mechanism and the key influencing factors of impact resistance of the chiral honeycomb material.The results show that the larger the torsion angle of the ligament node ring,which is regarded as the torsion spring,during impact compression deformation,the smaller the dynamic load coefficient of the ligament,while the pressure of instability of the ligament increases with the torsion angle of the node ring.Simulating the impact of six ligaments on the honeycomb structure based on ANSYS WORKBECH.It was found that with the increase of impact speed,the deformation mode of the six ligament honeycomb structure was transformed from "X" type deformation to the same "I" deformation as the traditional honeycomb structure.With the dynamic response curve at different speeds,the higher the speed of the six ligaments is,the better the energy absorption ability is.Designing a impact test about chiral honeycomb structure with six ligaments to investigate the performance of its impact resistance at different speeds.In this paper,the study of six ligament honeycomb structure shows that the six ligament honeycomb structure has excellent structural and mechanical properties.It can be applied to major engineering and research fields,and it is a new honeycomb structure available.