Energy Absorption And Vibration Isolation Characteristics Of Honeycomb Structures With Negative Stiffness Beams

Honeycomb structures have the characteristics of light weight,high compressive strength,and high energy absorption capacity,which are widely used in energy absorption,protection,and other fields.However,the energy absorption of traditional honeycomb structures is mainly based on the plastic deformation and fracture behavior of materials and structures,which leads to the non-reusable of honeycomb structures and the waste of resources and costs.Based on this,a kind of honeycomb structures with negative stiffness beams was designed in this paper,which have recoverable deformation,and its mechanical properties and energy absorption characteristics were studied.Honeycomb structures with negative stiffness beams,meanwhile,also shows its own advantages in vibration isolation.Therefore,based on the research of negative stiffness honeycomb structures,a kind of honeycomb structures of numerous unit cells with quasi-zero stiffness property has been designed and researched in this paper,and studies its vibration isolation performance,to provide theoretical support and technical guidance for the application of honeycomb structures with negative stiffness beams in the field of repeatable energy absorption and vibration isolation.Firstly,the mechanical properties of the proposed negative stiffness beams and quasi-zero stiffness beams are studied theoretically,the theoretical expressions of the parameters such as the critical load and the critical displacement of the steady-state transition of the element structures are derived,and the influence of the structural parameters on the mechanical properties of the element structures are analyzed.The finite element simulation method is used to analyze and verify the mechanical properties of the proposed element structures.The results show that the deduced theoretical expression of the mechanical properties of the proposed element structures can accurately reflect the mechanical response process of negative stiffness beams and quasi-zero stiffness beams element structures.Based on the study of mechanical properties of the unit structures,the two-dimensional and three-dimensional honeycomb structures with negative stiffness beams with ordered arrangement are designed.The energy absorption characteristics of the ordered multi cell cellular structures with negative stiffness beams are studied by finite element simulation and experimental verification.The influence of structural parameters on energy absorption is analyzed and compared with the traditional honeycomb structures.The results show that with the increase of the number of layers of the honeycomb structures with negative stiffness beams,the energy absorption efficiency increases.With the increase of the inclined beams angle,the energy absorption per unit mass increases first and then decreases,while the energy absorption per unit volume decreases.The structures have good energy absorption capacity and can achieve repeatable deformation and repeatable energy absorption.Based on the research of the structures with negative stiffness beams,a kind of honeycomb structures of numerous unit cells with quasi-zero stiffness property has been proposed.Combined with finite element simulation and experimental verification,the mechanical properties and vibration isolation characteristics of honeycomb structures with quasi-zero stiffness beams are studied,and the influence of structural parameters,boundary constraints,loading rate,damping coefficient and other factors on vibration isolation performance are analyzed.The results show that compared with the traditional linear vibration isolators,the honeycomb structures of numerous unit cells with quasi-zero stiffness property has a larger effective vibration isolation range and lower transmission rate,which can exhibit excellent vibration isolation performance and achieve better vibration isolation effect.The results of this paper show that the honeycomb structures with negative stiffness beams can achieve excellent repeatable energy absorption and vibration isolation performance.Through the reasonable design of the unit and the whole structures,it is expected to be widely used in the fields of energy absorption,microstructures vibration isolation protection,metamaterials,medical devices and so on.