The Mechanical Properties Analysis Of Three Types Negative Poisson's Ratio Honeycomb Structures In Space Deployment

The concept of a space development agency was first proposed by NASA in the 1960 s.It is a new type of structural system that has been continuously developed along with the birth of science and technology.The main components include a low-ranking movable mechanism? drive components and controller composition.In China,there are many researches on the strength and stiffness of the reed-type unfolding structure in the unfolding mechanism of space.This paper has the advantages of light weight,high strength,etc.from the negative Poisson's ratio,and the use of the space-developing mechanism.The starting point is to study the unfolding and driving performance of the structure under the condition of satisfying structural stress constraints,so as to improve the usability,reliability,and stability of the spatial unfolded structure and provide a basis for further lightweight design of the spatial unfolded structure.This paper mainly studies the application of three types negative Poisson ratio honeycomb structures :sinusoidal negative Poisson ratio honeycomb structures,star-shaped Poisson's ratio honeycomb structures,and arrow-shaped Poisson's ratio honeycomb structures.Using the SolidWorks and ABAQUS to simulate the forward and reverse folding bending process of the spatial deployment mechanism.The superiority of the model is evaluated by indicators such as steady-state bending moment,critical bending moment and strain energy.The main research content includes the following aspects: 1.Analyse the tape springs in theoretics The finite element model of tape springs was established.Compared the result of the theoretical analysis and finite element simulation of the tape springs structure.2.The use of sinusoidal negative Poisson ratio honeycomb structures,star-shaped Poisson's ratio honeycomb structures,and arrow-shaped Poisson's ratio honeycomb structures was explored in the space deployment mechanism by comparing three honeycomb structure cylinders.The steady bending moment,critical bending moment,and strain energy of the shell in the forward and reverse bending bending process are compared with the corresponding values of the tape springs.The results show that compared with other negative Poisson's ratio honeycomb structures,The sinusoidal negative Poisson ratio honeycomb structures are superior in mechanical properties and can achieve the performance of tape springs with lighter mass.3.By changing the thickness of the model,finite element models with different structures are established.The results show that with the increase of thickness,the steady-state bending moment of the model also increases correspondingly,which is similar to the growth of the exponential function.By changing the radius of the cross section,finite element models of different structures are established.The finite element analysis results show that with increasing radius,the steady-state bending moment also increases correspondingly.The change of critical bending moment is independent of the radius.When the arrow-shaped honeycomb structure increases from 35 mm to 40 mm,the bending moment changes compared to other The model change is larger because there are only 3 groups of honeycomb structures at 35 mm,and at 40 mm,the number of honeycomb structures becomes 4 groups,making the performance of the structure enhanced.4.The negative Poisson's ratio cellular structure fluctuates in the vicinity of the central region during the forward folding bending process,resulting in a sudden change in bending moment,which is not the case in the reverse folding process.