Design Of Rigid Tube With Bamboo Radial Structure And Its TIG Additive Manufacturing Research

Lightweight design is the focus of structural design research.It is difficult to improve the mechanical properties of structures through structural design on the premise of guaranteeing quality reduction or unchanged.As a common lightweight design element,circular tube is widely used in structural design.The study of pressure and energy absorption characteristics of circular tube is also popular,but most of them focus on the study of axial pressure and energy absorption characteristics,and the optimization design of radial load-bearing performance is less.In this paper,phyllostachys pubescens is taken as the research object.The relationship among radial material,structure and mechanical properties of phyllostachys pubescens was explored.It was found that the branched structure composed of parenchyma cells and vascular bundles had partial pressure effect in the radial section of bamboo wall,and the bamboo stiffener structure had obvious supporting effect on bamboo tube.Based on this,the branched pressure structure and the stiffener structure of the imitation bamboo wall are extracted as the design elements of the rigid pipe of the imitation bamboo radial structure.The rigid tube model of embedded hexagonal bamboo-like structure with better radial compression performance was obtained by modeling and finite element analysis.The 6mm round corner is used to optimize the local stress concentration,so that the rigid circle of the bamboo-like structure is more uniform in the radial pressure-absorbing energy absorption and the structure is more stable.Then,according to the optimized rigid tube model of bamboo-like structure,through TIG process test,it is concluded that the sample size and quality meet the design requirements when the current of adding material is 130 A,the speed of adding material is 20 cm/min and the feeding speed is0.6 m/min.Through the path planning,the method of rotating staggered additive is obtained to ensure the stability and flatness of the additive manufacturing process.Finally,through the TIG additive manufacturing,the rigid bamboo radial structure tube with 316 L as raw material was obtained.Its radial load-bearing performance test found that when the radial deformation reached 3%,its radial pressure-absorbing performance was at least 9% higher than that of a light-weight ordinary rolled round tube.Through the design,additive and performance verification of the lightweight pressure-absorbing energy-absorbing rigid tube with bamboo radial structure,it canprovide design for the design of the radial pressure-absorbing energy-absorbing element of the circular tube in the lightweight structure design of the building and automobile fields.It can guarantee the stability of bearing capacity of lightweight structure design.