Design And 3D Additive Manufacturing Of Energy Absorbing Helmet Based On Minimal Curved Surface Composite Structure

The helmet is a protective equipment that is used to protect the head from collision and other physical damage,thereby reducing the injury rate caused by head injury.The key to the design of the helmet is its inner lining because it can effectively reduce the degree of damage to the head when the stress is reduced.In recent years,professionals in the manufacturing field have studied and designed more complex innovative porous structures such as honeycomb structures.The honeycomb structure is a periodic repetitive structure.When it is collided with external forces,the energy generated during the stress can be effectively reduced,thereby improving the mechanical properties and pressure resistance of the helmet,thereby better protecting the head from damage to the head.As a new special porous structure for lightweight and multifunctional structure applications,the minimal curved surface has been interested in many scholars’ research in recent years,especially Diamond,Gyroid,and Primitive.This topic uses Laser CICF(SLA)technology to prepare the lining of the helmet.First of all,the Rhinoceros and Grasshopper plug-in are designed with a very small curved unit structure and porous structure.The Hyper Mesh is processed before,and the ABAQUS finite element analysis software is introduced to analyze its deformation behavior,mechanical performance and energy absorption characteristics.Secondly,the structural design design of the very small curved composite structure helmet in the structure design with high-quality performance and high energy absorption efficiency is selected.Impact simulation.The research content and conclusions are as follows:(1)Use the Rhino Ceros three-dimensional modeling software and the Grasshopper plug-in to design three different small curved unit structure models and porous structural models.(2)Use the material mechanical performance of the material of the material test machine to test the material ABS,and analyze the impact of SLA printed squares on the actual performance of the model when the model is actual.The material is used to make three different small curved porous structures.(3)Through the compression simulation and mechanics test of the structure of the three different small curved structure units and the porous structure,it is found that the pressure resistance strength of Diamond and Primitive structures is weak and easy to damage.Strong,not easy to destroy.Therefore,the Gyroid structure is selected to design the helmet lining of the small curved composite structure.(4)Establish an impact simulation model in accordance with the requirements of the national helmet test standard GB/T 2812-2006,and conduct a hammer experimental simulation on the inner lining of the very small curved helmets designed with the Gyroid structure The curve found that the thick-curved composite structure helmet with a thickness of 0.5mm has good mechanical properties and excellent energy absorption characteristics.Finally,SLS technology uses the lining of the helmet with optimized dot structure.Comprehensive analysis shows that different types of TPMS structures show different deformation behaviors and mechanical responses during the compression process.This structure can be used to resist the application of impact vehicles or implants.