Mechanical Property Relationship Of TPMS Structures Under Additive Manufacturing

Porous structure is a kind of structure with light weight and high energy absorption characteristics.It is generally composed of truss or holes.It is a candidate structure form for potential energy absorption,vibration reduction and structural members requiring high strength and specific stiffness.Among many kinds of porous structures,three period minimal surface(TPMS)has attracted much attention in the fields of materials engineering and civil engineering due to its new,complex and symmetrical topology.Different from the traditional honeycomb or grid porous structure,TPMS structure is composed of continuous and smooth curved surface,with large surface area and continuous internal channels,which causes less stress concentration.In recent years,with the development of additive manufacturing technology(AM),it provides technical conditions for complex TPMS structure.Various TPMS structural specimens can be prepared by additive manufacturing technology,and their mechanical properties can be studied and analyzed.Therefore,in this paper,two kinds of TPMS wall thickness structures are manufactured by additive manufacturing technology:TPMS homogeneous wall thickness structure and TPMS gradual wall thickness structure.The mechanical properties of two kinds of TPMS wall thickness structures were studied by quasi-static compression experiments.The experimental results show that TPMS gradual wall thickness structure has more significant energy absorption capacity than TPMS homogeneous wall thickness structure,which is an ideal energy absorption structure.Then,in order to improve the disadvantage of low initial peak force of TPMS tapered wall thickness structure,the parametric design of TPMS tapered wall thickness structure is carried out,and a new TPMS tapered wall thickness optimization structure is proposed.The results show that the new TPMS optimized structure not only improves the disadvantage of low initial peak force of conventional TPMS gradual wall thickness structure,but also retains the advantages of strong energy absorption ability,which is a kind of TPMS gradual wall thickness structure with better mechanical properties.Finally,the dynamic mechanical properties of TPMS structure are studied.The results show that the dynamic deformation mode of TPMS structure is similar to the quasi-static deformation mode under low velocity impact load.In this paper,the quasi-static mechanical properties and dynamic mechanical properties of TPMS structure are tested,and the mechanical properties of two kinds of TPMS structure are obtained.Based on the original TPMS structure,a new type of TPMS structure with higher energy absorption capacity is designed,which provides the basis for the optimization design of TPMS structure and the study of impact resistance.