Compressive Behavior Of Porous Titanium With Helical Pores

Porous titanium material with helical pores that made by sintering titaniumfiber has outstanding potential applications in biomedical field. But so far, as thecompressive behavior of the helical pore structure is not clear and the lack ofmechanical model and theory, the further application of the porous titanium materialis limited. Therefore in this paper, numerical simulation and experiment will be usedto explore the process of compressive deformation and sintering of titanium fiberring and cylindrical porous titanium material. Finally, the purpose of this paper is tobuild the theory of compressive mechanics of porous titanium material with helicalpores.The three-dimensional model is built according to the actual helical pores ofporous titanium. As the porosity is influenced by diameter of titanium fiber,diameter and screw pitch of spring, the numerical simulation is based on adjustingthe value of porosity to study the compressive mechanics. With the increase of theporosity of the porous titanium material, the mechanical properties decrease.Specifically, with the increase of titanium fiber and the decrease of diameter andscrew pitch of spring, the compressive yield stress and Young’s modulus increased.The compressive mechanical properties of porous titanium material with helicalpores are mainly influenced by porosity and relative size of sintering neck. With thethree-dimensional model of helical pores, the relationship between mechanicalproperties and porosity of porous titanium in the axial force is studied. The formulais used in fitting the results of mechanical properties of the porous titanium.Mechanical properties of porous titanium materials increase with the increase ofrelative size of sintering neck. With the pore structure fixed, the relationshipbetween mechanical properties and the relative size of sintering neck in the axialforce is fitted to a formula. The final expression of the compressive yield stress andYoung’s modulus which influenced by properties and the size of sintering neck isgiven.After sintering, the titanium fiber rings that made by titanium fiber is observedthrough scanning electron microscope.It shows that the sintering rate and the size ofsintering neck increase first and then decrease while the sintering temperature andthe holding time rises. After sintering8hours in1000℃, the porous titaniummaterial with helical pores has the most excellent mechanical properties of all. Then,the expression of the compressive yield stress and Young’s modulus will becorrected with the sintering rate. Finally, the expression of the mechanical properties of porous titanium materialwith helical pores will be given combined with all of the factors.