Finite Element Simulation And Experimental Study About Laser Micro-joining Between Medical Pure Ti And Biopolymer Material PET

With the advent of the aging population, the demand of healthcare equipment is growing, meanwhile, implantable medical devices and components have become the emerging key areas of the healthcare industry. As we looking to the future development of medical products, we recognize products manufactured by a single material will be greatly reduced, and the combined use of a variety of materials will become more common. Reliability, security and biocompatibility of the connection of dissimilar materials have brought great challenges to design and manufacture of medical devices. The biopolymer materials (PET) have a good biocompatibility, meanwhile, medical pure Ti (volume percentage of 99.999%) have similar elastic modulus with human bones, excellent biocompatibility and good corrosion resistance in the biological environment. The connection between the biopolymer materials and medical pure Ti is bound to get better application values. The compound of biopolymer material PET and medical pure Ti has been preliminary application in clinical research.This paper studies the connection mechanism of laser micro-joining medical pure Ti and biological macromolecule material (PET). Response surface method is used to design and optimize the experiment. Combined with numerical simulation method, research the laser micro-joining system of medical pure Ti and biological macromolecule material (PET).Firstly, based on analysis the optical properties and thermodynamic properties of the biopolymer material and metal material, respectly, proposal the welding way of make the metal placed at the top of the biopolymer which reduces the high transmittance requirements of biological polymer material. Design symmetrical clamping device for laser micro-welding which can adjust manually.Secondly, based on the weldability, design the process experiment via response surface experiment method. Establish the mathematical model of process parameters and the shear resistance and width of the weld. Optimize the mathematical model via the method of stepwise regression. Analyze the influence of various parameters on the width and shear resistance of the weld.Finally, establish the mathematical model of the laser micro-welding the medical pure Ti and biopolymers PET via ANSYS software. Then, simulate the temperature field. It is reveals the mechanism of laser micro-welding of the PET/Ti, to a certain extent.This article studied on the laser micro-joining of medical pure Ti and biological macromolecule material PET systematically, and laid the theoretical foundation for its application in the field of medical devices.