Finite element analysis and mechanical properties of ultrafine grained pure Ti aneurysm clip processed by severe plastic deformation
Severe plastic deformation (SPD) has recently advanced for a main process in fabricating bulk ultrafine-grained (UFG)/nanocrystalline (NC) metallic materials.In spite of many advantages of SPD,its industrial applications are limited because the SPD processed products are too small to manufacture large structural engineering components.However,medical devices,such as aneurysm clips and dental implants,are usually small in size and require high mechanical and biological performances,e.g.stiffness,yield strength,fatigue resistance,and bio compatibility.These requirements match well with the characteristics of the SPD processed materials,therefore application to medical devices can be a good solution to overcome the size limitations of the SPD methods.Typical aneurysm clips are made of a commercial Ti-6Al-4V alloy,which has higher yield strength than CP-Ti.In this presentation,CP-Ti specimens are processed by high-pressure torsion (HPT) to enhance its mechanical properties.Tensile tests and hardness tests were performed to evaluate the mechanical properties of the HPT processed CP-Ti.Microstructure observations were also investigated.Finite element analyses were also carried out by using mechanical properties of Ti-6Al-4V and deformed CP-Ti and a geometry of the YASARGIL aneurysm clip to analyze deformation behavior when clip was opened and closed repeatedly.The CP-Ti specimen was highly strengthened with high hardness and yield stress compared to Ti-6Al-4V and has significantly refined UFG microstructures.These results indicate that SPD processed CP-Ti can be a good candidate for aneurysm clips substituted by Ti-6Al-4V.
Aneurysm clip Titanium alloy Severe Plastic Deformation Ultrafine Grained Microstructure Finite Element Method
Ho Yong Um Byung Ho Park Dong-Hyun Ahn Chong Soo Lee Jaechan Park Hyoung Seop Kim
Department of Materials Science and Engineering, POSTECH(Pohang University of Science and Technology Departments of Neurosurgery, Daegu-Gyeongbuk Cardiocerebrovascular Center, Kyungpook National Univer
国际会议
第五届亚洲微纳成形技术研讨会(AMMFT2012)暨第三届微纳成形学术委员会会议
哈尔滨
英文
54-56
2012-08-01（万方平台首次上网日期，不代表论文的发表时间）