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Influence of Biochemical Environments on Surface Fatigue of Additive Manufactured Ti-6Al-4V

Riaz, Muhammad Qasim
http://rave.ohiolink.edu/etdc/view?acc_num=ysu1485534165584066

Abstract Details

2016, Master of Science in Engineering, Youngstown State University, Department of Mechanical, Industrial and Manufacturing Engineering.
Unstable joint lubrication has been identified as a critical factor initiating the wear and corrosion that significantly limits the useful life of joint replacements. It occurs when the healthy synovial fluid is degraded by surgical wound healing and adverse physiological reaction of surrounding tissue against wear and corrosion products of implant materials. It is critical to know mechanical properties of the degraded unhealthy joint fluid to understand the joint implant lubrication. While a large number of studies have been undertaken to characterize the wear and corrosion behavior of artificial joints, the direct influence of biochemical conditions of synovial fluid on joint lubrication and implant surface damage mechanism are still not clearly understood. Titanium alloys are widely used for implant materials in the medical and dental fields because of their superior strength-to-weight ratio, greater ductility, and electrochemical stability compared to other metallic materials. Therefore, the objective is to identify the surface tension and viscosity evolution of unhealthy synovial fluid and implant surface fatigue wear responses. This master’s thesis describes the mechanical property analysis of additive manufactured Ti-6Al-4V samples based on their build orientation and also their mechanical wear analysis in different biochemical environments. In order to achieve this two samples of Ti-6Al-4V were additive manufactured in transversely isotropic and anisotropic surfaces using electron beam melting (EBM). Nanoindentation and microbending tests were performed to iv determine their mechanical properties. The results showed higher modulus and hardness values for vertically oriented transversely isotropic sample. Three synovial fluids were then prepared using different concentrations of bovine serum albumin (BSA) and chondroitin sulfate in phosphate buffered saline (PBS). A novel nanoindentation scheme in wet condition was employed to characterize properties of synovial fluids including surface tension and viscosity. The surface tension was observed to decrease and the viscosity to increase with the increase in BSA and chondroitin sulfate. Standard pin on disk tests were conducted on both the Ti-6Al-4V samples in dry conditions and the three synovial fluid mediums. The results were analyzed by measuring the wear using optical profilometry. The results showed the highest wear for dry conditions and the lowest for the synovial fluid with highest concentration of BSA in PBS, with the vertically aligned transversely isotropic sample giving overall lesser wear than the lateral anisotropic sample. Also it was observed that increase in viscosity and decrease in surface tension resulted in lesser wear and better lubrication.
Jae Joong Ryu, PhD (Advisor)
Virgil Solomon, PhD (Committee Member)
Kyosung Choo, PhD (Committee Member)
143 p.
Biochemistry; Materials Science; Mechanical Engineering
additive manufactured titanium alloys

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Citations

  • Riaz, M. Q. (2016). Influence of Biochemical Environments on Surface Fatigue of Additive Manufactured Ti-6Al-4V [Master's thesis, Youngstown State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1485534165584066

    APA Style (7th edition)

  • Riaz, Muhammad Qasim. Influence of Biochemical Environments on Surface Fatigue of Additive Manufactured Ti-6Al-4V. 2016. Youngstown State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ysu1485534165584066.

    MLA Style (8th edition)

  • Riaz, Muhammad Qasim. "Influence of Biochemical Environments on Surface Fatigue of Additive Manufactured Ti-6Al-4V." Master's thesis, Youngstown State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1485534165584066

    Chicago Manual of Style (17th edition)

ysu1485534165584066
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© 2016, all rights reserved.
This open access ETD is published by Youngstown State University and OhioLINK.