Failure analysis in 316L stainless steel supracondylar blade plate |
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| Affiliation: | 1. Institute of Thermal Power Engineering, Cracow University of Technology, Al. Jana Pawła II 37, 31–864 Kraków, Poland;2. Instytut Metalurgii Żelaza, ul. K. Miarki 12–14, 44–100 Gliwice, Poland;1. Department of Orthopaedic Surgery, Chang Gung Memorial Hospital, Taoyuan, Taiwan; College of Medicine, Chang Gung University, Taoyuan, Taiwan;2. Graduate Institute of Clinical Medicine, Chang Gung University, Taoyuan, Taiwan;1. Bialystok University of Technology, Faculty of Mechanical Engineering, Poland;2. Regional Hospital of J. Sniadecki, Bialystok, Poland;3. Warsaw University of Technology, Faculty of Materials Science, Poland;1. Department of Orthopaedic Surgery, University of Toledo College of Medicine, 3000 Arlington Avenue, Toledo, OH 43614, United States;2. Department of Physiology and Pharmacology, University of Toledo College of Medicine, 3000 Arlington Avenue, Toledo, OH 43614, United States;3. Center for Diabetes and Endocrine Research, University of Toledo College of Medicine, 3000 Arlington Avenue, Toledo, OH 43614, United States;1. Department of Materials Science and Engineering, University of North Texas, Denton, TX 76207, United States;2. School of Mechanical Engineering, University of Campinas, Campinas, Brazil;3. School of Applied Science, University of Campinas, Limeira, Brazil;4. Department of Mechanical Engineering, Cleveland State University, Cleveland, OH 44115, United States;5. CSIRO Manufacturing, Clayton South, Clayton, Australia |
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| Abstract: | A 316L stainless steel blade plate implant used for fixation of a femoral fracture in a female patient failed catastrophically at four months of service. The failure examination included visual inspection, chemical analysis, metallography, hardness testing, as well as macroscopic observations using scanning electron microscope with EDS (energy-dispersive X-ray spectroscopy). The visual inspection and X-ray radiography images exhibited that there was heterogeneous bone callus formation and the fixation screws showed surface damage by fretting wear. On the other hand, SEM results showed evidence of fatigue based on the characteristics of the fracture surfaces. It was observed that the particular high curvature femur of the patient resulted in high tensile stress between bone and screws threads. It promoted rapid losing of primary fixation and subsequently generated a high stress concentration in the plate at cantilever which resulted in premature failure by fatigue. |
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