Influence of Fine Shot Peening on Mechanical Properties of Orthopedic Plate and Screw

Abstract:

As the bone fracture is now considered the second most serious disease in the world, a huge number of orthopedic devices for bone healing is being developed. However, there happened to be a number of incidents in which the orthopedic plates were broken inside the body due to inadequate strength. The present study aims to investigate the effects of Fine Shot Peening (FSP) conditions on performances of orthopedic plates and screws. In this research, there are 3 types of medical alloys to be studied namely SUS316 alloy, Ti6Al4V alloy and Ti6Al7Nb. In FSP process, 40 and 80 μm diameter of silica media was selected and utilized. FSP was carried out under the pressure of 0.5 MPa in Nitrogen atmosphere. The study shown that Ti6Al4V alloy with FSP media diameter of 80 μm resulted in 11% increment of bending strength and 40% increment of surface hardness. Regarding the orthopedic screw, the result shown that after applying FSP, the pull out strength from bone could be increased above 76%.

• Periodical: Key Engineering Materials (Volume 803)
• Pages: 148-152
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.803.148
• Online since: May 2019
• Authors: Goratouch Ongtrakulkij, Anak Khantachawana*
• Keywords: Bending Strength, Coefficient of Friction, Fine Shot Peening, Hardness, Othopedic Plate, Othopedic Screw, Pull-Out Force

References

[1] Johnell O and Kanis JA, An estimate of the worldwide prevalence and disability associated with osteoporotic fractures,OsteoporosInt 17:1726, (2006).

DOI: 10.1007/s00198-006-0172-4

[2] G Chen, B Schmutz, M Wullschleger, M J Pearcy, and M A Schuetz, Computational investigations of mechanical failures of internal plate fixation, Proc Inst Mech Eng H, Vol. 224, pp.119-126, (2009).

DOI: 10.1243/09544119jeim670

[3] M.A.STorres and H.J.CVoorwald, An evaluation of shot peening, residual stress and stress relaxation on the fatigue life of AISI 4340 steel, International Journal of Fatigue, Vol. 24, pp.887-886, (2002).

DOI: 10.1016/s0142-1123(01)00205-5

[4] Slobodan Mitrovic, Dragan Adamovic, Fatima Zivic, Dragan Dzunic and MarkoPantic, Friction and wear behavior of shot peened surfaces of 36CrNiMo4 and 36NiCrMo16 alloyed steels under dry and lubricated contact conditions, Applied Surface Science, Vol. 290, pp.223-232, (2014).

DOI: 10.1016/j.apsusc.2013.11.050

[5] Metal Improvement Company, Shot Peening Applications, Curtiss - Wright Corporation, USA, Ninth edition, pp.4-40, (2005).

[6] Qiang Feng, Chuanhai Jiang, Zhou Xua, Lechun Xie, and Vincent Ji, Effect of shot peening on the residual stress and microstructure of duplex stainless steel, Surface and Coatings Technology, Vol 226, PP 140-144, (2013).

DOI: 10.1016/j.surfcoat.2013.03.047