ABSTRACT
ASTM F75 femoral knee implant components distort during manufacture due to residual stress re-distribution or inducement. X-ray diffraction, neutron diffraction, centre-hole drilling and the contour method residual stress determination techniques were applied to as-cast and/or shot-blasted components. The centre-hole drilling and contour methods can only be considered qualitative as a result of uncertainty associated with the elastic anisotropy of gauge volumes. Additionally, neutron diffraction experimentation returned unfeasible results. However, it was qualitatively identified that a shot-blasting shell-removal process has the ability to significantly alter the bulk residual stress state of the implants and induce a stress state which would cause distortion by re-distribution following material removal during manufacturing processes.
Acknowledgements
The authors would also like to acknowledge the following personnel, universities and companies for conducting residual stress determination measurements and/or providing technical consultation: Dr Mike Woodard and Mr Yoshi Teramoto at Pulstec Industrial Co. Ltd., 7000-35, Nakagawa, Hosoe-cho, Kita-ku, Hamamatsu-City, Shizuoka Pref., 431-1304, Japan. Dr Xavier Ficquet and Dr Ed Kingston at Veqter Ltd., Unit 8 Unicorn Business Park, Whitby Road, Brislington, Bristol, BS4 4EX, UK. Dr Mike Prime, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. Dr Gary Schajer, The University of British Columbia, Department of Mechanical Engineering, Vancouver Campus, 2054-6250 Applied Science Lane, Vancouver, BC Canada V6T 1Z4.
Disclosure statement
No potential conflict of interest was reported by the authors.
ORCID
Sanjooram Paddea http://orcid.org/0000-0001-5981-3987
David Tanner http://orcid.org/0000-0002-6945-2000