Application of multiple residual stress determination methods to coarse-grained biomedical implant castings |
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Authors: | Brian Conroy Yéli Traoré Sanjooram Paddea Joe Kelleher |
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Affiliation: | 1. School of Engineering and Bernal Institute, University of Limerick, Limerick, Ireland;2. The Open University, Milton Keynes, UK;3. ISIS Neutron Source, STFC, Rutherford-Appleton Laboratory, Didcot, UK |
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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. |
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Keywords: | Neutron diffraction X-ray diffraction contour method centre-hole drilling nano-indentation residual stress shot-peening shot-blasting CoCrMo ASTM F75 femoral knee implants biomedical implants investment casting |
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