Obtaining the predicted number of cycles of femoral prosthesis manufactured with ASTM F138 and ASTM F75 aloys, applying the method of finite element.

Abstract

This study aims to calculate the predictive number of cycles applied to femoral prostheses made with ASTM F138 and ASTM F75 alloys. A hip prosthesis is typically subjected to cyclic loads commensurate with the patient’s weight in response to each step and hence requires a cyclic compression stress approach. Austenitic stainless steels have been used in surgical applications over many years due to low cost, good mechanical properties and resistance to corrosion. The CrCoMo alloy features higher corrosion resistance compared to ASTM F138 stainless steel. In order to perform finite element analysis, two software were used: Autodesk® Inventor® 2013 and Autodesk® Simulation 2015. The formatting of the simulation followed the parameters established in the ISO 7206-4: 2016 ABNT NBR standard, the applied load was 2,3 kN with an angle of 10 degrees with respect to the frontal plane and 9 degrees with respect to the lateral plane. As for the static analysis, the prosthesis composed of ASTM F138 material presented satisfactory results, and the prosthesis made with the ASTM F75 alloy failed. Both prostheses did not exceed 5 million cycles in the dynamic load application.