Stress distribution analysis on semi constrained elbow prosthesis during flexion and extension motion

Total elbow arthroplasty can be the best decision for those patients that has advance elbow dysfunction, regarding to relive the pain and restore the normal physiological function. As it is reported in literature most complication for linked prosthesis is loosening and mechanical failure. during of this study stress distribution of total elbow replacement in three different flexion angle during both flexion and extension motion was analyzed. According to results most stress concentration accrued near the articulation surface and pin. maximum stress was happened in 90 degree of flexion in both flexion and extension motion. This study was validated using experimental results which are reported in previous study

Cyclically strained grade 800 and 1200 steel tube materials

Application of high tensile steel in various structural forms such as rolled or fabricated sections is currently increasing due its mechanical and economic advantages. Experimental investigations show the distinct plastic behavior of high tensile steel with grades greater than 700 MPa damaged under reversed tension-compression loading scenarios compared to the hardening performance of lower grades of steel. This paper investigates a combined nonlinear plastic model to predict the stress-strain equations of grades 800 and 1200 steel extracted from circular tubes under very low cycle structural damage. In the numerical modelling phase, relevant parameters are calibrated and model is verified against hysteretic experimental results. The numerical results provide a simulation tool for structures consisting of high tensile steel tubes under seismic loads