In this work, the dry sliding wear behaviour and friction characteristics of aluminium alloy Al6061 silicon carbide particulates (SiCp) of size 43 µm reinforced composites were evaluated through laboratory experiments. The content of SiCp in the alloy was varied from 5% to 35% in steps of 5% by weight. The metal matrix composites were manufactured using stir casting technique. A pin-on-disc wear testing machine was used to evaluate the wear rate, in which an EN-31 steel disc was used as a counter face. Results indicated that the wear rates of the composites were lower than that of the matrix alloy and further reduction in wear rate was achieved by increasing the SiCp content. The wear rate increased for an increase in the load and sliding velocity. Increase in the applied load increased the wear severity by changing the wear mechanism from abrasion to particle cracking. The observations have been explained using scanning electron microscopy analysis of the worn surfaces. The coefficient of friction was evaluated using friction forces measured from the tests. The coefficient of friction decreased for an increase in the SiCp content at low sliding velocity.
Finite Element Analysis (FEA) has been used in the field of biomedical engineering and especially in biomechanics, which helps to predict and validate feasible designs for complex cases. The role of biomechanics has grown steadily in the field of orthopedic surgery. For example, fixation was performed to stabilize a large femoral bone fragment. Femoral injury is analyzed in real time, and the experiment provides a three-dimensional visualization of finite elements designed to explain the mechanical properties of the femur. Modified trapezoidal nail shape is used in the modified intramedullary rod setup in order to obtain additional strength and stability. It also provides resistance to femoral head rotation. Potentially it improves patient mobility and recovery since the modified design is in par with the anatomy of the human femur bone.
Los componentes sinterizados fabricados con aceros inoxidables dúplex (DSS) son adecuados para aplicaciones muy diversas. Los aceros DSS son una combinación de aceros inoxidables ferríticos y austeníticos, y son ampliamente utilizados en diferentes industrias debido a sus buenas propiedades mecánicas y de resistencia a la corrosión. El uso de DSS está creciendo año tras año en la industria del automóvil y en las industrias offshore. En el presente trabajo se estudian dos aceros, DSS A y DSS B, con estructura bifásica obtenidos por vía pulvimetalúrgica. Se utilizaron dos composiciones hechas con polvos prealeados (AISI 310L y AISI 430L) junto con estabilizadores de ferrita y austenita como cromo, molibdeno y níquel. Los polvos se mezclaron en un molino durante 12 h. La sinterización de las preformas en polvo se realizó a 1350 ºC en vacío parcial y en atmósfera de hidrógeno, respectivamente. Los compactos sinterizados se sometieron a operación de forjado a 1150 ºC y se enfriaron en agua. El análisis XRD del DSS sinterizado y forjado confirmó la ausencia de intermetálicos. El comportamiento mecánico y desgaste de DSS se analizó mediante el análisis relacional de grises del método de Taguchi. El DSS B en estado forjado sometido a condiciones de carga de 20 N bajo atmósfera de hidrógeno mostró un COF de 0,53.
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