Simulação computacional de indentações isoladas e superpostas em aço de baixo teor de carbono

Abstract

Friction and wear losses have great impact on global economy and their reduction would bring great economic results. Abrasion is the main cause of wear failures, being responsible for a half of them. Abrasive wear can be defined by superposition of grooves and/or indentations. Therefore, this study proposes to develop a finite element computational model, using ABAQUS® package, to study indentation superposition. The model consists of a sample of low carbon steel which is indented five times in line. The distance between impressions was changed, covering superposition levels from -100% to 90%. The effect of these levels on resulting stress and strain fields were analyzed, as well as the maximum loading force per indentation behavior. Stress fields reached higher values just under the last two or three indentations. Another result shows that equivalent plastic strain increases with the addition of new impressions. On the other hand, the maximum loading force, depending on superposition level and amount of indentations, increases or decreases.