Stress state characterization of ductile materials during scratch abrasion

Abrasive wear limits the lifetime of many machine components. Most empirical models relate abrasive resistance to material hardness. In reality, however, other properties are also influencing as scratch abrasion damage follows from a highly complex stress trajectory upon scratching. Numerical (finite element) simulation requires use model, which translates this into degradation and removal. include first two invariants. However, fully incorporating trajectories that occur during may require with dependence third deviatoric parameter (Lode angle). This paper serves an a-priori study evaluate states abrasion. Three mechanisms (ploughing, wedging, cutting) considered. Hereto, results extensive parametric using elastic-plastic finite element simulations indentation process discussed. Complex, non-proportional variations in state values observed Distinct identified for three abovementioned mechanisms. These critically discussed motivate selection suitable rigorous analysis processes associated • Stress investigation abrasion; ploughing, wedging & cutting. Abrasion imposes triaxiality Lode angle. Damage is predicted at levels lower than ?0.33. 3D nature causes angle differ zero. Requirements continuum model presented.