Material point simulations as a basis for determining Johnson–Cook hardening parameters via instrumented scratch tests

Scratch tests are a powerful and inexpensive tool for studying the mechanical properties of materials. The typically applied determining deformation behavior materials serves as quality assessment method measuring adhesion delamination coatings. However, extraction quantitative material parameters using scratch remains highly non-trivial and, contrary to instrumented indentation or tensile testing, limited number procedures available so far hardening Such enormous relevance, since they allow non-destructive determination constitutive models commonly used in computer simulations thin films, coatings, surface changes due loading. In this work we rely on extensive computational meshless Material Point Method finding relationships between forces, topography, parameters. performed two large groups metals with Young’s moduli corresponding steel copper. Within each group, yield stresses varied order cover widest possible range behaviors. results show that topography narrow down value stress, which can be alternatively determined indentation. Once stress is known, parameter unequivocally fixed exponent via single scratch, forces scratches, provided done at different normal loads.