A new modified expanding cavity model for characterizing the spherical indentation behavior of bulk metallic glass with pile-up

Spherical nanoindentation tests were performed on Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass and pile-ups were observed around the indenter. A new modified expanding cavity model was developed to characterize the indentation deformation behavior of strain-hardening and pressure-dependent materials. By using this model, the representative stress–strain response of this bulk metallic glass to hardness and indentation in the elastic–plastic regime were obtained taking into consideration the effect of pile-up.