Experimental validations of elastic to plastic asperity-based models using normal indentations of rough surfaces

▶ Contact stiffness of metallic rough surfaces is measured. ▶ Three metallic matrials with 2 roughness are tested. ▶ Sevaral elastic to plastic asperity-based models are evaluated. ▶ Microgeometry is the first order parameter in the contact stiffness. ▶ The material properties (elastic and plastic domains) are second order parameters.