Direct calibration of indenter tip geometry by optical surface topography measuring instruments

Abstract Instrumented indentation test (IIT) is a depth-sensing hardness allowing nano- to macro-mechanical characterisation of surface mechanical properties. Indenter tip geometry calibration allows nano-scale characterisation, overcoming the limits conventional tests. Calibration critical ensure IIT traceability and applicability for quality verification in manufacturing processes. The accuracy precision are mainly affected by indenter calibration. State-of-the-art reports either direct AFM, which highly expensive unpractical industry, or indirect methods, less accurate, precise robust. This work proposes practical, method optical topography measuring instruments. methodology complemented uncertainty evaluation. proposed approach applied Berkovich Vickers indenters its advantages proven terms on metallic ceramic material. Graphical abstract