Multiscale and multicycle instrumented indentation to determine mechanical properties: Application to the BK7 crown borosilicate

• Published in: Journal of materials research Vol. 32; no. 8; pp. 1444 - 1455
• Main Authors: Bentoumi, M., Bouzid, D., Benzaama, H., Mejias, A., Kossman, S., Montagne, A., Iost, A., Chicot, D.
• Format: Journal Article
• Language: English
• Published: New York, USA Cambridge University Press 28.04.2017; Springer International Publishing; Springer Nature B.V; Springer
• Subjects: Applied and Technical Physics; Biomaterials; Cerium oxides; Engineering Sciences; Epoxy resins; Experiments; Grain size; Inorganic Chemistry; Materials Engineering; Materials research; Materials Science; Mechanical properties; Nanotechnology; Physical properties; Residual stress; hardness; crown borosilicate BK7; elastic modulus; multicycle indentation; cracking
• ISSN: 0884-2914; 2044-5326
• DOI: 10.1557/jmr.2016.523

In this work, nano, micro, and macro-indentation tests under standard or multicycle loading conditions were performed for studying the mechanical behavior of a crown borosilicate glass sample with the objective to study the scale effect in indentation and the influence of cracks formation on the assessment of mechanical properties. When no cracks were initiated during the indenter penetration, especially for low indentation loads, the mechanical properties were deduced by applying different methodologies, (i) Standard (or monocyclic) loading, (ii) Continuous Stiffness Measurement mode, (iii) Constant and progressive multicycle loading, and (iv) Dynamic hardness computation. It has been found independently of the loading conditions, Martens hardness and elastic modulus are approximately 3.3 and 70 GPa, respectively. However, when cracking and chipping are produced during the indentation test, two damage parameters related to hardness and elastic modulus can be used for representing the decrease of the mechanical properties as a function of the relative penetration depth.