AUTHOR=Scannell Garth , Laille Denis , Célarié Fabrice , Huang Liping , Rouxel Tanguy 

TITLE=Interaction between Deformation and Crack Initiation under Vickers Indentation in Na2O–TiO2–SiO2 Glasses

JOURNAL=Frontiers in Materials

VOLUME=4

YEAR=2017

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2017.00006

DOI=10.3389/fmats.2017.00006

ISSN=2296-8016

ABSTRACT=<p>An observed minimum in the critical crack initiation load at Poisson’s ratio (ν) of 0.21–0.22 in Na<sub>2</sub>O–TiO<sub>2</sub>–SiO<sub>2</sub> glasses was investigated. Vickers indentation was used to examine hardness and average cracking length, fracture toughness was measured through the single-edge pre-cracked beam method, and volumes of densification and shear flow around indents were measured using atomic force microscopy. Relations between the critical crack initiation load and hardness, average crack length, fracture toughness, and the volume fractions of densification and shear flow were studied. No correlations were observed between hardness, average crack length, or fracture toughness with the critical crack initiation load. A link between the minimum in crack initiation load and a change in deformation mechanisms (densification versus shear flow) was observed.</p>