Berlin 2018 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 17: Topical Session (Symposium MM): Fundamentals of Fracture
MM 17.1: Vortrag
Montag, 12. März 2018, 17:30–17:45, TC 006
Micromechanical testing of glasses at room temperature - the effect of strain rate in micropillar compression and impact nano-indentation — •Christoffer Zehnder1, Hanno Rempel1, Jan-Niklas Peltzer1, James S.K.-L. Gibson1, Doris Möncke2, and Sandra Korte-Kerzel1 — 1IMM, RWTH Aachen University, Germany — 2Vaxjö University, Sweden
It is well known that the mechanical properties of glasses are closely related to their atomic structure. The exact structure-property-relationship, however, is only poorly understood even for fundamental mechanisms like shear and densification and their influence on the transition between plastic deformation and fracture. Nanomechanical test methods like micropillar compression and impact nano-indentation can help fill this gap. In this study a sodium-boro-silicate glass is quenched to different temperatures to induce changes in the atomic structure. Micropillar compression was used to introduce plastic deformation into these glasses at room temperature in an uniaxial stress state. By increasing the strain rate it is shown that deformation shifts from stable crack growth to brittle failure. Impact nano-indentation showed a hardness plateau for high strain rates. Changing the glass structure leads to a shift of the corresponding strain rates to different values. These findings are analysed against the background of the glass structure and occurrence of shear and densification is discussed.