Fracture of glassy materials as detected by real-time Atomic Force Microscopy (AFM) experiments

Details Fracture of glassy materials as detected by real-time Atomic Force Microscopy (AFM) experiments Fracture of glassy materials as detected by real-time Atomic Force Microscopy (AFM) experiments

2002-07-24

arxiv.org/abs/cond-mat/0207583v1

Appl. Surf. Sci. 212-213 p.92 (2003)

Physics

Condensed Matter

Statistical Mechanics

6 pages, 5 figures, submitted to Applied surface Science

Scientific paper

We have studied the low speed fracture regime for different glassy materials with variable but controlled length scales of heterogeneity in a carefully mastered surrounding atmosphere. By using optical and atomic force (AFM) microscopy techniques we tracked in real-time the crack tip propagation at the nanometer scale on a wide velocity range (1 mm/s and 0.1 nm/s and below). The influence of the heterogeneities on this velocity is presented and discussed. Our experiments revealed also -for the first time- that the crack advance proceeds through nucleation, growth and coalescence of nanometric damage cavities inside the amorphous phase, which generate large velocity fluctuations. The implications of the existence of such a nano-ductile fracture mode in glass are discussed.

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