Vickers indentation behavior of several commercial glasses at high temperatures

Plasticity, crack initiation and defect resistance in alkali-borosilicate glasses: From normal to anomalous behavior

“…This argumentation is based on the observation of ring and cone cracks around the indentation marks in vitreous SiO 2 and other commercially available glasses with high free volume and containing only small amounts of network modifiers, e.g., the Duran-type composition presented in Fig. 2a [53,71,95,[105][106][107]. On the other hand, a pronounced contribution of volume-conservative shear flow to plastic deformation was observed for glasses with high modifier concentrations, e.g., BK7-type composition (Fig.…”

“…Depending on the deformation mechanism and the elastic-plastic properties of the material, several different crack patterns can develop, but of practical importance are only median and radial cracks, since their propagation perpendicular to the glass surface is responsible for the fracture under bending or tensile loading conditions [95,106]. The resistance against the formation of median and radial cracks can be approximated by a pragmatic Vickers indentation test.…”

3D analysis of crack morphologies in silicate glass using FIB tomography

“…2) are consistent with those previously reported in other comparable studies. 3,7,20,21 In addition to the cracks, a spidery zone of light grey contrast was also observed to surround the residual damage zone and surface cracks (Fig. 2).…”

“…2 shows the two types of cracks visible on the surface around these indentation sites, namely (i) radial cracks, and (ii) circumferential cracks. 3,7,20,21 Most of the 100 g indent sites showed only three radial cracks, of maximum length 12 m, which connect to the outermost circumferential cracks. The higher load 200 g sites showed four radial cracks of maximum length 25 m eminating from the corners of the residual indent impression ( Fig.…”

Doppelringbiegeversuche an Glasplatten aus Kalk‐Natron‐Silikatglas bei erhöhten Temperaturen bis in den Transformationsbereich

“…Zudem wurden in der Materialwissenschaft Verfahren entwickelt, Glasproben durch Mikroindentierung zu schädigen und den Prozess der Rissbildung in unterschiedlichen Belastungssituationen mikroskopisch zu beobachten. In [5], [6] und [7] wurde die Temperaturabhängigkeit des Rissverhaltens bei Schädigungen durch Mikroindentation von Gläsern, darunter auch Kalk-Natron-Silikatglas, mit dem Vickers-Diamanten bei Temperaturen bis in den Transformationsbereich untersucht. Dabei konnten qualitative Unterschiede bei der Rissentstehung und dem Bruchverhalten bei unterschiedlichen Temperaturen festgestellt werden.…”