Dynamic fracture of glass and single-crystalline silicon

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作者：

Max-Planck-Inst. fur Metallforschung, Stuttgart, Germany ^{[1
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来源：

Z Metallkd | / 9卷 / 675-686期

关键词：

Potential drop method - Soda lime glass;

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摘要：

The dynamic brittle fracture of amorphous soda-lime glass and single-crystalline silicon was studied in a comparative experimental investigation. A potential drop technique was used to accurately determine the crack velocity. A terminal crack velocity vC of about 50% of the Rayleigh wave velocity vR was determined for glass. The terminal crack velocity in single-crystalline silicon is significantly higher, reaching about 0.85 vR = 3800 m/s. Inspection of the fracture surface revealed significant differences between the amorphous and the single-crystalline materials. A continuous increase in the size of the characteristic features is typical for the transition from mirror to mist and hackle regions of the fracture surface in glass. In contrast, the onset of a rough, hackle-like region is clearly discontinuous in silicon single crystals. Mirror-like flat and hackle regions may coexist at the same location on the fracture surface.

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