Spiral Dislocations on Glass Fracture Surfaces
作者:
W. C. Levengood,
T. S. Vong,
期刊:
Journal of Applied Physics
(AIP Available online 1960)
卷期:
Volume 31,
issue 8
页码: 1416-1421
ISSN:0021-8979
年代: 1960
DOI:10.1063/1.1735855
出版商: AIP
数据来源: AIP
摘要:
Within a certain range of composition spiral defects were observed on etched soda‐lime‐silica glasses. The patterns described spirals of Archimedes and appeared to originate from interstitial defects in the glass. Mutual stress influence effects were observed. The hypothesis of an existing torque field around the interstitial defects was useful in explaining the spiral mechanism. Application of mechanical torque stresses produced the spiral effect. In some cases it appeared feasible to apply stress energy relationships developed from dislocation theories to these minute flaw patterns.A dynamic spherical indenter technique was developed to study structural variations in these glasses. The lengths of flaws produced by a rolling indenter were found to be sensitive to changes in the silica content of the glasses and less affected by variations in the soda‐lime ratio. The effects of heating and crystallization were also studied.
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