On radial, circumferential, and spiral cracks in fractured glass plates

This is a fractographic case study of a mechanically loaded glass plate that formed a remarkable spiral crack when the plate fractured. Common radial and circumferential cracking in disks and plates in general are first reviewed. The exceptional spiral crack is then analyzed. The origin of failure w...

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Bibliographic Details
Published in:International journal of applied glass science 2021-04, Vol.12 (2), p.189-197
Main Authors: Quinn, George D., Swab, Jeffrey J., Patel, Parimal
Format: Article
Language:English
Subjects:
Cracking (fracturing)
Disks
Failure analysis
float glass < Products
fractography < Mechanical Properties
Fractures
Glass plates
measurements < Mechanical Properties
Plate glass
sheet glass < Products
spiral crack
stress < Mechanical Properties
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Summary:This is a fractographic case study of a mechanically loaded glass plate that formed a remarkable spiral crack when the plate fractured. Common radial and circumferential cracking in disks and plates in general are first reviewed. The exceptional spiral crack is then analyzed. The origin of failure was an unusual flaw on the nominal compression side of the plate. The complex spiral fracture pattern has been observed in other large plate glass fractures that break under blunt impact conditions. Spiral cracks can form and propagate from flaws on the front side of a flexed plate that is rigidly supported at its rim or, alternatively, is supported from underneath and has a large overhang.
ISSN:2041-1286
2041-1294
DOI:10.1111/ijag.15868