Subcritical crack growth and threshold in borosilicate glass

Autor:	K. Keller, Theo Fett, K. Germerdonk, D. Munz, A. Grossmüller
Rok vydání:	1991
Předmět:	Cracking Materials science Mechanics of Materials Borosilicate glass Residual stress Threshold limit value Mechanical Engineering Solid mechanics Knoop hardness test General Materials Science Fracture mechanics Composite material Residual
Zdroj:	Journal of Materials Science. 26:253-257
ISSN:	1573-4803 0022-2461
DOI:	10.1007/bf00576060
Popis:	The crack-growth behaviour of borosilicate glass was investigated by use of lifetime measurements on Knoop-damaged specimens. The threshold behaviour in particular was observed, and the influence of residual wedging stresses and preloading below the threshold value were studied in detail. A threshold ofK lth = 0.38 MPam1/2 was found. The residual stress intensity factor caused by the Knoop indentations was found to beK lres,0≃ 0.1 MPam1/2. In a static test performed below the threshold, the threshold value was increased by ΔK lth≃ 0.15MPam1/2.
Databáze:	OpenAIRE
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