Surface flaws in glass
Technical Report
·
OSTI ID:5328650
The nature of surface flaws in glass is examined in the light of indentation fracture theory. First, the mechanical response of well-developed indentation cracks to applied stresses is described. A characteristic feature of the predicted response is a stage of precursor growth to a critical failure configuration, due to the stabilizing influence of residual elastic-plastic stresses. This characteristic is confirmed by direct observations of the crack evolution. Then, it is demonstrated from acoustic scattering experiments that machining damage flaws have essentially the same characteristic response, implying that they are true microcracks. Finally, aging experiments on indented, machined and abraded surfaces, in aqueous environments, are described. Strength recovery with aging time is observed in all cases, provided residual stresses remain active during exposure to the environment, and is directly attributable to secondary crack growth effects.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5328650
- Report Number(s):
- LBL-16076; ON: DE85016642
- Country of Publication:
- United States
- Language:
- English
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