Abstract
In the present work, subcritical crack growth in soda–lime silicate glass is investigated under different environmental conditions. Crack growth parameters as a function of temperature and humidity were determined by dynamic fatigue tests, which has been verified by using the in-situ method of filming crack growth during experiments. The specimens were pre-damaged for constant initial crack lengths in all specimens using the Vickers indentation test. The determined parameters were compared with those from literature in order to discuss existing deviations of sub-critical crack growth parameters in literature. These deviations may be caused by environmental conditions and different chemical compositions of the glass. Arrest lines were used to determine the ratio of crack width to crack depth in Vickers indented specimens. For the initial crack depth, images of fracture surfaces were taken using an scanning electron microscope. Furthermore, the influence of humidity and temperature on the failure stress of unindented specimens with a constant initial crack length was simulated.
Highlights
The strength of glasses has been studied and discussed in a number of publications and books, e.g. Haldimann et al (2008), Wachtman et al (2009), Quinn (2007) and Meyland et al (2019)
Thereby it could already be shown that the environmental conditions have an enormous influence on the failure strength of glass, (Wiederhorn and Bolz 1970; Ronchetti et al 2013)
A detailed derivation of the solution to determine subcritical crack growth parameters has already been made in Lawn et al (1981), Fuller et al (1983) and Wachtman et al (2009)
Summary
The strength of glasses has been studied and discussed in a number of publications and books, e.g. Haldimann et al (2008), Wachtman et al (2009), Quinn (2007) and Meyland et al (2019). For the determination of the crack growth parameters according to Eq (1) several methods are available in literature (Lawn et al 1981; Fuller et al 1983; Dwivedi and Green 1995; Wachtman et al 2009), where artificially indented cracks are used in most cases This has the advantage that the initial crack depth and the location of the crack are known. A disadvantage is that artificially created cracks may behave differently from natural cracks This problem occurs due to a plastic zone in the area of the intentation, which influences the determination of the growth parameters by induced residual stresses (Fuller et al 1983). Crack growth parameters are determined from Eq (1) at different temperatures and humidities using dynamic fatigue tests at different
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