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The different regions of crack growth in established failure models are often approached by a linear approximation (Haldimann et al. 2008; Overend and Zammit 2012; Alter et al. 2017; Kinsella and Persson 2018). This is particularly useful, since the crack grows only for a comparably short time in the last two growth regions and spends most of its growth in the first region, the linear region. Within this approximation, the crack velocity v can be expressed as a function of the stress intensity factor \\({\\text {K}}_{\\mathrm{I}}\\) by

Currently, the influence of environmental conditions on the strength distribution of glass has not been fully investigated, although the influence on the strength is proven (Wiederhorn 1967). While a higher humidity, and thus more water molecules at the crack tip, leads to a higher growth rate, it could be shown that the strength of glass increases in hot water (Wiederhorn et al. 2013b). It could be shown that some coatings on the glass surface prevent the transport of water molecules to the crack tip and thus increasing the failure strength (Mariggiò et al. 2019). The processes at the crack tip and the results of observation at the crack tip by means of modern methods are summarized in Wiederhorn et al. (2013a). However, the behavior of the crack growth parameters \\(\\text {n}\\) and \\({\\hbox {v}_{0}}\\) from the linear approximation with respect to the environmental conditions for engineering applications has not yet been investigated.

see Fuller et al. (1983), with \\({\\upsigma _{\\mathrm{in}}^{\\mathrm{0n}\\prime }}\\) as the inert strength and \\({\\text {c}}_{\\mathrm{in}}\\) as the indentation crack size including growth during aging. The inert strength is given when there is no sub-critical crack growth before failure. It should be noted that Eq. (3) is only valid if the critical crack length \\({\\text {c}}_{\\mathrm{f}}\\) is greater than the initial crack length \\({\\text {c}}_{\\mathrm{i}}\\). The necessary condition is that

with a coefficient of determination of \\(R^2=0.97\\) and \\(R^2=0.99\\). For \\(\\mathrm{T}=15\\,^\\circ \\text {C}\\) a fit was omitted due to only three existing values. With a general comparison of the measured values from 15 to 35 \\(^\\circ \\text {C}\\) a comparable run of the curve with increasing humidity can be observed between temperature and humidity. The polynomials are intended to show the general behavior of the crack growth parameters as a function of the environmental conditions. 153554b96e

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