Charakterisierung der Kratzanfälligkeit von Gläsern im Bauwesen

Schula, Sebastian

doi:10.1007/978-3-662-47782-3

Cited by 23 publications

(19 citation statements)

References 91 publications

(166 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This is very unfavourable for cyclic fatigue tests, as very short lifetimes (seconds) or very long lifetimes (years) can occur with real geometrical and material parameters. Therefore, a method for a defined pre-damage was developed in which the glass sample is indented and scratched with a conical diamond (120°, tip radius of r S = 5 μm) at a defined vertical indentation force of 500 mN in an Universal Surface Tester (UST), see [12,13]). The sample is scratched for a length of 2 mm (Fig.…”

Section: Defined Pre-damage Of the Samplesmentioning

confidence: 99%

Cyclical fatigue of annealed and of thermally tempered soda-lime-silica glass

Schneider

Hilcken

2018

MATEC Web Conf.

View full text Add to dashboard Cite

Abstract. We present experimental and theoretical investigations on the cyclic fatigue of annealed and of thermally tempered soda-lime-silica glass. Static fatigue due to subcritical crack growth at micro cracks significantly decreases the macroscopic strength of soda-lime-silica glass and causes a time-dependent strength reduction. A subsequent thermal tempering process is typically used to induce residual surface compression stresses, which inhibit the crack growth of surface cracks, and corresponding bulk tension stresses. From the experimental results we show that the existing models for static fatigue used in linear elastic fracture mechanics can be used for the lifetime prediction of cyclically loaded annealed glass and thermally tempered glass, although the (static) crack growth exponent slightly decreases in cyclic loading. The equivalent duration of tensile stress at the crack tip of a micro crack governs the crack growths and not the number of cycles. The threshold for subcritical crack growth determined from the cyclic experiments was found to be in good agreement with data from literature. But unlike in strength tests with singular and quasi-static re-loading, it could be found that periodic loading with load free intervals does not lead to a strength increase by crack healing effects. Based on the results, an engineering design concept for cyclically loaded glass is presented.

show abstract

Section: Defined Pre-damage Of the Samplesmentioning

confidence: 99%

Cyclical fatigue of annealed and of thermally tempered soda-lime-silica glass

Schneider

Hilcken

2018

MATEC Web Conf.

View full text Add to dashboard Cite

show abstract

“…Similar values of vertical deformation at a micro-scale level were found for scratches in annealed and fully toughened glass indicating that their hardness does not differ (Schneider et al 2012). However, differences were noticed at a nanoscale level indicating that chemically toughened glass exhibits the highest hardness (Schula 2014). Chip formation along the direction of the scratch, occurs at lower loads for fully toughened glass but not in annealed glass, indicating the superior scratch resistance of annealed glass (Schneider et al 2012).…”

Section: Introductionmentioning

confidence: 96%

The strength of aged glass

Datsiou

Overend

2017

Glass Struct Eng

View full text Add to dashboard Cite

Glass is known for its excellent durability, but the strength of glass is very sensitive to the characteristics of its surface, which is known to accumulate damage during its service life. There is however, a lack of strength data on weathered or aged glass, particularly on thermally or chemically treated glass. In this study a carefully calibrated sand trickling test is used to produce surface damage equivalent to erosive action of 20 years of natural weathering on different types of glass: soda-lime-silica annealed, soda-limesilica fully toughened and aluminosilicate chemically toughened. The soda-lime-silica glass specimens are tested destructively in their as-received and artificially aged form in a conventional coaxial double ring setup, while the alumino-silicate chemically toughened specimens are tested in an improved coaxial double ring set-up. Fractography is subsequently used to identify and measure the critical flaw size on each specimen. The strength data are analysed statistically and the design strengths for each glass type are obtained. It is found that all glasses suffer a loss in strength after artificial ageing, with fully toughened glass providing the best post-aged performance. It was also found that Electronic supplementary material The online version of this article

show abstract

“…While the value of n was repeatedly estimated at about 16 for soda-lime glass in ambient conditions, the value of A at 50% relative humidity was estimated in a range spanning more than two orders of magnitude, see Schula (2015) for an overview of those experiments. Hence, it is generally challenging to predict subcritical crack growth in ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

A numerical method for analysis of fracture statistics of glass and simulations of a double ring bending test

Kinsella

Persson

2018

Glass Struct Eng

View full text Add to dashboard Cite

The results from a new numerical method for simulating the strength and fracture locations of small glass specimens subjected to double ring bending are compared with experimental data. The method implements the weakest-link principle while assuming the existence of Griffith flaws. A Weibull distribution for the strength is simulated based on a single population of Pareto distributed crack sizes. The effect of using different fracture criteria is investigated. An alternative distribution is simulated based on two populations of flaws. This distribution models the apparent bimodality in the empirical data set. The numerical method is dependent on a representation of the surface flaws condition in glass. As new techniques become available for examining the surface characteristics, this numerical method is promising as a means for modelling the strength better than current methods do.

show abstract

Charakterisierung der Kratzanfälligkeit von Gläsern im Bauwesen

Cited by 23 publications

References 91 publications

Cyclical fatigue of annealed and of thermally tempered soda-lime-silica glass

Cyclical fatigue of annealed and of thermally tempered soda-lime-silica glass

The strength of aged glass

A numerical method for analysis of fracture statistics of glass and simulations of a double ring bending test

Contact Info

Product

Resources

About