Stefanie E. Stanzl‐Tschegg

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Influence of atmospheric moisture on slow fatigue crack growth at ultrasonic frequency in aluminium and magnesium alloys

Fatigue & Fracture of Engineering Materials & Structures (2002)

M. Papakyriacou H. Mayer Uwe Fuchs Stefanie E. Stanzl‐Tschegg Robert P. Wei

ABSTRACT The deleterious influence of atmospheric moisture on the fatigue properties of an aluminium wrought alloy AlZnMgCu1.5‐T6, an aluminium cast alloy AlSi9Cu3 and magnesium cast alloys AM60 hp, AZ91 hp and AS21 hp has been studied at a cycling frequency of 20 kHz. Atmospheric moisture accelerates fatigue crack growth and decreases the threshold stress intensities to 55–75% of the respective values in vacuum. In ambient air, fatigue crack growth rates were up to two decades higher than those in vacuum. Accelerated crack growth was found at propagation rates below about 2 × 10 −9 m cycle −1 in aluminium alloys and below about 3 × 10 −8 m cycle −1 in magnesium alloys. As the threshold regime is approached, fatigue cracks in ambient air either propagate at a minimum mean growth rate on average of approximately one lattice spacing per cycle or they stop propagating, whereas mean growth rates of 10 −12 m cycle −1 were found in vacuum. Crack initiation and slow fatigue crack growth mainly determine lifetimes in the high cycle regime, and endurance data obtained at ultrasonic frequency in ambient air of 40–60% relative humidity are similar to lifetimes measured at conventional frequencies.

Paris' law

10.1046/j.1460-2695.2002.00571.x

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Citations (45)

Strength properties and density of SO 2 polluted spruce wood

European Journal of Wood and Wood Products (1999)

Stefanie E. Stanzl‐Tschegg Louise Filion Elmar Tschegg Alexander Reiterer

Maximum density

Wedge (geometry)

Densitometry

10.1007/s001070050027

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Citations (3)

Ash-burn test according to ISO 3340 for the evaluation of the abrasive effect of particleboard on cutting tools

Wood Material Science and Engineering (2021)

Richard Patsch Stephan Frömel-Frybort Stefanie E. Stanzl‐Tschegg

The mineral content of particleboard (PB) is suspected to be one of the main factors influencing cutting-tool life. The aim of this study was therefore to investigate the influence of the mineral content of PBs on tool life as a function of the mineral content and the size of the largest sand grains. The mineral content of PB according to ISO 3340 was used as a value for the abrasiveness. Different samples of PB were analysed by comparison of the mineral content and the lifetime of a tungsten-carbide knife. In addition, the maximum size of the mineral grains in comparison with the total amount of mineral content was studied. The investigation showed that the mineral content of the PB and maximum sand-grain size are not sufficient to predict tool life. In comparison with the result of a lifetime test, which directly measures the wear behaviour of a board, the treatment of the ashes with hydrochloric acid after combustion, according to ISO 3340, destroys abrasive ingredients in the PB; therefore, this method is not suitable for identifying all abrasive components of a PB.

10.1080/17480272.2021.1923061

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Citations (0)

Journal of Materials Science (2001)

Gerhard Sinn Alexander Reiterer Stefanie E. Stanzl‐Tschegg

Carbon fibers

10.1023/a:1017954300015

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Citations (82)

Microstructure and fracture mechanical response of wood

International Journal of Fracture (2006)

Stefanie E. Stanzl‐Tschegg