Papers by Stefanie Stanzl-tschegg
Fibre Diffraction Review, Apr 1, 2005
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Elsevier eBooks, 2001
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International Journal of Fatigue, 2001
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Procedia structural integrity, 2016
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Advanced Engineering Materials, Jul 1, 2009
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Fatigue & Fracture of Engineering Materials & Structures, Mar 19, 2014
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Engineering Fracture Mechanics, Oct 1, 2015
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International Journal of Fatigue, Sep 1, 1999
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Journal of The Mechanical Behavior of Biomedical Materials, Jul 1, 2017
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Fatigue & Fracture of Engineering Materials & Structures, Apr 2, 2007
Fatigue crack growth under constant and random loading conditions was investigated for a metastab... more Fatigue crack growth under constant and random loading conditions was investigated for a metastable austenitic‐bainitic steel in comparison with a ferritic chromium steel at very low crack growth rates. Experimentally determined random crack growth was compared with linear Miner calculations on the basis of constant amplitude results. It was found that the measured crack growth rates in transforming material are a factor of 10 lower than the calculated values, whereas the difference is only a factor of 2 for the ferritic steel. The reason for the pronounced crack growth retardation in the metastable alloy is transformation of part of the austenitic phase into martensite in the stress field of the crack tip, accompanied by a volume increase and, consequently, residual compressive stresses. Rare high load cycles in the random sequence increase the closure level, which then leads to pronounced retardation of fatigue crack growth for the numerous successive low amplitude cycles.
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International Journal of Fatigue, Nov 1, 2000
ABSTRACT Long term corrosion fatigue properties of two materials which are candidates for skeleta... more ABSTRACT Long term corrosion fatigue properties of two materials which are candidates for skeletal implants — cold worked c.p. Niobium and c.p. Tantalum — have been investigated. Fatigue properties have been compared to two implant materials in clinical use — c.p. Titanium and Ti–6Al–7Nb alloy. Constant amplitude fatigue experiments (S–N curves) were performed at ultrasonic frequency (20 kHz) with two different surface structures (ground surface and blasted and shot peened surface) in ambient air and in a corrosive fluid similar to the body fluid in the oral cavity. The endurance limit at 2×108 cycles of all materials decreased by 5–20% if they were cycled in corrosive fluid instead of ambient air. The loss of fatigue strength is more pronounced for ground Ti–6Al–7Nb alloy and c.p. Ti than for ground c.p. Nb cw and c.p. Ta cw. Fracture surfaces show a more pronounced embrittlement of ground Ti–6Al–7Nb alloy and c.p. Titanium after cycling in corrosive fluid than ground c.p. Tantalum and c.p. Niobium. A beneficial influence of surface structuring by blasting and shot peening on the fatigue properties was found for all materials in both environments. Fatigue loading using ultrasonic frequency allows one to select appropriate implant materials and to determine their very-high cycle corrosion-fatigue behaviour within reasonable testing times. Though the obtained high-frequency values may not be fully representative of actual in vivo behaviour, they are regarded as useful material characterizing values.
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Materials Science and Engineering: C, Aug 1, 2011
Wood is one of the natural materials that inspired mankind very early to imitate some of its feat... more Wood is one of the natural materials that inspired mankind very early to imitate some of its features to develop new intelligent artificial materials. The properties of wood are optimized in various respects and in various areas. It exhibits, for example, excellent mechanical ...
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Zeitschrift Fur Metallkunde, Aug 1, 2002
Abstract Copper single crystals and polycrystalline very-low-carbon steel (0.036 wt.% C) were fat... more Abstract Copper single crystals and polycrystalline very-low-carbon steel (0.036 wt.% C) were fatigue loaded at low and very low amplitudes. The resulting dislocation structures and surface features were studied and the results correlated. Similarities of the face- and body-centred cubic materials as to the resulting dislocation and surface structures are outlined. In addition, the question of an eventual effect of the loading frequency on the resulting microstructural changes is shortly discussed.
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Abstracts of ATEM, 2003
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Fatigue & Fracture of Engineering Materials & Structures, Aug 11, 2017
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International Journal of Fatigue, Dec 1, 2017
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Fatigue & Fracture of Engineering Materials & Structures, May 11, 2017
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Engineering Fracture Mechanics, 2015
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Wood and fiber …, 1994
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Strassenforschung, 2001
Es ist bekannt, dass Schaeden in Asphaltbefestigungen besonders waehrend warmer Perioden die Tend... more Es ist bekannt, dass Schaeden in Asphaltbefestigungen besonders waehrend warmer Perioden die Tendenz zeigen zu "heilen". In der vorliegenden Arbeit wird dieser Effekt an Asphalt und Asphaltverbunden qualitativ und quantitativ erfasst. Als Messmethode fuer saemtliche Bruchpruefungen dieser Arbeit findet das Keilspaltverfahren nach Tschegg Anwendung. Im Rahmen umfangreicher Vorversuche konnten die wesentlichen Einflussgroessen auf das Heilungsverhalten von Asphalt experimentell ermittelt werden. Es sind dies die Bitumensorte bei Asphalt beziehungsweise die Haftklebersorte bei Asphaltverbunden, die Prueftemperatur der Probe, die Kraft, mit der ein Riss nach der Bruchpruefung geschlossen wird und die Temperatur waehrend eines Heilungsprozesses. Als optimale Probenform und Probengroesse erwiesen sich Bohrkerne mit einem Durchmesser von 150 mm und einer Hoehe von 100 bis 110 mm. Um die Zahl der variierenden Parameter einzuschraenken, wurde als Prueftemperatur bei den Hauptversuchen stets 0 Grad Celsius gewaehlt. Die Hoehe der Rissschliesskraft und der Temperatur bei der Heilung variierten, um deren Einfluss auf den Heilungseffekt erfassen zu koennen. Grundsaetzlich kann ausgesagt werden, dass Risse in Asphalt und Asphaltverbunden bis zu einem bestimmten Grad heilen koennen. Es wurde beobachtet, dass sich die Festigkeit nach den ersten Messzyklen stabilisiert, der Widerstand gegen Rissausbreitung jedoch von Zyklus zu Zyklus sinkt (=Versproedung). Die Variation der Rissschliesskraft wirkt sich massiv auf die Festigkeit, jene der Temperatur waehrend des Heilungsprozesses auf den Widerstand gegen Rissausbreitung aus. Polymermodifizierte Bitumen zeigen kein besseres Heilungsverhalten, es konnte im Gegenteil sogar an einer hochfesten Bitumensorte festgestellt werden, dass praktisch kein nutzbarer Heilungseffekt auftrat, unabhaengig von den variierenden Parametern.
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Papers by Stefanie Stanzl-tschegg