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Sökning: L773:9783981451627

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1.
  • Ahlström, Johan, 1969 (författare)
  • Lcf loop shape in near pearlitic steels – influence of temperature
  • 2013
  • Ingår i: Proceedings of 7th International Conference on Low Cycle Fatigue, Aachen, Germany, September 9–11, 2013. - 9783981451627 ; , s. 81-86
  • Konferensbidrag (refereegranskat)abstract
    • Specimens of near pearlitic railway wheel steels have been exposed to isothermal, uniaxial low cycle fatigue tests at constant total strain amplitudes from 0.4 – 1.0%. Temperatures have been varied from -60°C to 500°C. The data recorded has been analysed by fitting polynomial expressions to different parts of the loop. A technique used for extracting the unloading stiffness was presented at the previous conference, LCF6 in Berlin 2008. This procedure has now been extended to characterize the entire loop. The degree of micro plasticity and its effect on unloading stiffness, the strain energy and the cyclic stress development have been characterized. An increased cyclic hardening during the main part of the fatigue life was identified on cycling at 300°C at total strain amplitude of 0.6%. At 500°C the viscous behaviour dominates over the cyclic strain hardening yielding decreasing stress amplitude.
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2.
  • Skoglund, Peter, et al. (författare)
  • Fatigue and strength of new grey iron alloys for break discs
  • 2013
  • Ingår i: Seventh International Conference on Low Cycle Fatigue. - Berlin : Deutscher Verband für Materialforschung und -Prüfung E.V.. - 9783981451627 ; , s. 45-50
  • Konferensbidrag (refereegranskat)abstract
    • The static and low cycle fatigue properties of four pearlitic grey iron alloys intended for brake discs are investigated. The effect of alloying a base composition with 0.1 wt% and 0.3 wt% niobium is compared to a 0.3 wt% addition of the more conventional alloying element molybdenum. The results show that the static properties remain unaffected for an Nb content of 0.1 wt% while an addition of 0.3 wt% Nb or 0.3 wt% Mo increases the strength compared to the base alloy without Nb and Mo. The fatigue life on the other hand remains more or less unaffected by the alloying, although the stress levels are substantially higher for the compositions with 0.3 wt% Mo or 0.3 wt% Nb. Thus, the experiments show that graphite is very important for the low cycle fatigue life. It is also seen that crack propagation controls more than 90% of the life. Full scale brake dynamometer crack tests also gave a similar fatigue life of the different brake disc alloys independent of the composition.
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  • Resultat 1-2 av 2
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konferensbidrag (2)
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refereegranskat (2)
Författare/redaktör
Ahlström, Johan, 196 ... (1)
Skoglund, Peter (1)
Moverare, Johan, 197 ... (1)
Sjögren, Torsten (1)
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Linköpings universitet (1)
Chalmers tekniska högskola (1)
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Engelska (2)
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2013 (2)

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