Cyclic yield strength in definition of design limits for fatigue and creep

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This study proposes a cyclic yield strength (CYS, σc ) as a key characteristic for the definition of safe design for engineering structures operating under fatigue and creep conditions. CYS is defined on a cyclic stress-strain curve, while monotonic yield strength (MYS, σm ) is defined on a monotonic stress-strain curve. Both values of σc and σm are identified using a 2-steps fitting procedure of the experimental stress-strain curves using Ramberg-Osgood and Chaboche material models. Comparison of σc and fatigue endurance limit σf on the S-N fatigue curve reveals that they are approximately equal. Hence, basically safe fatigue design is guaranteed in purely elastic domain defined by the σc . A typical creep rupture curve in time-to-failure approach for creep analysis has 2 inflections corresponding to the σc and σm . These stresses separate 3 sections on the creep rupture curve, which are characterised by 3 different creep fracture modes and 3 creep deformation mechanisms. Thus, basically safe creep design is guaranteed in linear creep domain with brittle failure mode defined by the σc . These assumptions are confirmed for several structural low- and high-alloy steels for normal and high-temperature
Original languageEnglish
Pages (from-to)365-366
Number of pages2
JournalProceedings in Applied Mathematics and Mechanics, PAMM
Issue number1
Early online date21 Mar 2014
Publication statusPublished - Dec 2014
Event85th Annual Meeting of the International Association of Applied Mathematics and Mechanics, GAMM 2014 - Erlangen-Nürnberg, Germany
Duration: 10 Mar 201414 Mar 2014


  • cyclic analysis
  • design limits
  • fatigue assessment
  • creep-fatigue strength


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