### Abstract

Original language | English |
---|---|

Pages (from-to) | 126-140 |

Number of pages | 15 |

Journal | Open Engineering |

Volume | 7 |

Issue number | 1 |

DOIs | |

Publication status | Published - 23 Jun 2017 |

### Fingerprint

### Keywords

- yield strength
- cyclic plasticity
- fatigue life
- fatigue limit
- steel

### Cite this

}

**On cyclic yield strength in definition of limits for characterisation of fatigue and creep behaviour.** / Gorash, Yevgen; MacKenzie, Donald.

Research output: Contribution to journal › Article

TY - JOUR

T1 - On cyclic yield strength in definition of limits for characterisation of fatigue and creep behaviour

AU - Gorash, Yevgen

AU - MacKenzie, Donald

PY - 2017/6/23

Y1 - 2017/6/23

N2 - This study proposes cyclic yield strength as a potential characteristic of safe design for structures operating under fatigue and creep conditions. Cyclic yield strength is defined on a cyclic stress-strain curve, while monotonic yield strength is defined on a monotonic curve. Both values of strengths are identified using a two-step procedure of the experimental stress-strain curves fitting with application of Ramberg-Osgood and Chaboche material models. A typical S-N curve in stress-life approach for fatigue analysis has a distinctive minimum stress lower bound, the fatigue endurance limit. Comparison of cyclic strength and fatigue limit reveals that they are approximately equal. Thus, safe fatigue design is guaranteed in the purely elastic domain defined by the cyclic yielding. A typical long-term strength curve in time-to-failure approach for creep analysis has two inflections corresponding to the cyclic and monotonic strengths. These inflections separate three domains on the long-term strength curve, which are characterised by different creep fracture modes and creep deformation mechanisms. Therefore, safe creep design is guaranteed in the linear creep domain with brittle failure mode defined by the cyclic yielding. These assumptions are confirmed using three structural steels for normal and high-temperature applications. The advantage of using cyclic yield strength for characterisation of fatigue and creep strength is a relatively quick experimental identification. The total duration of cyclic tests for a cyclic stress-strain curve identification is much less than the typical durations of fatigue and creep rupture tests at the stress levels around the cyclic yield strength.

AB - This study proposes cyclic yield strength as a potential characteristic of safe design for structures operating under fatigue and creep conditions. Cyclic yield strength is defined on a cyclic stress-strain curve, while monotonic yield strength is defined on a monotonic curve. Both values of strengths are identified using a two-step procedure of the experimental stress-strain curves fitting with application of Ramberg-Osgood and Chaboche material models. A typical S-N curve in stress-life approach for fatigue analysis has a distinctive minimum stress lower bound, the fatigue endurance limit. Comparison of cyclic strength and fatigue limit reveals that they are approximately equal. Thus, safe fatigue design is guaranteed in the purely elastic domain defined by the cyclic yielding. A typical long-term strength curve in time-to-failure approach for creep analysis has two inflections corresponding to the cyclic and monotonic strengths. These inflections separate three domains on the long-term strength curve, which are characterised by different creep fracture modes and creep deformation mechanisms. Therefore, safe creep design is guaranteed in the linear creep domain with brittle failure mode defined by the cyclic yielding. These assumptions are confirmed using three structural steels for normal and high-temperature applications. The advantage of using cyclic yield strength for characterisation of fatigue and creep strength is a relatively quick experimental identification. The total duration of cyclic tests for a cyclic stress-strain curve identification is much less than the typical durations of fatigue and creep rupture tests at the stress levels around the cyclic yield strength.

KW - yield strength

KW - cyclic plasticity

KW - fatigue life

KW - fatigue limit

KW - steel

UR - https://www.degruyter.com/view/j/eng.2017.7.issue-1/eng-2017-0019/eng-2017-0019.xml?format=INT

U2 - 10.1515/eng-2017-0019

DO - 10.1515/eng-2017-0019

M3 - Article

VL - 7

SP - 126

EP - 140

JO - Open Engineering

JF - Open Engineering

SN - 2391-5439

IS - 1

ER -