Dauerschwingfestigkeit und zyklisches Werkstoffverhalten

Liu, J.; Zenner, Harald

doi:10.1002/mawe.19890201007

Cited by 8 publications

(2 citation statements)

References 3 publications

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“…ScWgwinkel der Kerbe 6 two pulsating normal stresses. 44. Statistical evaluation of experimentally and theoretically determined endurance limit of notched specimens under multiaxial loading.…”

Section: B )mentioning

confidence: 99%

Berechnung der Dauerschwingfestigkeit bei mehrachsiger Beanspruchung — Teil 2

Liu

Zenner

1993

Materialwissenschaft Werkst

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Section: B )mentioning

confidence: 99%

Berechnung der Dauerschwingfestigkeit bei mehrachsiger Beanspruchung — Teil 2

Liu

Zenner

1993

Materialwissenschaft Werkst

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“…In addition to hardness, the tensile properties, i.e., the yield strength σ y or the UTS, were also used in different scientific works to assess the fatigue limit [7,8,[15][16][17].…”

Section: Introductionmentioning

confidence: 99%

A New Approach to Estimate the Fatigue Limit of Steels Based on Conventional and Cyclic Indentation Testing

Görzen

Ostermayer

Lehner

et al. 2022

Metals

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For a reliable design of structural components, valid information about the fatigue strength of the material used is a prerequisite. As the determination of the fatigue properties, and especially the fatigue limit σw, requires a high experimental effort, efficient approaches to estimate the fatigue strength are of great interest. Available estimation approaches using monotonic properties, e.g., Vickers hardness (HV), and in some cases the cyclic yield strength, only allow a rough estimation of σw. The approaches solely based on monotonic properties lead to substantial deviations of the estimated σw in relation to the experimentally determined fatigue limit as they do not consider the cyclic deformation behavior. In this work, an estimation approach was developed, which is based on a correlation analysis of the fatigue limit σw, HV, and the cyclic hardening potential obtained in instrumented cyclic indentation tests (CIT). For this, eleven conditions from five different low-alloy steels were investigated. The CIT enable an efficient and quantitative determination of the cyclic hardening potential, i.e., the cyclic hardening exponentCHT eII, and thus, the consideration of the cyclic deformation behavior in an estimation approach. In this work, a strong correlation of σw with the product of HV and |eII| was observed. In relation to an existing estimation approach based solely on HV, considering the combination of HV and |eII| enables the estimation of σw with an enormously increased precision.

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Berechnung der Dauerschwingfestigkeit unter Berücksichtigung der spannungsmechanischen und statistischen Stützziffer

Liu¹,

Zenner²

1991

Materialwissenschaft Werkst

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Wird eine plastische Wechselverformung im Kerbgrund auch in Hohe der Dauerfestigkeit angenommen, so kann mit Hilfe der Neuber-Formel und des zyklischen Spannungs-Dehnungs-Diagramms eine makroskopische Stiitzwirkung berechnet werden. Wird weiterhin der statistische GroBeneinfluB nach dem Fehlstellenmodell beriicksichtigt, so kann die Kerbwirkung bei Bauteilen mit ausreichender Genauigkeit abgeschatzt werden. Der Nachweis fiir die Treffsicherheit des Modells wird anhand von Versuchsergebnissen an Probestaben aus Stahl gefuhrt. Fatigue Limit and Geometrical and Statistical Size EffectThe ratio of the fatigue limit of an unnotched specimen to that of a notched one, the fatigue notch factor Kf, is usually smaller than the theoretical stress concentration factor K,.With the assumption of a plastic cyclic deformation eapW at the level of the fatigue limit the fatigue limit for a notched specimen can be calculated. According to formula (4) this fatigue limit a , , , , is a function of K,, E,~W, the notch stress amplitude a,, the cyclic strengthening exponent n' and the fatigue limit of a smooth specimen OW. Moreover, taking into account the statistical size effect with the known "weakest link concept", see flow chart Fig. 9, the calculation is in a good agreement with 77 test results for steel. I Einleitung

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Dauerschwingfestigkeit und zyklisches Werkstoffverhalten

Cited by 8 publications

References 3 publications

Berechnung der Dauerschwingfestigkeit bei mehrachsiger Beanspruchung — Teil 2

Berechnung der Dauerschwingfestigkeit bei mehrachsiger Beanspruchung — Teil 2

A New Approach to Estimate the Fatigue Limit of Steels Based on Conventional and Cyclic Indentation Testing

Berechnung der Dauerschwingfestigkeit unter Berücksichtigung der spannungsmechanischen und statistischen Stützziffer

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