Influence of Size Effect and Stress Gradient on the High-cycle Fatigue Strength of a 1.4542 Steel

Benjamin Seisenbacher

Research output: ThesisMaster's ThesisResearch

Abstract

Nowadays technical applications require very small components which leads to the question of how to handle fatigue strength data gained from tests carried out on specimen which are even larger than the component itself. Previous high-cycle-fatigue (HCF) tests have outlined the negative influence of increasing “risk volumes” due to enlargement of the specimen size. Additional to the effect of “risk volumes” the influence of stress gradient may not be neglected as the gradient changes as well due to the enlargement of the specimen size. Especially thin profiles could be affected by high stress gradients which results in high and low stress loaded profile areas. The fatigue strength of an hourglass shaped specimen with a standardized diameter of 7.5 mm tends to have higher fatigue strength than a specimen with a larger diameter. In this work rotating bending tests were carried out on specimens with a diameter of 4 and 7.5 mm. Lifetime simulations with different specimen diameters (D2.5, D4 and D7.5) were carried out by a common simulation tool FEMFAT and simultaneous testing of D4 and D7.5 specimens was performed to compare the results. An outlook is given on how such influences can be estimated and an appropriate method can be derived for damage calculations.
Translated title of the contributionInfluence of Size Effect and Stress Gradient on the High-cycle Fatigue Strength of a 1.4542 Steel
Original languageGerman
Awarding Institution
  • Montanuniversität Leoben
Supervisors/Advisors
  • Kober, Martin, Supervisor
Publication statusPublished - 2016
Externally publishedYes

Fingerprint

Steel
Bending tests
Fatigue of materials
Testing
Fatigue strength

Fields of Expertise

  • Sustainable Systems

Cite this

Einflüsse auf die Schwingfestigkeit eines hochfesten Stahls bei Schwingspielzahlen größer 1E7. / Seisenbacher, Benjamin.

2016.

Research output: ThesisMaster's ThesisResearch

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abstract = "Nowadays technical applications require very small components which leads to the question of how to handle fatigue strength data gained from tests carried out on specimen which are even larger than the component itself. Previous high-cycle-fatigue (HCF) tests have outlined the negative influence of increasing “risk volumes” due to enlargement of the specimen size. Additional to the effect of “risk volumes” the influence of stress gradient may not be neglected as the gradient changes as well due to the enlargement of the specimen size. Especially thin profiles could be affected by high stress gradients which results in high and low stress loaded profile areas. The fatigue strength of an hourglass shaped specimen with a standardized diameter of 7.5 mm tends to have higher fatigue strength than a specimen with a larger diameter. In this work rotating bending tests were carried out on specimens with a diameter of 4 and 7.5 mm. Lifetime simulations with different specimen diameters (D2.5, D4 and D7.5) were carried out by a common simulation tool FEMFAT and simultaneous testing of D4 and D7.5 specimens was performed to compare the results. An outlook is given on how such influences can be estimated and an appropriate method can be derived for damage calculations.",
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N2 - Nowadays technical applications require very small components which leads to the question of how to handle fatigue strength data gained from tests carried out on specimen which are even larger than the component itself. Previous high-cycle-fatigue (HCF) tests have outlined the negative influence of increasing “risk volumes” due to enlargement of the specimen size. Additional to the effect of “risk volumes” the influence of stress gradient may not be neglected as the gradient changes as well due to the enlargement of the specimen size. Especially thin profiles could be affected by high stress gradients which results in high and low stress loaded profile areas. The fatigue strength of an hourglass shaped specimen with a standardized diameter of 7.5 mm tends to have higher fatigue strength than a specimen with a larger diameter. In this work rotating bending tests were carried out on specimens with a diameter of 4 and 7.5 mm. Lifetime simulations with different specimen diameters (D2.5, D4 and D7.5) were carried out by a common simulation tool FEMFAT and simultaneous testing of D4 and D7.5 specimens was performed to compare the results. An outlook is given on how such influences can be estimated and an appropriate method can be derived for damage calculations.

AB - Nowadays technical applications require very small components which leads to the question of how to handle fatigue strength data gained from tests carried out on specimen which are even larger than the component itself. Previous high-cycle-fatigue (HCF) tests have outlined the negative influence of increasing “risk volumes” due to enlargement of the specimen size. Additional to the effect of “risk volumes” the influence of stress gradient may not be neglected as the gradient changes as well due to the enlargement of the specimen size. Especially thin profiles could be affected by high stress gradients which results in high and low stress loaded profile areas. The fatigue strength of an hourglass shaped specimen with a standardized diameter of 7.5 mm tends to have higher fatigue strength than a specimen with a larger diameter. In this work rotating bending tests were carried out on specimens with a diameter of 4 and 7.5 mm. Lifetime simulations with different specimen diameters (D2.5, D4 and D7.5) were carried out by a common simulation tool FEMFAT and simultaneous testing of D4 and D7.5 specimens was performed to compare the results. An outlook is given on how such influences can be estimated and an appropriate method can be derived for damage calculations.

M3 - Masterarbeit

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