Untersuchung zur Steigerung der Dauerfestigkeit von Wellen durch Festwalzen
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
In drive technology, resource efficiency, cost reduction and increased performance are the main requirements. At component level, this means strengthening the fatigue strength in the critical areas. Mechanical surface hardening influences the boundary layer properties, but there are currently gaps in knowledge regarding the effect of machining on the resulting load capacity. There is currently no known method of how the influence of the manufacturing process parameters can be taken into account in the fatigue strength assessment. This is where an ongoing research project comes in. In the experimental part, staircase tests according to Hück are being carried out on unhardened and deep-rolled components. The test programm includes small specimens, shafts and press fits. Different notch shapes, deep rolling parameters and materials form a comprehensive test programm. In order to be able to fully evaluate the increase in fatigue strength by deep rolling, the following influencing factors are analysed in addition to the cyclic fatigue tests
- Surface roughness, which is generally reduced by deep rolling
- Residual stresses from the rolling process
- Hardening effects of the material from cold forming
The experimental fatigue strength increases achieved were up to 63%. In combination with the findings from the additional tests, it is clear that the use of a generalised hardening factor is not satisfactory. A comparison of the strengthening factors according to DIN 743 and the FKM guideline shows the uncertainties in the design. As residual stresses are not taken into account in the nominal stress concepts of DIN 743 and FKM guideline, the result of the linear elastic equivalent stress amplitude of 1392 MPa in the notch cannot be determined. The potential of deep rolling becomes clear here.
- Surface roughness, which is generally reduced by deep rolling
- Residual stresses from the rolling process
- Hardening effects of the material from cold forming
The experimental fatigue strength increases achieved were up to 63%. In combination with the findings from the additional tests, it is clear that the use of a generalised hardening factor is not satisfactory. A comparison of the strengthening factors according to DIN 743 and the FKM guideline shows the uncertainties in the design. As residual stresses are not taken into account in the nominal stress concepts of DIN 743 and FKM guideline, the result of the linear elastic equivalent stress amplitude of 1392 MPa in the notch cannot be determined. The potential of deep rolling becomes clear here.
Details
Translated title of the contribution | Investigations into increasing the fatigue strength of shafts by deep rolling |
---|
Original language | German |
---|---|
Article number | 19 |
Journal | Forschung im Ingenieurwesen |
Volume | 88 |
Issue number | 1 |
Publication status | Published - 13 May 2024 |
Peer-reviewed | Yes |
Colloquium
Title | Dresden Colloquium on Machine Elements 2024 |
---|---|
Abbreviated title | DMK 2024 |
Duration | 14 - 15 May 2024 |
Degree of recognition | National event |
Location | HYPERION Hotel Dresden am Schloss |
City | Dresden |
Country | Germany |
External IDs
ORCID | /0000-0002-0517-7425/work/160046967 |
---|---|
ORCID | /0000-0003-3033-3343/work/160048733 |
ORCID | /0009-0006-9434-6943/work/160049518 |
Scopus | 85192866987 |