Local scuffing and damage progress of the tooth flank through micro pitting and pitting
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Full title: |
Local scuffing and damage progress of the tooth flank through micro pitting and pitting (according to FVA-projects 411, 516 und 519) |
| Duration: |
10/2013 – 02/2017 |
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Contributors: |
Dipl.-Ing. (FH) Marcus Merder, |
| Financing: |
Forschungsvereinigung Antriebstechnik (FVA) |
| Objective: | Micro pitting and pitting are characteristic fatigue damages on the tooth flank which lead to a change in the flank shape. As a result, the load and pressure distribution changes, whereby the damage modes and the development of damage can be significantly influenced. So far, the load capacity calculation in BECAL has only been carried out on the basis of the target topography of the flank. The aim of this project is to include the continuously variable flank topography caused by damage in the BECAL simulation in order to obtain a more realistic representation of the flank load capacity. In addition, the local scuffing load capacity according to KLEIN [FVA519] is implemented in BECAL as a supplement to the load capacity calculation. |
| Approach: | The basis of the simulation are the calculation approaches for determining the local load capacity with regard to pitting and micro pitting according to Wirth (FVA411) and Hombauer (FVA516). Furthermore, an approach for the calculation of the local flank deviation according to Hombauer (FVA516) is used. In order to simulate the progressing damage, the local load capacity and the partial damage (damage accumulation) of the tooth flank are calculated for discrete calculation steps. Based on this, the change in the flank topography due to damage is determined and integrated in the further simulation. To validate the damage simulation, tests were carried out on the bevel gear test rig. For this purpose, a measuring technique was developed which allows the measurement of the tooth flank deviation during the test run without unmounting the test gearbox. For this purpose, impressions of the tooth flank were made, which were optically scanned and evaluated afterwards. The optical measurement and evaluation was carried out in cooperation with the Chair of Design Engineering and CAD of the TUD under the direction of Prof. Dr.-Ing. Stelzer. |
| Results: | The damage simulation using BECAL is principally possible and delivers good results under certain restrictions. However, in view of a commercial use of the damage simulation and in order to statistically secure those results, further tests and validations are necessary. |
