Details
| Original language | English |
|---|---|
| Title of host publication | ASME Turbo Expo 2020 |
| Subtitle of host publication | Turbomachinery Technical Conference and Exposition |
| Publisher | American Society of Mechanical Engineers(ASME) |
| Number of pages | 7 |
| ISBN (electronic) | 9780791884225 |
| Publication status | Published - 11 Jan 2021 |
| Event | ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition, GT 2020 - online, Virtual, Online Duration: 21 Sept 2020 → 25 Sept 2020 |
Publication series
| Name | Proceedings of the ASME Turbo Expo |
|---|---|
| Volume | 10B-2020 |
Abstract
Patching is a high-tech repair procedure that is very adequate for compressor blisks with larger damages. This repair concept has the advantage that the added patch provides the same mechanical strength as the parent material of the blade and the initial aerodynamic contour of the blade is fully restored. However, the welding process locally induces stresses in the heat affected zone at the patch-to-blisk interface. These welding residual stresses influence the fatigue life of the repaired blade and have to be considered during the design phase of patch repairs. In this work, we contribute to the design of patch repairs by introducing a numerical simulation to predict weld-induced stresses in repaired compressor blades. Therefore, a finite element model is developed that includes sequential thermal and mechanical analyses of blisk blades. The temperature field caused by the welding torch is determined by performing a transient heat transfer analysis. The model also reflects the changes in the geometry due to the additional patch material and subsequent re-contoured patch. Different patch geometries are evaluated and compared in terms of their resulting stress levels. Basically, two kinds of patch geometries with long and short welding seams are studied. The stationary stress distribution of the repaired blade results from the superposition of residual stresses with steady stresses due to rotational and pressure forces. Thus, we provide the basis for a new fatigue assessment of the repaired blade considering the residual stress level in the patch-to-blisk interface.
ASJC Scopus subject areas
- Engineering(all)
- General Engineering
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ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers(ASME), 2021. GT2020-14659 (Proceedings of the ASME Turbo Expo; Vol. 10B-2020).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Numerical study of welding residual stresses in blisk repairs by patching
AU - Berger, Ricarda
AU - Hofmeister, Benedikt
AU - Gebhardt, Cristian G.
AU - Rolfes, Raimund
N1 - Funding information: The authors kindly thank the German Research Foundation (DFG) for the financial support to accomplish the research project B4 ”Dynamical Behavior and Strength of Structural Elements with Regeneration-induced Imperfections” within the Collaborative Research Center (CRC) 871 - Regeneration of Complex Capital Goods.
PY - 2021/1/11
Y1 - 2021/1/11
N2 - Patching is a high-tech repair procedure that is very adequate for compressor blisks with larger damages. This repair concept has the advantage that the added patch provides the same mechanical strength as the parent material of the blade and the initial aerodynamic contour of the blade is fully restored. However, the welding process locally induces stresses in the heat affected zone at the patch-to-blisk interface. These welding residual stresses influence the fatigue life of the repaired blade and have to be considered during the design phase of patch repairs. In this work, we contribute to the design of patch repairs by introducing a numerical simulation to predict weld-induced stresses in repaired compressor blades. Therefore, a finite element model is developed that includes sequential thermal and mechanical analyses of blisk blades. The temperature field caused by the welding torch is determined by performing a transient heat transfer analysis. The model also reflects the changes in the geometry due to the additional patch material and subsequent re-contoured patch. Different patch geometries are evaluated and compared in terms of their resulting stress levels. Basically, two kinds of patch geometries with long and short welding seams are studied. The stationary stress distribution of the repaired blade results from the superposition of residual stresses with steady stresses due to rotational and pressure forces. Thus, we provide the basis for a new fatigue assessment of the repaired blade considering the residual stress level in the patch-to-blisk interface.
AB - Patching is a high-tech repair procedure that is very adequate for compressor blisks with larger damages. This repair concept has the advantage that the added patch provides the same mechanical strength as the parent material of the blade and the initial aerodynamic contour of the blade is fully restored. However, the welding process locally induces stresses in the heat affected zone at the patch-to-blisk interface. These welding residual stresses influence the fatigue life of the repaired blade and have to be considered during the design phase of patch repairs. In this work, we contribute to the design of patch repairs by introducing a numerical simulation to predict weld-induced stresses in repaired compressor blades. Therefore, a finite element model is developed that includes sequential thermal and mechanical analyses of blisk blades. The temperature field caused by the welding torch is determined by performing a transient heat transfer analysis. The model also reflects the changes in the geometry due to the additional patch material and subsequent re-contoured patch. Different patch geometries are evaluated and compared in terms of their resulting stress levels. Basically, two kinds of patch geometries with long and short welding seams are studied. The stationary stress distribution of the repaired blade results from the superposition of residual stresses with steady stresses due to rotational and pressure forces. Thus, we provide the basis for a new fatigue assessment of the repaired blade considering the residual stress level in the patch-to-blisk interface.
UR - http://www.scopus.com/inward/record.url?scp=85099878796&partnerID=8YFLogxK
U2 - 10.1115/GT2020-14659
DO - 10.1115/GT2020-14659
M3 - Conference contribution
AN - SCOPUS:85099878796
T3 - Proceedings of the ASME Turbo Expo
BT - ASME Turbo Expo 2020
PB - American Society of Mechanical Engineers(ASME)
T2 - ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition, GT 2020
Y2 - 21 September 2020 through 25 September 2020
ER -