研究目的
To predict the fatigue life at fillet radii step induced stress raiser regions on a high-speed gas turbine engine shaft by utilization of laser shock peening.
研究成果
The developed finite element model can be an appropriate tool to assist in the fatigue life estimation of laser shock peening applied to stress raisers. The modified laser shock peening simulation method provided accurate prediction of the residual stress field with a reduced computational time of over 68% compared to conventional methods. The fatigue life revealed an improvement of 553% due to laser shock peening, which is comparable to similar findings in the literature.
研究不足
The high computational costs involved in LSP simulations make it difficult to simulate multiple LSP on complex geometries. However, some studies where multiple LSP simulations was involved have considered alternative LSP simulation methods by introducing damping to reduce the computational time.
1：Experimental Design and Method Selection:
The study developed a more computational efficient finite element model to mimic the laser shock peening process on the fillet radii step induced stress raiser regions of a shaft. A modified laser shock peening simulation method for effective prediction of the residual stress field was introduced.
2：Sample Selection and Data Sources:
An existing micro gas turbine engine shaft’s geometric parameters were used. Each of the two fillet radii steps considered for this study, consists of a 0.2 mm radius at the turbine and compressor attachment sections, respectively.
3：2 mm radius at the turbine and compressor attachment sections, respectively.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The study employed Fe-safe fatigue software for fatigue life prediction and ABAQUS 6.20 software for the application of multiple LSP on two fillet radii induced stress raiser regions of a shaft geometry.
4：20 software for the application of multiple LSP on two fillet radii induced stress raiser regions of a shaft geometry.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: A static and dynamic analysis was performed on the shaft under steady-state conditions for fatigue life predictions. For comparative purposes, a fatigue analysis in Fe-safe software was performed for two scenarios, one for the shaft without LSP and a second one for the shaft with applied LSP.
5：Data Analysis Methods:
The Brown-Miller algorithm was selected for the Fe-safe calculation. The approach gives accurate results in the high cycle regime for complex torsional and axial load histories which is appropriate for ductile materials.
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