Characterization of residual stresses in turbine discs by neutron and high-energy X-ray diffraction and comparison to finite element modeling

Cihak, Ulrike; Staron, Peter; Clemens, Helmut; Homeyer, J.; Stockinger, Martin; Tockner, J.

doi:10.1016/j.msea.2006.04.049

Cited by 34 publications

(14 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is a surprising result since disc like geometries are only expected to have significant non-zero axial stress in the rim region, due to edge effects [24]. The issue of non-zero axial stress in disc like geometries has been discussed in the literature [25], and suggested to be the result of residual microstress built up in a particular reflection. Microstresses develop in polycrystalline materials due to elastic and plastic anisotropy.…”

Section: Resultsmentioning

confidence: 99%

Residual Stress Evolution during Manufacture of Aerospace Forgings

Rolph¹,

Preuss²,

Iqbal³

et al. 2012

Superalloys 2012 (Twelfth International Symposium)

View full text Add to dashboard Cite

The residual stresses present through the quenching, ageing, and machining processes in sub-scale forgings of RR1000 have been measured experimentally using neutron diffraction, and the contour method. The forgings, 88.9mm in diameter, and 25.4-50.8mm thickness, were of small enough geometry to allow neutron strain measurement in 3 directions throughout most of the bulk. The contour method was employed successfully to generate a full 2D map of the hoop stress in the as-aged and machined samples. The two experimental data sets have been shown to agree very well. Finite element modelling predictions based on an experimentally derived heat transfer coefficient (HTC) curve allowed further comparison and generated additional data. Agreement between the experimental and simulated data was found to be reasonable with some discrepancy visible in the axial direction. The water quenching process was found to generate peak stresses up to 1400MPa in the hoop and radial direction, which were relaxed by as much as 700MPa through ageing. Material removal by machining had a less significant impact in most cases, relaxing residual stress by 100-200MPa.

show abstract

Section: Resultsmentioning

confidence: 99%

Residual Stress Evolution during Manufacture of Aerospace Forgings

Rolph¹,

Preuss²,

Iqbal³

et al. 2012

Superalloys 2012 (Twelfth International Symposium)

View full text Add to dashboard Cite

show abstract

“…The coefficients of the polynomial can be solved by MATLAB program, then we can obtain the fitting function: (2) In the function, x is the angular velocity of the turbine disk, and the maximum equivalent compressive stress at any velocity can be obtained via the Eq.2.…”

Section: Finite Element Modeling and Stress Analysismentioning

confidence: 99%

“…Song et al [1] with the finite element method. In literature [2,3,4], they conducted the residual stress distribution simulation by using a finite element model. R. Jiang et al [5] studied the phenomenon of crack in turbine disk alloy by the temperature test, and calculated the fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Stress and Natural Mode for Micro Aero-engine Turbine Disk

Ding¹,

Jia²,

Li³

2016

Proceedings of the 2016 6th International Conference on Mechatronics, Computer and Education Informationization (MCEI 2016)

View full text Add to dashboard Cite

Keywords:Turbine disk；Stress；Natural mode of vibration；Finite element；Least square method.Abstract. In this paper, finite element stress analysis of a micro aero-engine turbine disk with different rotational forces is performed by applying Solidworks and Abaqus. Maximum safe speed of aero-engine is calculated and verificated according to the finite element analysis results. Then maximum stresses in different speeds can be calculated. Natural mode of turbine disk-blade system which is constrained by connecting hole is analyzed, and the first six order inherent frequencies and modal shapes are obtained. Stress analysis provides a theoretical basis for aero-engine speed control, design and optimization of turbine disk. The inherent mode lays the foundation for aero-engine transient analysis, spectral analysis and dynamic analysis.

show abstract

“…Again material data like low strain rate flow curves and elastic temperature dependent material data as well as an accurate description of heat transfer during cooling process are the key factors for a prediction of residual stresses. Figure 5 shows a comparison between FE-simulations of a water quenching process of an axisymetric part made of alloy 718 using a constant heat transfer coefficient of 4000 W/m²K as well as heat transfer coefficients varying with time or with temperature respectively, and neutron diffraction measurement [12,13]. Considering the measurement error of neutron diffraction of approximately ± 50 MPa and the simplification of an axisymetric model including a stepped change of the heat transfer coefficient to describe the change of cooling media the accuracy of the model is highly satisfying.…”

Section: Effect Of Residual Stresses On Dimensional Qualitymentioning

confidence: 99%

Effect of Process Modeling on Product Quality of Superalloy Forgings

Stockinger¹,

Huber²,

Riedler³

2010

7th International Symposium on Superalloy 718 and Derivatives (2010)

Self Cite

View full text Add to dashboard Cite

Even so effects of forming, heating and cooling on microstructure and therefore mechanical properties are well understood for superalloys like alloy 718 the influence of complex multistep thermomechanical processes can not be described analytically. Thus the usage of simulation tools is a necessity in order to secure stable processes and resulting properties. With increasing computer power and the development of the finite element method it is today possible to simulate these processes with high accuracy in a sufficient time period. Typical simulation results like optimization of material input, a guaranteed die filling as well as prevention of folding or overheating will be part of the paper. In addition the benefits of recent developments on residual stress and distortion simulation as well as microstructure and nanostructure models and their influences on mechanical properties will be discussed. Finally some simulation examples including process variations and their effects on the quality of parts will be compared with results of microstructure evaluation and mechanical testing of forgings. Using these simulation approaches linked with recent developments on fatigue modeling, it is possible to obtain minimized weight and maximized lifetime in the final part and therefore optimize the total life cycle costs.

show abstract

Characterization of residual stresses in turbine discs by neutron and high-energy X-ray diffraction and comparison to finite element modeling

Cited by 34 publications

References 15 publications

Residual Stress Evolution during Manufacture of Aerospace Forgings

Residual Stress Evolution during Manufacture of Aerospace Forgings

Finite Element Analysis of Stress and Natural Mode for Micro Aero-engine Turbine Disk

Effect of Process Modeling on Product Quality of Superalloy Forgings

Contact Info

Product

Resources

About