Micro-crack growth behavior and life in high temperature low cycle fatigue of blade root and disc joint for turbines

Isobe, Nobuhiro; Nogami, Shuhei

doi:10.1016/j.ijpvp.2009.04.009

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…To analytically and numerically resolve the microcrack activities, Mu et al applied electron backscattered diffraction technique (EBSD) and observed the microcrack initiation on the surface of grains in the central zone of the fatigue specimen . Isobe et al found locally distributed microcrack at the size of 0.1 mm . Abuzaid et al quantitatively assessed the correlation between strain localization and fatigue micro‐crack lengths .…”

Section: Introductionmentioning

confidence: 99%

“…Abuzaid et al quantitatively assessed the correlation between strain localization and fatigue micro‐crack lengths . Recently, there are several approaches dedicatedly to investigate the microcracks using nondestructive methods, such as time‐reversed nonlinear guided waves, nonlinear Rayleigh surface waves, Ultrasonic, temperature evolution, and advanced light source including neutron and synchrotron x‐ray . Gussone et al demonstrated the advantage of the advanced photon source to apply in‐situ measurements to investigate the fatigue microcrack behaviour on the composites .…”

Section: Introductionmentioning

confidence: 99%

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Fatigue induced deformation and thermodynamics evolution in a nano particle strengthened nickel base superalloy

Huang

Chang

Liaw

et al. 2016

Fatigue Fract Eng Mat Struct

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In‐situ neutron‐diffraction and temperature measurements were simultaneously applied to investigate low‐cycle‐fatigue behaviour of a nano‐precipitate strengthened nickel‐based superalloy. Two transitions in the temperature‐evolution are observed subjected to cyclic loading. Two models are compared with the measured temperature evolution. One is based on bulk stress, and the other is based on lattice‐strain evolution. The calculated thermoelastic responses in both models qualitatively agree with the measured bulk‐temperature evolution for the first transition. The in‐situ neutron‐diffraction results reveal that the first transition is associated with the cyclic hardening/softening dislocation‐structural transformation. However, the second transition, which is observed at larger number of fatigue cycles during the steady cycles, does not correlate with the dislocation evolution. A phenomenological model is applied to describe the second temperature‐transition stages. The energy dissipation evolutions in the second fatigue stage indicate the initiation and the growth activities of fatigue microcrack. The data reported here may be useful for cohesive zone model.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fatigue induced deformation and thermodynamics evolution in a nano particle strengthened nickel base superalloy

Huang

Chang

Liaw

et al. 2016

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

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“…Stress analysis is the primary step which has to be performed in order to start fracture mechanics analysis. Several investigations into stress analysis of fir-tree region in disc assemblies are carried out in the past [2][3][4][5][6][7][8][9][10][11]. In all these past investigations the contact between blade and disc is modeled with details.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Fir-Tree Blade-Disc Assembly

Dargahi

Masoudi

Nakhodchi

2013

AMM

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The safe operation of industrial gas turbines is dependent on the structural integrity of the critical geometrical features such as blade-disc attachments. Knowledge of stress distribution in this region is the principal necessity for damage tolerance analysis and lifetime estimations. The finite element analysis which includes contact between two deformable bodies is complicated and takes extensive computational costs. A simplified FE model is needed which could predict the stress distribution without modeling the exact contact features. The main objective of this study is to present and compare two simplified FE models which can predict stress distribution at blade disc interface. Fir-tree region in a gas turbine disc assembly is modeled and comprehensive 2D and 3D non-linear finite element analysis is carried out. FE results are verified using photo elasticity method.

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