The unusual near-threshold FCG behavior of a single crystal superalloy and the resolved shear stress as the crack driving force

Telesman, Jack; Ghosn, Louis J.

doi:10.1016/0013-7944(89)90279-8

Cited by 66 publications

(51 citation statements)

References 6 publications

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“…However, it was noted, e.g., in [33,34], that for fatigue cracks in monocrystals the SIF ranges are not the parameters adequately reflecting the physics of the fatigue damage accumulation process. Therefore, Chen and Liu [33] suggested that the SIF ranges in the Paris equations should be replaced by the range of K rss (resolved shear stresses), …”

Section: Calculation Of Thermal Fatigue Crack Growth Kinetics In a Blmentioning

confidence: 96%

Methods of Computational Determination of Growth Rates of Fatigue, Creep, and Thermal Fatigue Cracks in Poly- and Monocrystalline Blades of Gas Turbine Units

Семенов

Semenov

Getsov³

2015

Strength Mater

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The crack growth kinetics of fatigue, creep, and thermal fatigue cracks in blades of gas turbine units is studied through a direct three-dimensional finite-element stepwise modeling of the crack propagation process. Prediction of crack growth rate involves the use of the criteria based on stress intensity factors (or J-integrals) for fatigue cracks, on C * -integrals for creep cracks, and on a combination of stress intensity factors (or J-integrals) and C * -integrals for thermal fatigue cracks. The authors discuss the methods for determination of fatigue life of polycrystalline blades as well as some special features of calculations of the crack growth kinetics in monocrystalline blades. The paper presents some examples of results of finite-element calculations of the fatigue, creep, and thermal fatigue crack growth processes in rotating blades of gas turbine units.

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Section: Calculation Of Thermal Fatigue Crack Growth Kinetics In a Blmentioning

confidence: 96%

Methods of Computational Determination of Growth Rates of Fatigue, Creep, and Thermal Fatigue Cracks in Poly- and Monocrystalline Blades of Gas Turbine Units

Семенов

Semenov

Getsov³

2015

Strength Mater

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“…Calculations for three nickel-base superalloys Udimet 700, Inconel 718 and Waspaloy; their detailed compositions can be found in [33][34][35][36][37]. Fig.…”

Section: Ni Ti and Al Alloysmentioning

confidence: 99%

“…5 compares the model and the experimental data using the inputs listed in Table 2. The calculations are represented with the uncertainty range and the reported measurements [33][34][35][36][37] as points. The results are fascinating since the model correctly estimates the Paris slopes, although it marginally overestimates the fatigue behaviour (we have checked that this overestimation is not explained by modulus variations between the different materials).…”

Section: Ni Ti and Al Alloysmentioning

confidence: 99%

Fatigue crack growth rate model for metallic alloys

Dimitriu

Bhadeshia

2010

Materials & Design

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A model has been created to allow the quantitative estimation of the fatigue crack growth rate in steels as a function of mechanical properties, test-specimen characteristics, stress-intensity range and test-frequency. With this design, the remarkable result is that the method which is based on steels, can be used without modification, and without any prior fatigue test, to estimate the crack growth rates in nickel, titanium and aluminium alloys. It appears therefore that a large proportion of the differences in the fatigue crack growth rate of metallic alloys can be explained in terms of the macroscopic tensile properties of the material rather than the details of the microstructure and chemical composition.

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“…Although literature has commented that the crack driving force in SCN materials are the resolved shear stresses and not the crystal plane normal stresses [17], the normal stress range on each octahedral plane and cube plane can also be calculated for completeness. Therefore, the fretting damage is also compared t o the normal stress range on the 'j-th' crystal plane, ACT:, calculated as:…”

Section: 308mentioning

confidence: 99%

“…It has been observed that failure on the (111) octahedral planes is governed by the behavior of the resolved shear stresses and not the maximum principal stresses [17]. However, the normal stress (mode I stress component) is thought to phy a, role in the failure process since the crack tip must remain open to allow fatigue and fracture to occur [18].…”

Section: 308mentioning

confidence: 99%

Prediction of fretting crack location and orientation in a single crystal nickel alloy

Matlik

Farris²,

Haynes

et al. 2009

Mechanics of Materials

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Fretting is a structural damage mechanism arising between two nominally clamped surfaces subjected to an oscillatory loading. A critical location for fretting induced darnage has been identified at the blade/disk and blade/damper interfaces of gas turbine engine turbomachinery and space propulsion components. The hightemperature, high-frequency loading environment seen by these components lead to severe stress gradients at the edge-of-contact that could potentially foster crack growth leading to component failure. These contact stresses drive crack nucleatioii in fretting and are very sensitive to the geometry of the contacting bodies, the contact loads, materials, temperature, and contact surface tribology (friction). Recently, a high-frequency, high-temperature load frame has been designed for experimentally investigating fretting damage of single crystal nickel materials employed in aircraft and spacecraft turbomachinery. A modeling method for characterizing the fretting stresses of the spherical fretting contact stress behavior in this experiment is developed and described. The calculated fretting stresses for a series of experiments are then correlated to the observed fretting damage. Results show that knowledge of the normal stresses and resolved shear stresses on each crystal plane can aid in predicting crack locations and orientations.

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The unusual near-threshold FCG behavior of a single crystal superalloy and the resolved shear stress as the crack driving force

Cited by 66 publications

References 6 publications

Methods of Computational Determination of Growth Rates of Fatigue, Creep, and Thermal Fatigue Cracks in Poly- and Monocrystalline Blades of Gas Turbine Units

Methods of Computational Determination of Growth Rates of Fatigue, Creep, and Thermal Fatigue Cracks in Poly- and Monocrystalline Blades of Gas Turbine Units

Fatigue crack growth rate model for metallic alloys

Prediction of fretting crack location and orientation in a single crystal nickel alloy

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