Development of a Numerical Procedure for Mixed Mode K-solutions and Fatigue Crack Growth in FCC Single Crystal Superalloys PDF Download
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Author: Srikant Ranjan
Publisher:
ISBN:
Category :
Languages : en
Pages :
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ABSTRACT: Fatigue-induced failures in aircraft gas turbine and rocket engine turbopump blades and vanes are a pervasive problem. Turbine blades and vanes represent perhaps the most demanding structural applications due to the combination of high operating temperature, corrosive environment, high monotonic and cyclic stresses, long expected component lifetimes and the enormous consequence of structural failure. Single crystal nickel-base superalloy turbine blades are being utilized in rocket engine turbopumps and jet engines because of their superior creep, stress rupture, melt resistance, and thermomechanical fatigue capabilities over polycrystalline alloys. These materials have orthotropic properties making the position of the crystal lattice relative to the part geometry a significant factor in the overall analysis.
Author: Srikant Ranjan
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
ABSTRACT: Fatigue-induced failures in aircraft gas turbine and rocket engine turbopump blades and vanes are a pervasive problem. Turbine blades and vanes represent perhaps the most demanding structural applications due to the combination of high operating temperature, corrosive environment, high monotonic and cyclic stresses, long expected component lifetimes and the enormous consequence of structural failure. Single crystal nickel-base superalloy turbine blades are being utilized in rocket engine turbopumps and jet engines because of their superior creep, stress rupture, melt resistance, and thermomechanical fatigue capabilities over polycrystalline alloys. These materials have orthotropic properties making the position of the crystal lattice relative to the part geometry a significant factor in the overall analysis.
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 848
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Author:
Publisher:
ISBN:
Category : Gas-turbines
Languages : en
Pages : 646
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Book Description
Author: H. Kitagawa
Publisher:
ISBN:
Category : Biaxial loading
Languages : en
Pages : 20
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Book Description
A comprehensive fracture mechanics study has been carried out on the fatigue crack growth under various biaxial stress conditions. Fatigue tests have been conducted on a high-cycle biaxial fatigue test facility and a cruciform flat specimen of a weldable structural steel with a center crack parallel to one load axis or a slant crack.
Author: S. J. Hudak
Publisher: ASTM International
ISBN: 9780803107175
Category : Technology & Engineering
Languages : en
Pages : 384
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Author: Richard E. Link
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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Most of the currently available methods for predicting fatigue crack growth in structures do not consider effects due to mixed-mode loading. This is partly due to the limited information available concerning the fatigue crack growth under mixed mode loading. Previous investigations of mixed mode effects on fatigue crack growth have shown that under combined opening and in-plane shear loading, the cracks turn abruptly so that the in-plane shear mode is eliminated. Very little data is generated before the crack curvature eliminates the mixed-mode loading. The changing orientation of the crack during the test makes analysis of the problem difficult and may cloud the intrinsic fatigue crack growth rate behavior under mixed-mode loading. Situations can exist in engineering structures in which cracks may grow in a self-similar manner, even under the influence of mixed-mode loading. Examples of such situations are radial cracks in bearing rates and transverse cracks in rotating shafts under shear and bending loads. The cracks may not change orientation because the in-plane shear component is fully reversed. It is necessary to understand the effects of mixed mode loading on fatigue crack growth in order to properly predict the behavior of these components. Mixed mode, Fatigue, Crack growth, Predictive models, Ni-Cr-Mo steel.
Author: Jack Telesman
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
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Author: VN. Shlyannikov
Publisher:
ISBN:
Category : Crack growth direction
Languages : en
Pages : 16
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Book Description
Elastic-plastic crack growth under mixed Mode I and II in six types of aluminum alloys and three types of steel were investigated. The experimental study of fatigue crack growth in six types of the aluminum alloys and one type of the steel is performed on biaxially loaded eight-petal specimens (EPS). All specimens for biaxial loading contained inclined through thickness central cracks. Mixed Mode I/II static and fatigue crack growth experiments on the three types of steels and one type of the aluminum alloy used compact tension shear (CTS) specimens. Two approaches are developed for geometrical modeling of crack growth trajectories for the central notched and compact tension shear specimens respectively. The principal feature of such modeling is the determination of crack growth direction and the definition of crack length increment in this direction. On the basis of the analysis of the experimental data for the aluminum alloys and the steels an empirical crack reorientation criterion is suggested for both brittle and ductile materials. The damage process zone size concept is used for calculations of mixed-mode crack path. The influence of specimen geometry, biaxial loading and properties of the aluminum alloys and the steels on both crack growth direction and crack path at the macroscopic scale is discussed.
Author: Oliver Richard Murphy
Publisher:
ISBN:
Category : Anisotropy
Languages : en
Pages : 122
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Book Description
Author: Jin Qian
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 400
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Book Description
