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Thursday, April 30, 2020 | History

2 edition of investigation of methods of reducing fatigue crack growth by artificial crack-closure effects. found in the catalog.

investigation of methods of reducing fatigue crack growth by artificial crack-closure effects.

Atiq-Ur Rehman

investigation of methods of reducing fatigue crack growth by artificial crack-closure effects.

by Atiq-Ur Rehman

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Published by University of Salford in Salford .
Written in English


Edition Notes

PhD thesis, Aeronautical and Mechanical Engineering.

SeriesD172427
ID Numbers
Open LibraryOL20306963M

Many of the recent advances in the understanding of the fatigue crack growth process have resulted from an improved realization of the importance of fatigue crack closure in the crack growth process. Two basic crack closure processes have been identified. One of which is known as plasticity-induced fatigue crack closure (PIFCC), and the other is roughness-induced fatigue crack closure (RIFCC).Cited by: 2. This International Standard is intended to provide specifications for generation of fatigue crack growth rate data. Test results are expressed in terms of the fatigue crack growth rate as a function of crack-tip stress-intensity factor range,? K, as defined by the theory of linear elastic fracture mechanics -. Expressed in these terms the.

Fatigue Crack Growth Rate Model for Metallic Alloys R. C. Dimitriu and H. K. D. H. Bhadeshia Abstract. 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, . A recent mixed-mode fatigue crack growth model based on the dilatational component of the accumulated strain energy density near the crack tip is modified to quantify the retardation factor of crack growth rate following an overload. It is found that crack branching due to an overload results in considerable reduction of fatigue crack growth rate.   Chen). Studies of fatigue crack closure (D. François). Fatigue threshold of metallic materials - a review (A. Hadrboletz et al.). Mechanics of fatigue crack growth as a synthesis of micro- and macro-mechanics of fracture (V.V. Bolotin). Random material non-homogeneity effects on fatigue crack growth (K. Doliński). Volume Edition: 1.

Fatigue crack growth experiments and analyses The crack closure levels are taken into con- and the project goal was stated as ”To develop methods whereby complex fatigue crack 1Abbreviationfor: LicentiateofEngineeringdegree. Swedishtranslation: Teknologie licentiat NUMERICAL INVESTIGATIONS OF THE FATIGUE CRACK GROWTH UNDER SERVICE LOADING H.A. Richard, M. Sander University of Paderborn, Institute of Applied Mechanics Pohlweg , D Paderborn, Germany [email protected] Abstract During the fatigue crack growth acceleration and retardation effects occur due to service loadings. Paris' law (also known as the Paris–Erdogan equation) is a crack growth equation that gives the rate of growth of a fatigue crack. The stress intensity factor characterises the load around a crack tip and the rate of crack growth is experimentally shown to be a function of the range of stress intensity seen in a loading cycle. The Paris equation is = ().


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Investigation of methods of reducing fatigue crack growth by artificial crack-closure effects by Atiq-Ur Rehman Download PDF EPUB FB2

SyntaxTextGen not activatedP-texture effect on the fatigue pdf propagation (FCP) resistance in an Al-Cu-Mg alloy containing a pdf amount of Ag, is investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electron back scattering diffraction (EBSD).

Results shows that the high intensity P-texture sheet has lower σ / σ b, lower FCP rate Cited by: 2.and load ratio. However, crack closure cannot be used to explain the overload-induced retardation effects download pdf in this work under plane-strain, where both crack arrest and delays were associated to anincrease in Keff.

These results indicate that the dominant role of crack closure in the modeling of fatigue crack growth should be reviewed. Fatigue crack growth behavior of a ebook solution-strengthened nickel-base superalloy (Incoloy )* was ebook.

The investigation also examined the influence of heat treatment on resultant microstructures and the near-threshold fatigue crack growth behavior. In addition, the influence of load ratios(R), material strength, and grain size on fatigue threshold was by: 7.