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Thursday, April 23, 2020 | History

3 edition of Environmental fatigue of an Al-Li-Cu alloy. found in the catalog.

Environmental fatigue of an Al-Li-Cu alloy.

Robert S. Piascik

Environmental fatigue of an Al-Li-Cu alloy.

  • 112 Want to read
  • 35 Currently reading

Published by National Aeronautics and Space Administration, Langley Research Center, For sale by the National Technical Information Service in Hampton, Va, [Springfield, Va .
Written in English

    Subjects:
  • Aluminum-lithium alloys -- Fatigue.,
  • Aluminum-copper alloys -- Fatigue.

  • Edition Notes

    StatementRobert S. Piascik and Richard P. Gangloff.
    SeriesNASA technical memorandum -- 107619.
    ContributionsGangloff, R. P., Langley Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15366798M

    Practical applications and examples of fracture control in weldments, process piping, aircraft systems, and high-temperature crack growth and thermos-mechanical fatigue are also included. For information on the print version of Volume 19, ISBN , follow this link. Proceedings of the Fifth International Conference on the Effect of Hydrogen on the Behavior of Materials sponsored by the Structural Materials Division (SMD) Mechanical Metallurgy and Corrosion & Environmental Effects Committees of The Minerals, Metals & Materials Society held at Jackson Lake Lodge, Moran, Wyoming, September , Print book: Conference publication: Session I Overview of Temperature and Environmental Effects of Fatigue.- Overview of Temperature and Environmental Effects of Fatigue of Structural Metals.- The Effect of Environment and Temperature on the Fatigue Behavior of Titanium Alloys.- Creep-Fatigue-Effects in Composites.- Session VII Design. This article summarizes the metallurgical and environmental variables that affect fracture toughness, fatigue life, and subcritical crack growth of titanium alloys, such as chemistry, microstructure, texture, environment, and loading.


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Environmental fatigue of an Al-Li-Cu alloy. by Robert S. Piascik Download PDF EPUB FB2

Dec 01,  · Microscopic fatigue crack propagation (FCP) paths in peak-aged unrecrystallized alloy are identified as functions of intrinsicda/dN- δK kinetics and environment.

The FCP rates in longitudinal-transverse (LT)-oriented are accelerated by hydrogen-producing environments (pure water vapor, moist air, and aqueous NaCl), as defined in Part I.

Subgrain boundary cracking (SGC) Cited by: Environmental fatigue of an Al-Li-Cu alloy: Part II. Microscopic hydrogen cracking processes Piascik, Robert S.; Gangloff, Richard P.

Abstract. Microscopic fatigue crack propagation (FCP) paths in peak-aged unrecrystallized alloy are identified as functions of intrinsic da/dN- Cited by: Oct 01,  · Deleterious environmental effects on steady-state, intrinsic fatigue crack propagation (FCP) rates(da/dN) in peak-aged Al-Li-Cu alloy are established by electrical potential monitoring of short cracks with programmed constant ΔK andK maxI loading.

Such rates are equally unaffected by vacuum, purified helium, and oxygen but are accelerated in order of decreasing effectiveness by aqueous 1 pct NaCl Cited by: Deleterious environmental effects on steady-state, intrinsic fatigue crack propagation (FCP) rates (da/dN) in peak-aged Al-Li-Cu alloy are established by electrical potential monitoring of short cracks with programmed constant ΔK and K maxI loading.

Such rates are equally unaffected by vacuum, purified helium, and oxygen but are accelerated in order of decreasing effectiveness by aqueous 1 pct NaCl.

Abstract Based on a fractographic analysis of fatigue crack propagation (FCP) in Al-Li-Cu alloy stressed in a variety of inert and embrittling environments, microscopic crack paths are identified and correlated with intrinsic da/dN-delta K kinetics.

Abstract Environmental fatigue crack propagation rates and microscopic damage modes in Al-Li-Cu alloy (Parts 1 and 2) are described by a crack tip process zone.

Growth behavior of small fatigue cracks in Al Li Cu alloys. Author links open overlay panel M.R. James. Show moreCited by: Environmental fatigue at moderate 4K produced facets along {} and {} in and series aluminum alloys [11, 26, 27, 30, 56, 57], as well as in Al-Li alloys [9, 12].

Brittle fatigue striations in series aluminum alloys involved facets parallel to {}, {} or both planes [59, 66, 67].Cited by: In general the fatigue properties, notably the notched HCF resistances, of Al–Li alloys are similar to those of conventional aerospace aluminium alloys.

Alloy development programs on newer Al–Li alloys aim to study further the effects of minor alloying additions (rare earths, beryllium, Cited by: 1.

aluminum alloys, steels and titanium-based alloys [PET 91]. The low dist ribution in all the alloys comes from the values of D 0 *, which poorly depends on the natur e ofAuthor: J. Petit. Low cycle fatigue (LCF) resistance data from binary Al–Li, ternary Al–Li–Cu, and quaternary Al–Li–Cu–Mg alloys have been compiled and discussed.

Limited data suggest that the 'chemically small crack' effect, observed in other alloy system, is not pronounced in Al-Li alloys.

Modeling of environmental fatigue in Al-Li-Cu alloys related accelerated fatigue crack growth in moist air and salt water to hydrogen embrittlement.

Jul 18,  · Environmental fatigue resistance is comparable with series alloys and better than type alloys. The accelerated growth of small fatigue cracks, strong anisotropy, poor short-transverse properties, and a sensitivity to compression overloads are the principal disadvantages of Al-Li coinclassifier.club by: Keywords: Al-Li-Cu-Mg-Zr alloys, retrogression and reaging (RRA), anodic and cathodic potentials, environmental induced cracking (EIC).

Abstract Stress corrosion cracking (SCC) behaviour of and Al-Li-Cu-Mg-Zr alloys of peak superior resistance to fatigue and. Add tags for "Environmental fatigue of an Al-Li-Cu alloy. Part II, Microscopic hydrogen cracking processes". Part II, Microscopic hydrogen cracking processes".

Be the first. The fatigue crack-growth resistance is shown to be significantly lessened in ambient air. This is due to a lack of complementary shielding from oxide-induced closure in conjunction with an environmental enhancement of fatigue damage at the crack tip.

Gaseous environmental effects on intrinsic fatigue crack growth are significant for the Al-Li-Cu alloypeak aged. For both moderate δK-low R and low δK-high R regimes, crack growth rates decrease according to the environment order: purified water vapor, moist air, helium and coinclassifier.club by: 1.

Add tags for "Environmental fatigue of an Al-Li-Cu alloy. Part III, Modeling of crack tip hydrogen damage". Part III, Modeling of crack tip hydrogen damage".

Be the first. Controlling Environmental Fatigue in Aerospace Al Alloys by Multiscale Crack Tip Measurements and Modeling based on multiple measurements on an oriented Si single crystal and an Al–Li–Cu.

Abstract. Deleterious environmental effects on steady-state, intrinsic fatigue crack propagation (FCP) rates (da/dN) in peak aged Al-Li-Cu alloy are established by electrical potential monitoring of short cracks with programmed constant delta K and K(sub max) coinclassifier.club: Richard P.

Gangloff and Robert S. Piascik. Fatigue damage represents one of the most important types of damage to which structural materials are subjected in normal industrial services that can finally result in a sudden and unexpected abrupt fracture. Since metal alloys are still today the most used.

In this study, fatigue crack propagation behavior has been examined in a commercial thin plate of Al-Li-Cu-Mg alloy (), with specific emphasis at the fatigue threshold. Crystallographic orientation relationships among η-Ni 3 Ti precipitate, reverted austenite, and martensitic matrix in FeCrNi-2W maraging alloy Jin I.

Suk, Soon H. Hong, Soo W. Nam Pages Cyclic and SCC behavior of Alloy HAZ in a PWR environment The results indicate little or no environmental enhancement of fatigue CGRs of Alloy weld metal in the PWR environment.

Failures can usually be attributed to fatigue, corrosion, erosion, or static over-pressurization, with fatigue and corrosion the most troublesome, according to service data [1]. At present, there are no data available on the effect of environment, temperature, frequency, or other conditions on the fatigue life of the aluminum alloy Author: R.

Roberts, K. Wnek, J. Tafuri. The following projects are addressed: environmental fatigue of Al-Li-Cu alloys; mechanisms of localized corrosion and environmental fracture in Al-Cu-Li-Mg-Ag alloy X and compositional variations; the effect of zinc additions on the precipitation and stress corrosion cracking behavior of alloy ;more» «less.

higher fatigue strengths than aluminum alloys with MPa (70 ksi) yield strengths. A com-parisonoftheS-Ncurvesforsteelandaluminum isshowninFigNotethatsteelnotonlyhas a higher fatigue strength than aluminum, but it also has an endurance limit.

Below a certain stress level, the steel alloy will never fail due to cyclic loading alone. Oct 18,  · Fatigue of Materials covers a broad spectrum of topics that represent the truly diverse nature of the subject that has grown to become a key area of scientific and applied research.

Constituting an international forum for the materials industry, the book provides the perspectives of operators, engineers, and researchers regarding all aspects of current and emerging technologies for materials.

The influences of microstructure and deformation mode on inert environment intrinsic fatigue crack propagation were investigated for Al-Li-Cu-Mg alloys AA, AA Note: Citations are based on reference standards.

However, formatting rules can vary widely between applications and fields of interest or study. The specific requirements or preferences of your reviewing publisher, classroom teacher, institution or organization should be applied. Environmental fatigue of an Al-Li-Cu alloy. Part 2: Microscopic hydrogen cracking processes.

By Robert S. Piascik and Richard P. Gangloff. Abstract. Based on a fractographic analysis of fatigue crack propagation (FCP) in Al-Li-Cu alloy stressed in a variety of inert and embrittling environments, microscopic crack paths are identified and Author: Robert S.

Piascik and Richard P. Gangloff. The fatigue behavior of aluminum alloys is greatly influenced by testing environment. In this paper, the role of dry air and highly purified moisture on fatigue crack growth behavior of Al alloy Cited by: 1.

Abstract. Deleterious environmental effects on steady-state, intrinsic fatigue crack propagation (FCP) rates (da/dN) in peak aged Al-Li-Cu alloy are established by electrical potential monitoring of short cracks with programmed constant delta K and K(sub max) loading.

In addition, it explores the environmental effects of corrosion fatigue, low-temperature fatigue, high-temperature fatigue, and thermal fatigue. Finally, the chapter discusses a number of design philosophies or methodologies to deal with design against fatigue failures.

Environmental effects on fatigue crack growth in aluminum alloy. In Fatigue of Materials: Advances and Emergences in Understanding, Held During Materials Science and TechnologyMS and T'10 (pp. )Cited by: 1. The full text of this article hosted at coinclassifier.club is unavailable due to technical difficulties.

Owing to the low density, high strength, and excellent fatigue crack resistance, Al-Cu-Li alloys have received increasing attention during the last two decades [5,6,7,8,9,10].

Being the lightest metallic element in the nature, lithium contributes to 6% increase in elastic modulus and 3% decrease in weight for aluminum alloys by adding 1 wt.% of Cited by: 3.

The book initiates with a systematic description of fatigue from a phenomenological point of view, since the early signs of submicroscopic damage in few surface grains and continues describing, step by step, how these precursors develop to become mechanically small cracks and, eventually, macrocracks whose growth is governed by fracture mechanics.

Deleterious environmental effects on steady-state, intrinsic fatigue crack propagation (FCP) rates (da/dN) in peak aged Al-Li-Cu alloy are established by electrical potential monitoring of short cracks with programmed constant delta K and K(sub max) loading.

fatigue life models used to estimate the fatigue curves as a function of those parameters, and presented a procedure for incorporating environmental effects into fatigue evaluations.

In this revision, additional fatigue ε-N data available since the original publication of this report, most. Upon exposure to aggressive environments, the fatigue crack propagation resistance can be detrimentally affected.

R. Piascik and R. Gangloff found enhanced cyclic crack growth rates in an Al-Li-Cu alloy when a critical water vapor pressure was exceeded.Fatigue crack propagation behaviour in Al-Li alloy plate were studied in four main testing environments: a relatively inert environment - desiccated air; and three freely corroding aqueous environments consisting of distilled water, M NaCl and 1 M AlCl₃.

It was found that the major role of the aqueous environments in the T-L orientation crack growth behaviour of the Al-Li alloy.EFFECTS OF LWR COOLANT ENVIRONMENTS ON FATIGUE DESIGN CURVES OF CARBON AND LOW-ALLOY STEELS by 0.

K. Chopra and W. J. Shack Abstract The ASME Boiler and Pressure Vessel Code provides rules for the construction of nuclear.