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Wednesday, August 5, 2020 | History

2 edition of Small-crack effects in high-strength aluminum alloys found in the catalog.

Small-crack effects in high-strength aluminum alloys

Small-crack effects in high-strength aluminum alloys

a NASA/CAE cooperative program

  • 104 Want to read
  • 1 Currently reading

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

    Subjects:
  • Aluminum alloys.

  • Edition Notes

    StatementJ.C. Newman, Jr. ... [et al.].
    SeriesNASA reference publication -- 1309.
    ContributionsNewman, J. C., Langley Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15398757M

    As a result, fatigue small crack initiation and propagation behavior, and relative several central issues dealing with the effects of some factors (temperature, notch and pores etc.) on the fatigue cracking behaviors and life of cast magnesium alloys (including AZ91D, AZ91, AM60B, AM60 and AM50) were investigated by the different experimental Author: Xi-Shu Wang. Contents include: Complete coverage of SCC for a variety of materials and SCC in different environments: carbon and low-alloy steels high-strength steels stainless steels nickel-base alloys copper alloys aluminum alloys magnesium alloys titanium alloys zirconium alloys uranium alloys amorphous alloys glasses and ceramics weldments in boiling water reactor service.

    Air Force Aging Aircraft Program This chapter provides (1) a discussion of the Aging Aircraft Technologies Team (AATT), which was formed in response to the NRC study on U.S. aging aircraft and (2) discussion of technical areas and interagency technical issues. This book is an English translation of the original Japanese, first published in , but with two brand new chapters on fatigue failure of steels and the effect of surface roughness on fatigue strength. The first part of this book includes a concise explanation of metal fatigue.

    Effects of nonmetallic inclusions on fatigue strength. Bearing steels. Spring steels. Tool steels: effect of carbides. Effects of shape and size of artificially introduced alumina particles on Ni-Cr- Mo (En24) steel. Nodular cast iron. Influence of Si-phase on fatigue properties of aluminium alloys. Ti alloys. Torsional fatigue. dominated by initiation so pick small, high-strength microstructures Cracked specimen (Kt > 5) - in the absence of tensile residuals and for near conditions, large grain size preferred Notched Specimen (Kt ≈ 2) - at long lives initiation and crack growth equally important. Avoid high tensile residuals therefore use lower strength materialsFile Size: KB.


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Small-crack effects in high-strength aluminum alloys Download PDF EPUB FB2

Small-Crack Effects in High-Strength Aluminum Alloys A NASA/CAE Cooperative Program J. Newman, Jr. Langley Research Center • Hampton, Virginia X.R.

Wu Institute of Aeronautical Materials • Beijing, People's Republic of China S. Venneri National Aeronautics and Space Administration • Washington, D.C.

C.G. Get this from a library. Small-crack effects in high-strength aluminum alloys: a NASA/CAE cooperative program. [J C Newman; Langley Research Center.;].

Abstract: This chapter describes the industrial production of primary aluminium in Hall-Héroult electrolysis cells, where alumina (Al 2 O 3) is dissolved in a molten fluoride-containing electrolyte consisting mainly of cryolite (Na 3 AlF 6) at about ° chapter then discusses health, environment and safety (HES), and workers’ health and safety are now an integrated part of the.

The program objectives were to identify and characterize crack initiation and growth of small cracks (10 microns to 2 mm long) in commonly used US and PRC aluminum alloys, to improve fracture. In addition to the small crack growth effects, FCG response of aluminum alloys can also be significantly affected by the presence of bulk residual stresses introduced during manufacturing and post-manufacturing processes such as heat treatment.

There is a qualitative understanding of the effects of residual stress on the FCG behavior, but the effects need to be comprehensively quantified and.

Newman has written: 'Prediction of fatigue-crack growth in a high-strength aluminum alloy under variable-amplitude loading' -- subject(s): Aluminum alloys, Fatigue 'An evaluation of the. Small-crack effects in high-strength aluminum alloys [microform]: a NASA/CAE cooperative program / J.C.

Constant amplitude and post-overload fatigue crack growth behavior in PM aluminum alloy AA [microfo Aluminum alloy [microform]: patent application. Small-crack effects in high-strength aluminum alloys [microform]: a NASA/CAE cooperative program [] Hampton, Va.: National Aeronautics and Space Administration, Langley Research Center ; [Springfield, Va.: National Technical Information Service, distributor, ].

Prediction of Fatigue Crack Growth After Single Overload in an Aluminum Alloy. 38 Annual Book of ASTM Standards, Crack Effects in High-Strength Aluminum Alloys, ” NASA/CAE Coopera. Some modifications to the ΔK eff-rate relations were needed in the near-threshold regime to fit small-crack growth rate behavior and endurance limits.

The model was then used to calculate small- and large-crack growth rates, and to predict total fatigue lives, for notched specimens made of several aluminum alloys and a titanium alloy under Cited by: Small-crack effects in high-strength aluminum alloys [microform]: a NASA/CAE cooperative program / J.C.

Constant amplitude and post-overload fatigue crack growth behavior in PM aluminum alloy AA [microfo Aluminum alloy [microform]: patent application; Aluminium alloys for naval use. Newman, J.C.,Jr., “A Crack Closure Model for Predicting Fatigue Crack Growth under Aircraft Spectrum Loading,” Methods and Models for Predicting Fatigue Crack File Size: KB.

machining". Free-machining alloys are not intended for use where welding is required. Phosphorus - is generally considered to be an undesirable impurity in steels. It is normally found in amounts up to % in most carbon steels. In hardened steels, it may tend to cause embrittlement. In low-alloy high-strength steels, phosphorus may be added.

The aluminum alloy is used in many aerospace structural applications. Previous studies have identified that fatigue cracks develop very rough crack-surface profiles, which cause very high crack-closure levels due to a combination of plasticity, roughness and by: 9.

A few “small” crack studies under corrosion fatigue conditions have been performed to characterize the transition of a pit to a “small” crack. In aluminum alloy, Piascik and Willard have shown a three times increase in crack growth rates of “small” cracks in salt water environment when compared to by:   Skorupa, M.: Load interaction effects during fatigue crack growth under variable amplitude loading-a literature review.

Part i: empirical trends: load interaction effects during fatigue crack growth under variable amplitude loading-a literature review. Part I: empirical trends. Fatigue Fract. Eng. Mater. Struct. 21, – ().Author: E.

Amsterdam. () Small-Crack Effects in High-Strength Aluminum Alloys, A NASA/CAE Cooperative Program, NASA Ref. Publ.National Aeronautics and Space Administration, Hampton, Author: Fernand Ellyin. 1 Fatigue life extension by crack repair using double stop-hole technique.

high-strength steels heat treated to over MPa ( ksi) yield strengths have much 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. @article{osti_, title = {Microstructure development in hot-pressed silicon carbide: Effects of aluminum, boron, and carbon additives}, author = {Zhang, Xiao Feng and Yang, Qing and De Jonghe, Lutgard C}, abstractNote = {SiC was hot-pressed with aluminum, boron, and carbon additives.

The Al content was modified either to obtain SiC samples containing a continuous Al gradient, or to vary. However, it is widely accepted that corrosion fatigue crack initiation points are due to surface defects (such as corrosion pits and voids) of aluminium alloys caused by NaCl aqueous solutions by previous literature.

10,27, 28 In addition, effects of second cracks of high‐strength aluminium alloy, ‐T and ‐T, as Cited by: This book concentrates on the manufacturing technology necessary to fabricate and assemble these materials into useful and effective structural components.

Detailed chapters are dedicated to each key metal or alloy used in the industry, including aluminum, magnesium, beryllium, titanium, high strength steels, and superalloys.Conference: Effects of load and thermal histories on mechanical behavior of materials; Proceedings of the Symposium, Denver, CO, Feb.

25, 26, the role of crack closure in crack retardation in P/M and I/M aluminum alloys, the acoustic interrogation of fatigue overload effects, and the effects of frequency and environment on crack.