Effect of vacuum on the fatigue life of aluminum

Shen, H.; Podlaseck, S.; Kramer, I. R.

doi:10.1016/0001-6160(66)90093-9

Cited by 68 publications

(12 citation statements)

References 11 publications

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“…The N f in vacuum was significantly improved and was two orders of magnitude larger than that in air. The improvement in the N f in vacuum compared to that in air can be seen in other literature [10,14,21,22].…”

Section: Relation Between Crack Length and Number Of Cyclessupporting

confidence: 70%

Effects of vacuum environment on small fatigue crack propagation in Ti–6Al–4V

Yoshinaka

Nakamura

Takaku

2016

International Journal of Fatigue

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a b s t r a c tSmall fatigue crack propagation tests were conducted on Ti-6Al-4V in ultrahigh vacuum, air, and argon to clarify the effects of vacuum on crack propagation processes. The crack propagation rate in vacuum was significantly lower than that in air. The crack propagation rate in argon agreed with that in air in the small crack regime; however, it became similar to that in vacuum in the long crack regime. This indicates that the existence of gases has significant effects in the small crack regime, even if they are chemically inert. These results led us to conclude that, in addition to chemical inactivity, the absence of physical adsorption plays an important role in the retarding effect of vacuum on small crack propagation.

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Section: Relation Between Crack Length and Number Of Cyclessupporting

confidence: 70%

Effects of vacuum environment on small fatigue crack propagation in Ti–6Al–4V

Yoshinaka

Nakamura

Takaku

2016

International Journal of Fatigue

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“…The transition pressure for the two investigations shifted by 1000-fold for a 15-fold change in cyclic rate. A similar critical pressure range (10~5 to 10~3 torr) for aluminum specimens in cyclic, fully reversed plane bending, was found by Shen et al 11 at frequencies of 49 and 76 cps and by Hordon 12 at 25 and 50 cps.…”

Section: Residual Gas Analysessupporting

confidence: 79%

Vacuum effects on fatigue properties of magnesium and two magnesium alloys.

Sumsion

1968

Journal of Spacecraft and Rockets

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The effects of a high-vacuum environment and of vacuum outgassing time on the fatigue properties of unalloyed magnesium and of magnesium-thorium and magnesium-lithium alloys under constant-load, reversed bending (30 cps) were studied. Tests were run, all at room temperature, at atmospheric pressure and at various pressure levels down to 10 ~8 torr. The S-N curves for all three metals show significant increases in their fatigue properties in vacuum; typically, at 10 7 cycles, the increases in fatigue limits were approximately 45% in vacuum over those in air. Also, at an outer fiber stress equal to the yield stress of the material, for example, fatigue lives increased by factors of 3, 5, and 12 for magnesium-lithium, magnesium, and magnesium-thorium, respectively. Prolonged outgassing prior to fatigue testing had no significant effect on the vacuum fatigue properties of any of the metals studied in this investigation. For the conditions of these tests, the critical pressure range below which fatigue properties are increased was established at 0.1 to 1 torr for commercially pure magnesium. Two possible explanations of the increase of fatigue properties of metals in vacuum environment over those in air are discussed, and the experimental evidence supporting each is evaluated.

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“…In high-current-density contacts, thick, electrochemically enhanced films more effectively trap dislocations and thereby accelerate delamination wear. Several groups have reported an analogous reduction in fatigue strength of thin metal films in fully reversed cyclic bending with and without passivating films (88)(89)(90). This reduction was demonstrated, perhaps most clearly via transmission electron microscopy by Nicola et al (91), to be a function of enhanced strain energy accumulation due to near-surface dislocation trapping.…”

Section: Boyer and Colleaguesmentioning

confidence: 96%

“…Researchers then postulated a more complete description of the mechanism for the asymmetrical wear behavior (54,85). This description was founded on a concept originating in a relatively obscure 1926 publication by Roscoe (86), later described and elaborated upon by Buckley and others (87)(88)(89) in the 1950s and 1970s and referred to as the Roscoe effect.…”

Section: Boyer and Colleaguesmentioning

confidence: 99%

Mechanistic Studies in Friction and Wear of Bulk Materials

Sawyer

Argibay

Burris

et al. 2014

Annu. Rev. Mater. Res.

121

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From the context of a contemporary understanding of the phenomenological origins of friction and wear of materials, we review insightful contributions from recent experimental investigations of three classes of materials that exhibit uniquely contrasting tribological behaviors: metals, polymers, and ionic solids. We focus on the past decade of research by the community to better understand the correlations between environment parameters, materials properties, and tribological behavior in systems of increasingly greater complexity utilizing novel synthesis and in situ experimental techniques. In addition to such review, and a half-century after seminal publications on the subject, we present recently acquired evidence linking anisotropy in friction response with anisotropy in wear behavior of crystalline ionic solids as a function of crystallographic orientation. Although the tribological behaviors of metals, polymers, and ionic solids differ widely, it is increasingly more evident that the mechanistic origins (such as fatigue, corrosion, abrasion, and adhesion) are essentially the same. However, we hope to present a clear and compelling argument favoring the prominent and irreplaceable role of in situ experimental techniques as a bridge between fundamental atomistic and molecular processes and emergent behaviors governing tribological contacts. 395 Annu. Rev. Mater. Res. 2014.44:395-427. Downloaded from www.annualreviews.org Access provided by University of Utah -Marriot Library on 11/27/14. For personal use only.

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Effect of vacuum on the fatigue life of aluminum

Cited by 68 publications

References 11 publications

Effects of vacuum environment on small fatigue crack propagation in Ti–6Al–4V

Effects of vacuum environment on small fatigue crack propagation in Ti–6Al–4V

Vacuum effects on fatigue properties of magnesium and two magnesium alloys.

Mechanistic Studies in Friction and Wear of Bulk Materials

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