Nitrous oxide reduces inspired oxygen fraction but does not compromise circulation and oxygenation during hemodilution in pigs

Schou, Henning; Sá, Valéria Perez de; Roscher, Roger; Larsson, Anders

doi:10.1111/j.1399-6576.1997.tb04810.x

Cited by 7 publications

(7 citation statements)

References 24 publications

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“…Thus dislocation boundaries and typical lamellar structure with elongated cells due to the inhomogeneously distributed dislocations appear out. These have also been observed within the shear bands of some other materials such as steels [15][16][17][18][19] and aluminium [20].…”

Section: The Microstructure Within the Shear Bandsmentioning

confidence: 72%

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Dynamic recrystallization induced by plastic deformation at high strain rate in a Monel alloy

Lai

et al. 2000

Materials Science and Engineering: A

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An investigation has been made into the plastic deformation behavior of a Monel alloy deformed at high strain rate of 10 5 sby split Hopkinson bar. The results reveal that there are some equiaxed grains with an average size of 150 nm in diameter in the center of the shear bands, suggesting that this microstructure characteristics be developed by dynamic recrystallization, arising from the deformation and the rapid temperature rise in the band. Analysis shows that the plastic strain rate and the mobile dislocation density play a key role in the new crystallized grain formation and growth. Based on grain boundary energy change and diffusion mechanism, the grain growth kinetics is developed for plastic deformation at a high strain rate.

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Section: The Microstructure Within the Shear Bandsmentioning

confidence: 72%

“…The microstructure evolution during the plastic deformation is the essential issue of this research topic [15][16][17][18][19]. It is rather difficult to observe directly how the microstructure is evolved in the deformation process.…”

Section: The Microstructure Within the Shear Bandsmentioning

confidence: 99%

Dynamic recrystallization induced by plastic deformation at high strain rate in a Monel alloy

Lai

et al. 2000

Materials Science and Engineering: A

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“…Cho et al [191] considered that the fine equiaxed grains observed in the center region of a shear band in HY-100 steel was caused by dynamic recovery rather than by DRX. It is possible that, in their case, the strain inside the shear band was not sufficient to complete the recrystallization process.…”

Section: G Recrystallizationmentioning

confidence: 99%

Shear Localization in Dynamic Deformation: Microstructural Evolution

Jing-hua

Bai

et al. 2008

Metall Mater Trans A

244

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Investigations made by the authors and collaborators into the microstructural aspects of adiabatic shear localization are critically reviewed. The materials analyzed are low-carbon steels, 304 stainless steel, monocrystalline Fe-Ni-Cr, Ti and its alloys, Al-Li alloys, Zircaloy, copper, and Al/SiC p composites. The principal findings are the following: (a) there is a strain-ratedependent critical strain for the development of shear bands; (b) deformed bands and whiteetching bands correspond to different stages of deformation; (c) different slip activities occur in different stages of band development; (d) grain refinement and amorphization occur in shear bands; (e) loss of stress-carrying capability is more closely associated with microdefects rather than with localization of strain; (f) both crystalline rotation and slip play important roles; and (g) band development and band structures are material dependent. Additionally, avenues for new research directions are suggested.

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“…[22,26] The dominant mechanism driving microstructural changes within ASBs during the shear deformation of metals and alloys is unclear and a number of different mechanisms have been proposed. These include dynamic recovery, [27,28] dynamic recrystallization, [12,21,[29][30][31][32] strain-induced phase transformation, [33,34] amorphization, [20,35] and carbon segregation. [15] The strain-induced phase transformation mechanism has been challenged by researchers who claim that evidence for a phase transformation in ASBs has not been provided [28] and that, even if one did occur, it would be of secondary importance to another mechanism.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior and Microstructural Development of Low-Carbon Steel and Microcomposite Steel Reinforcement Bars Deformed under Quasi-Static and Dynamic Shear Loading

Dougherty

Cerreta

Gray

et al. 2009

Metall Mater Trans A

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Reinforcement bars of microcomposite (MC) steel, composed of lath martensite and minor amounts of retained austenite, possess improved strength and corrosion characteristics over low-carbon (LC) steel rebar; however, their performance under shear loading has not previously been investigated at the microstructural level. In this study, LC and MC steel cylinders were compression tested, and specimens machined into a forced-shear geometry were subjected to quasi-static and dynamic shear loading to determine their shear behavior as a function of the strain and strain rate. The as-received and sheared microstructures were examined using optical microscopy (OM), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD). Higher-resolution microstructural examinations were performed using transmission electron microscopy (TEM). The influence of the starting microstructure on the shear behavior was found to depend strongly on the strain rate; the MC steel exhibited not only greater strainrate sensitivity than the LC steel but also a greater resistance to shear localization with load. In both steels, despite differences in the starting microstructure, post-mortem observations were consistent with a continuous mechanism operating within adiabatic shear bands (ASBs), in which subgrains rotated into highly misoriented grains containing a high density of dislocations.

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Nitrous oxide reduces inspired oxygen fraction but does not compromise circulation and oxygenation during hemodilution in pigs

Cited by 7 publications

References 24 publications

Dynamic recrystallization induced by plastic deformation at high strain rate in a Monel alloy

Dynamic recrystallization induced by plastic deformation at high strain rate in a Monel alloy

Shear Localization in Dynamic Deformation: Microstructural Evolution

Mechanical Behavior and Microstructural Development of Low-Carbon Steel and Microcomposite Steel Reinforcement Bars Deformed under Quasi-Static and Dynamic Shear Loading

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