The role of elastic interaction stresses on the onset of slip in polycrystalline alpha brass—II. Rationalization of slip behavior

Hashimoto, Keizo; Margolin, Harold

doi:10.1016/0001-6160(83)90094-9

Cited by 37 publications

(16 citation statements)

References 6 publications

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“…[12] The flow stress GB is related to the local dislocation density in the vicinity of the grain boundary ( VGB ): For the sake of simplicity, we assume that slip multiplicity occurs rapidly in the layer, in accordance with previous experimental reports; [71,72] consequently, ␣ GB is taken to be equal to ␣ II (equal to 0.4). Substituting Eq.…”

Section: B Inter-and Intragranular Backstressesmentioning

confidence: 99%

Grain-size effects on tensile behavior of nickel and AISI 316L stainless steel

Feaugas

Haddou

2003

Metall Mater Trans A

129

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The aim of this work is to provide experimental results to understand the grain-size effects on tensile hardening of fcc polycrystalline materials. The contribution of grain size on hardening rate is discussed in terms of backstress (X) and effective-stress (⌺ ef ) evolutions in the different hardening stages. Based on this stress partition, the origin of the classical Hall-Petch relationship is clarified at the different levels of microstructural heterogeneities. If the backstresses and effective stresses verified the Hall-Petch formulation, however, the effective stress is less dependent on grain size than the backstress. The grain-size effect on short-range internal stresses (effective stress) is well explained in terms of a mean path length using classical dislocation modeling. The backstress dependence on grain size seems to be mainly the result of intergranular plastic-strain incompatibilities in relation with the formation of a grain-boundary layer in stage I. In others stages (higher plastic strain), the interactions between intergranular and intragranular long-range internal stresses have been illustrated. The degree of these interactions remains unclear.

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Section: B Inter-and Intragranular Backstressesmentioning

confidence: 99%

Grain-size effects on tensile behavior of nickel and AISI 316L stainless steel

Feaugas

Haddou

2003

Metall Mater Trans A

129

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“…It is well known that both assumptions are seldom realistic (Kr6ner, 1967;Hashimoto & Margolin, 1983).…”

Section: Letters To the Editormentioning

confidence: 99%

“…In addition to this our experiments on cold-rolled (one-phase) steel sheet specimens indicate that the Reuss model in combination with texture and the macrostresses <~, a22, a~ 2 performs quite well in the sense that the oscillations of the graph of (e'.=> vs sin2~ are predicted very well. The grain interaction stresses mentioned by Hashimoto & Margolin (1983) can only contribute to microstress fields and X-ray diffraction line broadening. The elastic polarization tensors mentioned by Kr6ner (1967) can only give rise to pseudo-macrostresses.…”

Section: ) the Reuss Model Of Elasticitymentioning

confidence: 99%

Comment on `Residual stresses in cubic materials with orthorhombic or monoclinic specimen symmetry: influence of texture on ψ splitting and non-linear behaviour' by C.M. Brakman

Cohen¹,

Noyan²

1984

J Appl Cryst

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The ROCKS crystallographic computing system is a general complete integrated and easy-to-use system of programs for macromolecular structure determination. However, it has heretofore been available only on IBM 360 or 370 mainframe computers. This note reports the successful adaptation of the ROCKS system to the DEC VAX series of superminicomputers.The ROCKS system of crystallographic computer programs is described in detail by Reeke (1984). It provides a complete and unified set of programs for film scanning, initial data reduction, sorting and merging, scaling and data correlation, structure factor and least squares, and Fourier and Patterson calculations. A number of different laboratories have used it successfully.The original version of ROCKS was written for the IBM 360 computer. Efficiency and ease of use were more important goals than portability, and it has not previously been possible to run the ROCKS programs on computers other than the IBM 360/370 series. The chief obstacle to portability was the use of large amounts of Assembler language code in certain places to avoid the inefficiency and limitations of Fortran. This code has now been converted to equivalent VAX Fortran and Assembler language, making it possible to run the ROCKS programs on the widely available VAX computers.The VAX version of ROCKS is now a complete system, with one major exception to be mentioned below. It is used routinely in our laboratory for oscillation film processing and other tasks, and has been distributed to several other laboratories. The VAX version is highly compatible with the original version. The reference manual for the 360 version of ROCKS also serves for the VAX version, along with a short document listing operating system procedures and the few minor implementation differences.Three subprograms of 360/370 ROCKS are written largely or entirely in Assembler language, and have not been converted at this time. These are the Fourier, contour, and structure-factor/ieast-squares (including isomorphous replacement) subprograms.Alternatives to the Fourier and contour subprogram exist in the present system. A fast Fourier subprogram using Fourier transform subroutines by Ten Eyck (1973) has been added. It handles all space groups automatically by expanding the input asymmetric unit of data to a hemisphere. The program does not require that sampling intervals be powers of two; however, it does not do skew planes or orthogonal sampling as the original ROCKS Fourier program does. A contouring program which produces output on a plotter, rather than a line printer as in the original version, has also been added. This program was written to be portable, and will eventually be incorporated into the 360 version of ROCKS.Unfortunately, there is no structure-factor/least-squares program in the current system; this is the most serious limitation of the present VAX implementation. A more portable SFLS program is expected to be incorporated into 360/370 ROCKS in the near future. When this program becomes available, it will be a...

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“…Many attempts have been made to acquire the stress state of the crack tip due to its importance [6,7]; however, the stress and strain are obtained macroscopically based on the assumption that the materials are isotropic and homogeneous in terms of elastic deformation when the materials have random crystallographic and morphologic texture. In fact, the crack tip stress state is significantly affected by the microstructure of materials due to the misorientation and anisotropic of each component crystal, and the crack tip would have a nonuniform stress at the microstructural level even under a uniform remote stress condition [8][9][10][11]. e inhomogeneity stress distribution caused by anisotropic of grains would play an important role in the initiation and propagation of SCC [12].…”

Section: Introductionmentioning

confidence: 99%

Effects of Grain Orientation on Stress State near Grain Boundary of Austenitic Stainless Steel Bicrystals

Yang

Xue

Zhao

et al. 2018

Advances in Materials Science and Engineering

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e stress state at the crack tip of structural components in nuclear power plants used in the SCC quantitative prediction models is based on the assumption that the polycrystalline material is isotropic and homogeneous at present. However, the crystals in polycrystalline materials are anisotropic with different orientations, which would induce a nonuniform stress to cause the initiation and propagation of SCC. By using a finite element method, the elastic responses of anisotropic behaviors of austenitic stainless steel bicrystals are studied. e results indicate that the stress distribution near GBs depends strongly on the crystal orientation. A larger Mises stress concentration exists on the GB with larger stiffness along the load direction. e Mises stress difference is higher in the bicrystal with bigger elastic modulus difference of two neighboring grains along the tensile axis. In the bicrystal with GB perpendicular to the tensile axis, the grain orientation has little effects on the Mises stress far from the GB in both grains. e strain inconsistency in bicrystals is affected by the mismatch of two neighboring grains. e larger the elastic modulus differences between two neighboring grains caused by misorientation, the larger the strain inconsistency in the bicrystal.

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The role of elastic interaction stresses on the onset of slip in polycrystalline alpha brass—II. Rationalization of slip behavior

Cited by 37 publications

References 6 publications

Grain-size effects on tensile behavior of nickel and AISI 316L stainless steel

Grain-size effects on tensile behavior of nickel and AISI 316L stainless steel

Comment on `Residual stresses in cubic materials with orthorhombic or monoclinic specimen symmetry: influence of texture on ψ splitting and non-linear behaviour' by C.M. Brakman

Effects of Grain Orientation on Stress State near Grain Boundary of Austenitic Stainless Steel Bicrystals

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