Measurement of deformation fields in polycrystalline OFHC copper

Schroeter, B.; McDowell, David L.

doi:10.1016/s0749-6419(02)00040-2

Cited by 69 publications

(37 citation statements)

References 38 publications

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“…According to (10) and (11), the elastic modulus along <110> and <111> orientations is E 110 � 193.81 GPa and E 111 � 299.77 GPa, respectively. e highest elastic stiffness is along the <111> orientation, and the lowest stiffness is along the <100> orientation, as shown in In order to deeply understand the GB characterization, three types of incompatibility bicrystal models were built by combining grains with different orientations mentioned above, as listed in Table 2.…”

Section: Materials Proprietymentioning

confidence: 99%

“…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%

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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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Section: Materials Proprietymentioning

confidence: 99%

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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“…Several lithographic processes exist and allow to obtain micrometric gratings [Dally and Read, 1993, Xie et al, 2003, Allais et al, 1994, Schroeter and McDowell, 2003]. Direct interferometric photolithography was selected here.…”

Section: Full-field Measurementmentioning

confidence: 99%

Full-field evaluation of the onset of microplasticity in a steel specimen

Moulart

Rotinat

Pierron

2009

Mechanics of Materials

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. AbstractThis work deals with the study of the local onset of microplasticity in a steel specimen under tensile test through the use of a full-field strain measurement method at the micrometric scale. The kinematic measurements were performed by the so called grid method. In order to produce the gratings, direct interferential photolithography was used. The gratings were digitized through the use of a white-light interferometric microscope. An adapted image stitching algorithm, applied to the phase maps, has been developed and implemented in order to extend the size of the region of interest. With this method, and by paying a particular attention to the conduct of the mechanical tests, the strain resolution obtained ranges from 1 to 2×10 −3 for a spatial resolution of about 20 µm. In this paper, the method was applied to the study of the onset of local elasto-plastic strains in a ferritic steel coupon. The results show that the method is well suited to study small localized strains, for which few alternatives exist. To the best knowledge of the authors, it is the first time that white light interferometric microscopy is used to measure full-field strains. The technique is reasonably easy to set up although a number of limitations exist. The paper is concluded by some considerations about further work required to extend the range of applicability of the method.

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“…3 Frequencies of step angle in 4-and 35-dpa-irradiated and 2% deformed stainless steel samples 6) elastic property of each crystal. [9][10][11][12][13][14] Figure 6 shows the stress distribution along a line parallel to the z-axis. Here, the stresses were obtained by interpolating adjacent integral points of solid elements.…”

Section: Finite Element Analysismentioning

confidence: 99%

“…The anisotropic properties of each crystal produce nonuniform stress at the microstructural level. [9][10][11][12][13][14] This may affect the angular distribution of step angle.…”

Section: Introductionmentioning

confidence: 99%

Angular Distribution of Slip Steps by Three-Dimensional Polycrystalline Model for Stainless Steel

Kamaya¹,

Fukuya²,

Kitamura

2009

Journal of Nuclear Science and Technology

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Localized deformation plays an important role in the initiation of irradiation-assisted stress corrosion cracking, and it can be characterized by the spacing and inclination of slip steps observed on the surface. In order to examine the contribution of mechanical factors (stress) to slipping, the angular distribution of slip steps was evaluated by using a three-dimensional polycrystalline model generated by Voronoi tessellation. An elastic finite element analysis was performed to derive the resolved shear stress (RSS) acting on each slip system. Random crystallographic orientations assigned to each grain caused the microstructural inhomogeneity of local stress due to anisotropic elastic properties. The angular distribution obtained was compared with the experimental results observed in irradiated and deformed stainless steel. It was shown that mechanical factors dominate the slipping behavior of the irradiated stainless steel and that not only RSS but also normal stress acting on the slip plane affects the crystallographic slip. The angular distribution was also evaluated from the maximum Schmid factor of individual grains, in which the inhomogeneous local stress was not taken into account. The angular distributions obtained using RSS and the Schmid factor were almost the same. This suggests that the inhomogeneity of local stress negligibly affects the angular distribution of slip steps, although the change in the local stress in the polycrystalline material is significant.

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Measurement of deformation fields in polycrystalline OFHC copper

Cited by 69 publications

References 38 publications

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

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

Full-field evaluation of the onset of microplasticity in a steel specimen

Angular Distribution of Slip Steps by Three-Dimensional Polycrystalline Model for Stainless Steel

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