Stability and Relaxation of Micro-Residual Stresses During Tension Fatigue of a Cold-Rolled Steel Strip

Hauk, Viktor; Nikolin, Hans-Joachim

doi:10.1007/978-94-009-1143-7_149

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…For experimental investigations of diffraction elastic constants and validations of different grain-interaction models, the reader is referred to e.g. Brakman et al (1988, Neerfeld-Hill model), Serruys et al (1987, Hauk & Nikolin (1989, Eshelby-Krö ner model), Behnken & Hauk (1991, Eshelby-Krö ner model) and Welzel et al (2003, effective grain-interaction model for thin films).…”

Section: Appendix a Grain-interaction Modelsmentioning

confidence: 99%

Stress analysis of polycrystalline thin films and surface regions by X-ray diffraction

et al. 2005

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The components of the macroscopic mechanical stress tensor of a stressed thin film, coating, multilayer or the region near the surface of a bulk material can in principle be determined by X-ray diffraction. The various analysis methods and measurement strategies, in dependence on specimen and measurement conditions, are summarized and evaluated in this paper. First, different X-ray diffraction geometries (conventional or grazing incidence) are described. Then, the case of macroscopically elastically isotropic, untextured specimens is considered: from the simplest case of a uniaxial state of stress to the most complicated case of a triaxial state of stress. The treatment is organized according to the number of unknowns to be determined (i.e. the state of stress, principal axes known or unknown), the use of one or several values of the rotation angle ' and the tilt angle of the sample, and one or multiple hkl reflections. Next, the focus is on macroscopically elastically anisotropic (e.g. textured) specimens. In this case, the use of diffraction (X-ray) elastic constants is not possible. Instead, diffraction (X-ray) stress factors have to be used. On the basis of examples, it is demonstrated that successful diffraction stress analysis is only possible if an appropriate grain-interaction model is applied.

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Section: Appendix a Grain-interaction Modelsmentioning

confidence: 99%

Stress analysis of polycrystalline thin films and surface regions by X-ray diffraction

et al. 2005

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“…In the literature, one can very often read that the so-called X-ray elastic factors (F) must not be regarded and dealt with as a tensor (see e.g. Dö lle & Hauk, 1979;Brakman, 1987;Barral et al, 1987;Hauk & Nikolin, 1989;Behnken, 1997;Welzel et al, 2005). The justification for this is that the elastic factors do not refer to a coordinate system.…”

Section: Introductionmentioning

confidence: 99%

Symmetry properties and transformation behaviour of the X-ray stress factors

Ortner

2006

J Appl Cryst

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It is shown that the so-called X-ray elasticity factors F ij (', , hkl) are secondrank tensors. The advantages that can be drawn from that fact are revealed: (i) it is possible to find the best strategies for the measurement of F tensors in textured polycrystalline materials; (ii) in some cases, F for one measurement direction can be calculated from F for another measurement direction; (iii) when the measurement direction r(', ) is parallel to a symmetry axis or a mirror plane, some relationships among the entries of the F matrix exist, so the number of independent variables of F is reduced. Different equations are derived which could help in the calculation of the F tensors, be it for single crystals or polycrystalline materials with or without texture. It is also shown that many facts already known about F can be interpreted and proved in an elegant way by making use of the tensor character of F.

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“…[5][6][7][8][9][10]. However, only few investigations have so far been conducted on the behavior and the influence of homogeneous micro stresses during cyclic loading, in particular as a function of predeformation, surface treatments, as well as the kind and height of the load [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Stability and Relaxation of Homogeneous Microstresses in Two-Phase Steels with Cyclic Loading

Renner

Behnken

Hauk

et al. 2005

MSF

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The development of residual stresses during cyclic loading was investigated for a duplex stainless steel with nearly balanced portions of ferrite and austenite. The parameters of the study are the predeformation of the material, the loading mode and the loading amplitude. The X-ray stress evaluation distinguishes between macrostress, homogeneous microstresses of the phases as well as orientation dependent microstresses between the crystallites. Pulsating bending was applied to achieve pure tension on one surface of the specimen and compression on the opposite side. The presented investigations prove a remarkable stability of the homogeneous microstresses independent of the height of the stress amplitude even when exceeding the yield strength. In the steel investigated microstresses change only if macroscopic plastic deformation opposite to the predeformation takes place during cyclic loading. That holds as well for orientation dependent microstresses but the latter appear to be more susceptive to change on plastic deformation.

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Stability and Relaxation of Micro-Residual Stresses During Tension Fatigue of a Cold-Rolled Steel Strip

Cited by 4 publications

References 2 publications

Stress analysis of polycrystalline thin films and surface regions by X-ray diffraction

Stress analysis of polycrystalline thin films and surface regions by X-ray diffraction

Symmetry properties and transformation behaviour of the X-ray stress factors

Stability and Relaxation of Homogeneous Microstresses in Two-Phase Steels with Cyclic Loading

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