Orientation stress field analysis in polycrystalline bcc steel using neutron diffraction

Dakhlaoui, R.; Klosek, Vincent; Mathon, Marie Hélène; Marini, B.

doi:10.1016/j.actamat.2009.09.028

Cited by 13 publications

(10 citation statements)

References 25 publications

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“…[1] were calculated. [29,30] In order to analyse the lattice strains in the bulk sample, we used the ENGIN-X beamline at the ISIS facility, Rutherford Appleton Laboratory (Didcot, UK), using a 50 kN Instron testing rig. Briefly, the ENGIN-X instrument presents a horizontal loading axis composing a 45 deg angle with the incident beam [31] ( Figure 1).…”

Section: Methodsmentioning

confidence: 99%

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Bauschinger Effect in an Austenitic Steel: Neutron Diffraction and a Multiscale Approach

Fajoui

Gloaguen

Legrand

et al. 2016

Metall Mater Trans A

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The generation of internal stresses/strains arising from mechanical deformations in single-phase engineering materials was studied. Neutron diffraction measurements were performed to study the evolution of intergranular strains in austenitic steel during sequential loadings. Intergranular strains expand due to incompatibilities between grains and also resulting from single-crystal elastic and plastic anisotropy. A two-level homogenization approach was adopted in order to predict the mechanical state of deformed polycrystals in relation to the microstructure during Bauschinger tests. A mechanical description of the grain was developed through a micro-meso transition based on the Kro¨ ner model. The meso-macro transition using a self-consistent approach was applied to deduce the global behavior. Mechanical tests and neutron diffraction measurements were used to validate and assess the model.

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Section: Methodsmentioning

confidence: 99%

“…Replacing the expressions of _ e pa (5) and _ c g c [29] into [6], the following linear relation is obtained:…”

Section: A First Transition Schemementioning

confidence: 99%

Bauschinger Effect in an Austenitic Steel: Neutron Diffraction and a Multiscale Approach

Fajoui

Gloaguen

Legrand

et al. 2016

Metall Mater Trans A

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“…A new method of measuring stresses for selected orientations of polycrystalline grains was demonstrated [5]. The new methodology is based on the measurements of lattice strains for several hkl reflections and for different orientations of the sample during in situ tensile testing.…”

Section: Determination Of Local Stress Tensormentioning

confidence: 99%

“…Moreover a new experimental method for study of plastic deformation at macroscopic and mesoscopic scales will be proposed. Last year a new possibility of stress measurements for selected orientations of polycrystalline grains was demonstrated [12]. The new methodology is based on the measurements of lattice strains for several hkl reflections and for different orientations of the sample during in-situ tensile test (tensile machine is rotated in the Eulerian cradle).…”

Section: Planned Researchmentioning

confidence: 99%

“…The new methodology is based on the measurements of lattice strains for several hkl reflections and for different orientations of the sample during in-situ tensile test (tensile machine is rotated in the Eulerian cradle). The experimental data were analyzed using crystallite group method [12]. Neutron measurements performed at 6T1 diffractometer (LLB, Saclay) will allow to determine full stress tensor for several orientations of grains under applied uniaxial load (to find six components of stress tensor, the lattice strains were measured for at least six orientations of scattering vector with respect to the sample).…”

Section: Planned Researchmentioning

confidence: 99%

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Micromechanical Properties and Stress Measurements with Diffraction Methods

Gadalińska

Baczmański

2014

Fatigue of Aircraft Structures

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Diffraction methods are commonly used for the determination of the elastic lattice deformation and distortion from the displacement and broadening of the diffraction peak. These methods enable researchers to measure stresses and elastic properties of polycrystalline materials. The main advantages of diffraction methods are their non-destructive character and the possibility of macrostress and microstress analysis for multiphase and anisotropic materials. Measurements are performed selectively only for crystallites contributing to the measured diffraction peak, i.e. for the grains having lattice orientations for which the Bragg condition is satisfied. When several phases are present in the sample, measurements of separate diffraction peaks allow for the behaviour of each phase to be investigated independently. This method can be applied without any limitations to flat specimens. Numerical calculations of residual stresses around the rivets imply a very high stress gradientin the case of tangential stresses as well in the case of radial stresses. Attempting to verify these predictions, the residual stress measurements with an X-ray diffractometer were performed on riveted samples after the riveting process. In addition, complementary measurements of strain values with strain gauges during the riveting process were performed as well as the finite elements modelling. The aim of these measurements was to determine the stress values around the rivets and to compare results obtained with different techniques. On the other hand, the multi-scale crystallographic model of elastoplastic deformation is very convenient for the study of elastoplastic properties in microscopic and macroscopic scales. Comparison of experimental data with model predictions allows us to understand the physical phenomena that occur during a sample’s deformation at the level of polycrystalline grains. Moreover, the micro and macro parameters of elastoplastic deformation can be experimentally established. It should be stated that the characterisation of the residual stress field and elastic properties is important in the study of the mechanical behaviour of polycrystalline materials, including plasticity and damage phenomena. In this work, a new analysis method of neutron diffraction results obtained during in-situ tensile load is proposed and tested. The methodology is based on the measurements of lattice strains during in-situ tensile testing for several hkl reflections and for different orientations of the sample with respect to the scattering vector. As the result, the full stress tensor for preferred texture orientations in function of the applied stress can be determined using the crystallite group method. The experimental data are presented and compared with the self-consistent model calculations performed for groups of grains selected by different hkl reflections.

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Measuring texture-component-dependent stress of CuZn39Pb2 by neutron diffraction

Zhai,

Liu,

Shang

et al. 2024

International Journal of Mechanical Sciences

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Orientation stress field analysis in polycrystalline bcc steel using neutron diffraction

Cited by 13 publications

References 25 publications

Bauschinger Effect in an Austenitic Steel: Neutron Diffraction and a Multiscale Approach

Bauschinger Effect in an Austenitic Steel: Neutron Diffraction and a Multiscale Approach

Micromechanical Properties and Stress Measurements with Diffraction Methods

Measuring texture-component-dependent stress of CuZn39Pb2 by neutron diffraction

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