On the strain-free lattice constants in residual stress evaluation by diffraction

Wieder, Thomas

doi:10.1016/s0191-8141(00)00111-5

Cited by 6 publications

(4 citation statements)

References 14 publications

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“…However, the penetration depth of XRD in our studied case is in the same order as Zn film. It is supposed that the stress in the normal direction to the sample surface is supposed to be zero (σ [7]. In this case, our results (σ 11 −σ) and (σ 22 −σ 33 ) can explain in the sample reference which corresponds to a plan stress in the Zinc film (plan stress state).…”

Section: Fig 1: Xrd Measurement Directionsmentioning

confidence: 64%

Stresses Analysis on Coarse Grain Zn Film during Tensile Loading

Huang

Seiler

2006

MSF

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The advance of the XRD technique allows us to reach the properties of each coarse grain. This paper has demonstrated a new method to determine stress in a single crystal for multicrystal material and this new method could be specially applied for any symmetric crystalline systems. The strain tensor ε is determined by the change of the metric tensor G before the initial state and after the deformed state in the crystal reference system. Then stress tensor at grain scale is calculated by the Hooks law. The stress evaluations are carried out in coarse grains of a thin galvanized coating on a steel substrate during tensile loading. This study allows us to link the microstructure evolution to the elastic heterogeneity at grain scale or between the grains.

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Section: Fig 1: Xrd Measurement Directionsmentioning

confidence: 64%

Stresses Analysis on Coarse Grain Zn Film during Tensile Loading

Huang

Seiler

2006

MSF

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“…If the diffraction angle for the unstressed sample is unknown, it is difficult to determine the X‐ray elastic constants. However, substituting the diffraction angle of the lattice plane parallel to the sample surface 2θ ϕ0 for the unknown 2θ 0 allows the constants to be determined with only negligible error in the calculated stress magnitude [ Noyan and Cohen , 1987; Wieder , 2000].…”

Section: Methodsmentioning

confidence: 99%

“…[14] Although a three-dimensional residual strain state was successfully obtained in Friedman's studies, the method is affected by the d 0 problem, that is, the evaluation of equation ( 1) requires accurate values for the unstressed lattice spacing [e.g., Wieder, 2000].…”

Section: Stress Measurement By X-ray Diffractometrymentioning

confidence: 99%

Residual stress measurements on a quartz vein: A constraint on paleostress magnitude

Sekine

Hayashi

2009

J. Geophys. Res.

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[1] The residual stress in a quartz vein from a metamorphic province is evaluated by an X-ray diffraction technique. Diffraction analyses at multiple incident angles yield residual stress magnitudes for the specified directions on the plane parallel to the sample surface. Residual stress formation in the vein is found to be determined by the platy geometry with respect to the host rock. The results indicate a compressive residual stress of À15 to À20 MPa parallel to the long axis of the vein. The compressive stress magnitude parallel to the quartz vein is found to increase with sample temperature, indicating that the quartz vein has a greater thermal expansion coefficient than that of the host rock. A two-dimensional model explaining residual stress formation in the vein in response to tectonic exhumation is proposed, and the paleostress magnitude at the time of vein formation is estimated from the residual stress magnitude and fluid inclusion microthermometric data. The quartz vein is concluded to have formed under a horizontal compressive stress of 550-660 MPa in the direction parallel to the long axis of the vein.

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“…These deal with aspects such as point to point variation of composition in wclds, 29 31 the presence of both microstresses and macrostrcsscs, 32 and the usc of analytical mcthods. 33 Also, a clever means of extracting stress free cell parameters has been proposed using cubic materials that have been elastically loaded and arc elastically anisotropic. 34 Two papers deal specifically with the issuc, 35 • 36 with the one by Withers eta/.…”

Section: Stress Free Referencesmentioning

confidence: 99%

Neutron Strain measurement

Krawitz

2011

Materials Science and Technology

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The use of neutrons has extended the technique of diffraction strain measurement from an essentially two-dimensional, near-surface tool using X-rays to a true three-dimensional method. The depth scale has gone from micrometres to millimetres. This initially gave rise to subsurface measurements of type I residual macrostresses in weldments and type II residual microstresses in anisotropic and multiphase metals, and composites. Soon the possibilities of in situ applied stress measurements became apparent and today they represent a significant portion of the work being carried out. This perspective focuses on the current state of the art, the prospects and developments necessary for further progress. The transition from two- to three-dimensions raised the issues of stress free reference values, methodology for general tensor measurements, beam optics and experimental design. Workers invested great effort in resolving these issues. In addition, the development of pulsed source instruments has enabled in situ measurements of slip, fatigue, load partitioning, twinning, high T stress-strain response, thermal cycling and the shape memory effect. Most recently, the SNS instrument, VULCAN, has introduced torsion and continuous recording of data which can later be binned in the shortest statistically significant time intervals.

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On the strain-free lattice constants in residual stress evaluation by diffraction

Cited by 6 publications

References 14 publications

Stresses Analysis on Coarse Grain Zn Film during Tensile Loading

Stresses Analysis on Coarse Grain Zn Film during Tensile Loading

Residual stress measurements on a quartz vein: A constraint on paleostress magnitude

Neutron Strain measurement

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