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Evaluation of Macro- and Micro-Residual Stresses on Textdeed Materials by X-ray, Neutron Diffraction and Defection Measurements

Published online by Cambridge University Press:  06 March 2019

Viktor M. Hauk
Viktor M. Hauk*
Affiliation:
Institut für Werkstoffkunde, Rheinisch Westfälische Technische Hochschule, D-5100 Aachen, F. R, Germany
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Abstract

To evaluate the state of macro- and micro-residual stresses in cold rolled materials of 0.2 to 3 mm thickness the following test methods were used: Measurements of lattice spacing in different directions (φ,Ѱ)with X-rays and neutron-rays on many diffraction peaks. The X-ray method was employed on the surface of the sheet and of the thinned piece after removing several layers from both sides. The neutron-ray method allows measurements in the interior of a specimen and the average of the strain distribution of the total cross section. The etching deflection method determines the macro-residual stresses. The calculation of the macro- anci micro-residual stresses using X-ray elastic constants (XEC) for polycrystalline material and the compliances of single crystals for groups of grains are described. Homogeneous and heterogeneous materials like steels, (α + β)-brass, nickel and copper with 3 % silver were investigated. The state of residual stresses on the surface and with the depth over the cross section was evaluated or is in the final process of investigation.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 29: Thirty-Fourth Annual Conference on Applications of X-ray Analysis, August 5-9, 1985 , 1985 , pp. 1 - 15
Copyright
Copyright © International Centre for Diffraction Data 1985

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