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Stress Evaluation on Materials Having Non-Linear Lattice Strain Distributions

  • Viktor M. Hauk (a1)

Abstract

The state of the art of stress evaluation on materials having non-linear lattice strain distributions is presented.

New results on heterogeneous materials with measurements conducted on both phases of the material show compensation of the shear stress components σ13 in ground surface layers of (α+β) brass. There is only the compensation of normal components σ11 of (α+γ) steel after plastic straining.

The fundamental aspects and the evaluation of macro- and microresidual stresses on materials having preferred orientation are broadened. The use of Mo-Ka-radiation shows linear lattice strain distributions, as a result of minimizing the influence of micro residual stresses causing oscillations. The interplanar distance- or strain-polefigure shows similarities with the intensity polefigure.

The knowledge of the theoretical influence of stress distribution with depth from the surface of the material is extended. The experimental procedure should use either different radiations having different penetration depths or a low-penetrating radiation in combination with removal of surface layers.

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References

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2. Hauk, V. and Vaessen, G., Evaluation of non-linear lattice strain distribution (in German), in:“Eigenspannungen und Lastspannungen, Moderne Ermittlung-Ergebnisse-Bewertung”, Edited by Hauk, V. and Macherauch, E., HTM-Beiheft Carl Hanser Verlag Munchen Wien:38 (1982).
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4. Dolle, H. and Hauk, V., Evaluation of residual stress systems arbitrarily oriented by X-rays (in German), HIM 31:165(1976).
5. Hauk, V., Krug, W. K., G. Vaessen and Weisshaupt, H., The residual strain-/stress-condition after grinding (in German), HTM 35:144 (1980).
6. Hauk, V. and Kockelmann, H., X-ray elastic constants of ferritic, austenitic and hardened steels (in German), Arch. Eisenhuttenwes. 50:347 (1979).
7. Hauk, V., X-ray elastic constants (XEC) (in German), same as 2:49 (1982).
8. Hauk, V., Stuitje, P. J. T. and Vaessen, G., Presentation and compensation of residual stresses in machined surface layers of heterogeneous materials (in German), same as 2:129 (1982).
9. Broszeit, E., Hauk, V. Kloos, K. H. and Stuitje, P. J. T., to be Published.
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12. Hauk, V. and Stuitje, P. J. T., Residual stresses in the phases of heterogeneous materials after machining (in German), Symposium Karlsruhe (1983), in press.
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15. Krause, H. and Mathias, M., Strain measurement on the cementite and ferrite-phase after different machining of surfaces (in German), to be published.
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25. Hauk, V. and Kockelmann, H., Calculation of the distribution of the intensity and the lattice strain out of inverse polefigures, Z. Metallkde. 69:16 (1978). Hauk, V. and Kockelmann, H., Lattice strain distribution of plastically deformed specimens of pure and silver alloyed copper (in German), Z. Metallkde. 71:303 (1980).
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33. Hauk, V. and Vaessen, G., to be published.
34. Hauk, V. and Vaessen, G., X-ray stress evaluation on steels having preferred orientation (in German), Symposium Karlsruhe (1983), in press.
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42. Hauk, V., Oudelhoven, R. and Vaessen, G., The state of residual stress in the near surface region of homogeneous and heterogeneous materials after grinding, Metallurgical Transactions 13 A:1239 (1982).
43. In meantime the paper, Equilibrium conditions for the average stresses measured by X-rays by I. C. Noyan was published in Metallurgical Transactions 14 A September:1907 (1983).

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