Ingenieur-Archiv

, Volume 44, Issue 3, pp 153–160 | Cite as

Mean-stress approach to integration of differential equations in elastostatics, and the Neuber-Papkovich and Galerkin representations

  • J. J. Golecki
Article

Summary

The mean-stress approach proposed by the author for integration of differential equation in elastostatics is applied to derivation of uncoupled solutions. In particular, the Neuber-Papkovich and Galerkin representations are analysed and adapted for use in elastostatics of incompressible bodies and in theory of slow steady viscous flow. It is shown that in multiply-connected regions, both representations may lead to many-valued solutions unless the special integral conditions are satisfied identically.

Keywords

Differential Equation Neural Network Complex System Information Theory Nonlinear Dynamics 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Übersicht

Das vom Verfasser vorgeschlagene Verfahren einer Spannungsmittelung zur Integration von Differentialgleichungen der Elastostatik wird zur Ableitung von ungekoppelten Lösungen verwendet. Insbesondere werden die von Neuber-Papkovich und Galerkin gegebenen Darstellungen für den Gebrauch in der Elastostatik inkompressibler Körper sowie in der Theorie von langsamen, stationären, viskosen Strömungen angepaßt. Es wird gezeigt, daß beide Darstellungsarten bei mehrfach zusammenhängenden Bereichen zu mehrdeutigen Lösungen führen, falls nicht die besonderen Integralbedingungen erfüllt sind.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Golecki, J. J.: Integration of differential equations in elastostatics by determination of the mean stress (I). Report TDM 72-06. Department of Mechanics, Technion—Israel Institute of Technology, Haifa, Israel, 1972Google Scholar
  2. 2.
    Golecki, J. J.: Integration of differential equations in elastostatics by determination of the mean stress (II). Report TDM 73-27. Department of Mechanics. Technion—Israel Institute of Technology, Haifa, Israel, 1973Google Scholar
  3. 3.
    Golecki, J. J.: Integration of differential equations in elastostatics through determination of the mean stress. Ing.-Arch. 43 (1974) pp. 331–344Google Scholar
  4. 4.
    Goodier, J. N.: Slow viscous flow and elastic deformation. Phil. Mag. 7 (1936) pp. 678–681Google Scholar
  5. 5.
    Nadai, A.: Theory of flow and fracture of solids. Vol. 1, 2nd ed., New York 1950Google Scholar
  6. 6.
    Golecki, J. J.: Mean-stress approach in two-dimensional elasticity (normal regions). Report TDM 73-06, Department of Mechanics, Technion—Israel Institute of Technology, Haifa, Israle, 1973Google Scholar
  7. 7.
    Golecki, J. J.: Mean-stress approach in two-dimensional elasticity (star-shaped regions). Report TDM 73-09, Department of Mechanics, Technion—Israel Institute of Technology, Haifa, Israel, 1973Google Scholar
  8. 8.
    Neuber, H.: Vollständigkeitsbeweis des Dreifunktionenansatzes der linearen Elastizitätstheorie. Ing.-Arch. 41 (1972) pp. 232–234Google Scholar
  9. 9.
    Golecki, J. J.: On many-valuedness of the Neuber-Papkovich solution in two-dimensional elasticity. Report TDM 74-06, Department of Mechanics, Technion—Israel Institute of Technology, Haifa, Israel, 1974Google Scholar
  10. 10.
    Golecki, J. J.: On many-valuedness of the Neuber-Papkovich solution in two-dimensional elasticity. Mechanics Research Communications 1 (1974) pp. 85–88Google Scholar
  11. 11.
    Mann, E. H.: An elastic theory of dislocations. Proc. Royal Soc. A199 (1949) pp. 376–394Google Scholar
  12. 12.
    Bogdanoff, J. L.: On the theory of dislocations. J. Appl. Phys. 21 (1950) pp. 1258–1263Google Scholar
  13. 13.
    Neuber, H.: Unendliche Scheiben und Halbscheiben mit Kraft- und Versetzungssingularitäten. Ing.-Arch. 36 (1968) pp. 387–402Google Scholar
  14. 14.
    Neuber, H.: Gekerbte und gelochte Scheiben mit Kraft- und Versetzungssingularitäten. Ing.-Arch. 37 (1968) pp. 1–9Google Scholar
  15. 15.
    Papkovich, P. F.: Solution générale des équations différentielles fondamentales d'élasticité, exprimée par trois fonctions harmoniques. C. R. Acad. Sci., Paris 195 (1932) pp. 513–515Google Scholar
  16. 16.
    Papkovich, P. F.: Expressions générales des composantes des tensions, ne refermant comme fonctions arbitraires que des fonctions harmoniques. C. R. Acad. Sci., Paris, 195 (1932) pp. 754–756Google Scholar
  17. 17.
    Neuber, H.: Ein neuer Ansatz zur Lösung räumlicher Probleme der Elastizitätstheorie. Der Hohlkegel unter Einzellast als Beispiel. Z. Angew. Math. Mech. 14 (1934) PP. 203–212Google Scholar
  18. 18.
    Mindlin, R. D.: Note on the Galerkin and Papkovich stress functions. Bull. Amer. Math. Soc. 42 (1936) PP. 373–376Google Scholar
  19. 19.
    Galerkin, B. G.: Contribution à la solution générale du problème de la théorie de l'élasticité dans le cas de trois dimensions. C. R. Acad. Sci., Paris, 190 (1930) pp. 1047–1048Google Scholar
  20. 20.
    Gurtin, M. E.: The linear theory of elasticity. Encyclopedia of Physics. Mechanics of Solids II, Flügge, S. (Chief ed.), Vol. VI a/2, 1–295, Berlin-Heidelberg-New York, 1972Google Scholar
  21. 21.
    Lamb, H.: Hydromechanics. Sixth Ed., Cambridge at the University Press, 1959Google Scholar

Copyright information

© Springer-Verlag 1975

Authors and Affiliations

  • J. J. Golecki
    • 1
  1. 1.Department of MechanicsTechnion-Israel Institute of TechnologyHaifaIsrael

Personalised recommendations