Strength of Materials

, Volume 29, Issue 3, pp 236–247 | Cite as

Prediction of fracture toughness for heat-resistant steels considering specimen dimensions. Report 4. Fracture toughness after plastic prestraining of materials with cracks

  • V. T. Troshchenko
  • V. V. Pokrovsky
  • V. G. Kaplunenko
Scientific and Technical Section
Received:
  • 32 Downloads

Abstract

The paper presents the results of an experimental investigation of the influence of warm prestressing (WPS) on fracture toughness characteristics of large-size specimens. The WPS has been found to be an efficient method for enhancing brittle fracture resistance of large-size bodies from the investigated materials and can be recommended for practical realization in nuclear reactors and other critical structures whose brittle fracture is impermissible both in the process of normal operation and in emergency situations. The optimum temperature-loading regime of the WPS is defined by both the properties of a given material and its thickness which governs the intensity of plastic deformation in the process of WPS. Based on the established mechanisms of the WPS effect, a physicomechanical model has been developed for the prediction of fracture toughness for pressure-vessel heat-resistant steels after WPS taking into account the influence of the stress state at the crack tip. The model makes it possible to predict fracture toughness for large-size bodies subjected to WPS with the given temperature and loading regimes from the results of testing small laboratory specimens. The most optimum regimes of the WPS can also be determined using this model and even those for several materials making up a structural component and subjected to the WPS.

Keywords

Fracture Toughness Steel 15Kh2MFA Plastic Prestraining Brittle Fracture Resistance Fracture Toughness Characteristic 
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.
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References

  1. 1.
    V. T. Troshchenko, V. V. Pokrovsky, and V. G. Kaplunenko, “Prediction of fracture toughness for heat-resistant steels considering specimen dimensions. Report 1. The results of the experimental investigation,”Probl. Prochn., No. 1, 5–25 (1997).Google Scholar
  2. 2.
    V. T. Troshchenko, V. V. Pokrovsky, and V. G. Kaplunenko, “Prediction of fracture toughness for heat-resistant steels considering specimen dimensions. Report 2. Ductile fracture,”Probl. Prochn., No. 2, 5–19 (1997).Google Scholar
  3. 3.
    V. T. Troshchenko, V. V. Pokrovsky, and V. G. Kaplunenko, “Prediction of fracture toughness for heat-resistant steels considering specimen dimensions. Report 3. Brittle fracture,”Probl. Prochn., No. 2, 21–31 (1997).Google Scholar
  4. 4.
    P. V. Yasniy,Fracture Toughness of Plastically Prestrained Structural Alloys, Ph.D. Thesis, Kyiv (1990).Google Scholar
  5. 5.
    J. J. McGowan, “Application of warm prestressing effects to fracture mechanics analyses of nuclear reactor vessel during severe thermal shock,”Nucl. Eng. Design.,51, 431–444 (1979).CrossRefGoogle Scholar
  6. 6.
    L. P. Harrop, “Warm prestressing during severe thermal shock of a pressure vessel,”Int. J. Press. Vess. Piping,7, 463–468 (1979).CrossRefGoogle Scholar
  7. 7.
    D. A. Curry”A micromechanistic approach to warm prestressing of ferritic steels,”Int. J. Fract.,17, No. 3, 335–343 (1981).CrossRefGoogle Scholar
  8. 8.
    G. G. Chell, “Some fracture mechanics applications of warm prestressing to pressure vessels,” Proc. 4th Int. Conf. Press. Vessel Technology. London. 117–124 (1980).Google Scholar
  9. 9.
    G. G. Chell and J. R. Haigh, “The effect of warm prestressing of proof tested pressure vessels,”Int. J. Press. Vess. Piping,23, 121–132 (1986).CrossRefGoogle Scholar
  10. 10.
    D. A. Curry, “A model for predicting the influence of warm prestressing and strain ageing on the cleavage fracture toughness of ferritic steels,”Int. J. Fract.,22, 145–159 (1983).CrossRefGoogle Scholar
  11. 11.
    H. Nakamura, H. Kobayashi, T. Kodaira, and H. Nakazawa, “On the effect of pre-loading on fracture toughness of A-533B-1,” Adv. Fract. Res. Prepr.: Proc. 5th Int. Conf. Fract., Oxford: Pergamon Press,2, 825–831 (1982).Google Scholar
  12. 12.
    F. M. Beremin, “Numberical modelling of warmprestress effect using a damage function of cleavage fracture,” Adv. Fract. Res. Prepr.: Proc. 5th Int. Conf. Fract., Oxford: Pergamon Press,2, 825–831 (1982).Google Scholar
  13. 13.
    G. G. Chell, J. R. Haigh, and V. Vitek, “A theory of warm prestressing: experimental validation and the implications for elasic-plastic failure criteria,”Int. J. Fract.,17, No. 1, 61–81.Google Scholar
  14. 14.
    G. Hedner, “Influence of superimposed fatigue loads on the effect of warm prestressing,” Adv. Fract. Res. Prepr.: Proc. 6th Int. Conf. Fract., Oxford: Pergamon Press,4, 1975–1982 (1984).Google Scholar
  15. 15.
    L. A. Bondarovich, A. N. Shuvalov, V. V. Bogachev, and A. I. Litvinov, “Influence of plastic prestraining on the conditions of crack nucleation and propagation in the stress concentration zones under reloading,” Trudy Mosc. Inzh.-Stroit. Inst., No. 183, 152–160 (1983).Google Scholar
  16. 16.
    V. A. Kiselyov and E. Yu. Ryvkin, “The effect of warm prestressing on the brittle fracture resistance of structural elements,”Energomashinostroyenie, No. 10, 16–18 (1988).Google Scholar
  17. 17.
    T. S. Harrison and D. D. Firnehough, “Influence of the preloading on brittle fracture of components with sharp defects” [in Russian translation],Teoret. Osnovy Inzh. Raschetov, No. 2, 130–134 (1972).Google Scholar
  18. 18.
    F. I. Loss, R. A. Gray, and I. R. Hawthorne, “Significance of warm prestress to crack initiation during thermal shock,”Nucl. Eng. Design,48, No. 2, 395–408 (1978).CrossRefGoogle Scholar
  19. 19.
    Y. Katz, A. Bussiba, and H. Mathias, “Effect of warm prestressing on fatigue crack growth curves at low temperatures,” Proc. Symp. Fatig. Low Temperatures, Louisville, 191–209 (1985).Google Scholar
  20. 20.
    G. G. Chell, “The effect of sub-critical crack growth on the fracture behaviour of cracked ferritic steels after warm prestressing,”Fatig. Fract. Eng. Mater. Struct.,9, No. 4, 259–274 (1986).CrossRefGoogle Scholar
  21. 21.
    F. Mudry, “Cleavage fracture and transition: application to the warm-prestress effects,”Elastic-Plastic Fracture Mechanics, Brussels, 303–325 (1985).Google Scholar
  22. 22.
    G. G. Chell and V. Vitek, “The J-integral as a fracture criterion: perhaps it doesn't mean what you thought it meant,”Int. J. Fract.,13, 882–886 (1977).CrossRefGoogle Scholar
  23. 23.
    V. T. Troshchenko, V. V. Pokrovsky, V. G. Kaplunenko,et al., “The effect of metallurgical factors on crack resistance of pressure-vessel materials,”Nucl. Eng. and Desing,135, 235–237 (1992).Google Scholar
  24. 24.
    V. V. Pokrovsky, V. T. Troshchenko, V. G. Kaplunenko,et al., “A promising method for enhancing resistance of pressure vessels to brittle fracture,”Int. J. Pres. Ves. and Piping,58, 9–24, (1994).CrossRefGoogle Scholar
  25. 25.
    R. O. Ritchie, J. F. Knott, and J. R. Rice, “On the relation between critical tensile stress and fracture toughness,”J. Mech. Phys. Solids,21, No. 6, 393–410 (1973).Google Scholar
  26. 26.
    G. S. Pisarenko and A. J. Krasowsky, “Analysis of kinetics of quasibrittle fracture of crystalline materials,” Mech. Behaviour of Materials. Proc. Int. Conf. Mech. Behav. Mater. (Kyoto, 1971), Kyoto (1972), V. I., pp. 421–432.Google Scholar
  27. 27.
    A. J. Krasowsky and G. Pluvinage, “Structure parameters governing fracture toughness of engineering materials,”Phys. Chem. Mech. Mater.,29, No. 3, 113–123 (1993).Google Scholar
  28. 28.
    M. Creager and P. C. Paris, “Elastic field equation for blunt cracks with reference to stress corrosion cracking,”Int. J. Fract. Mech.,3, No. 2, 247–252 (1967).Google Scholar
  29. 29.
    V. Kumar, M. D. German, and C. F. Shih,An Engineering Approach for Elastic-Plastic Fracture, EPRI Report NP1931 (1981).Google Scholar
  30. 30.
    D. M. Parks, V. Kumar, and C. F. Shih, “Consistency checks for power-law calibration functions,”ASTM STP, No. 803, P. 1, 379–383 (1983).Google Scholar
  31. 31.
    C. F. Shih and A. Needleman, “Fully plastic crack problems, Pt. 2. Application of consistency checks,”J. Appl. Mech.,51, 57–64 (1984).Google Scholar
  32. 32.
    G. J. Rodin and D. M. Parks, “On consistency relations in non-linear fracture mechanics,”J. Appl. Mech.,53, 834–838 (1986).CrossRefGoogle Scholar
  33. 33.
    N. L. Goldman and J. W. Hutchinson, “Fully plastic crack problems: the centre-cracked strip under plane strain,”Int. J. Solids Structures,11, 575–591 (1975).CrossRefGoogle Scholar
  34. 34.
    C. F. Shih and J. W. Hutchinson, “Fully plastic solution and large-scale yielding estimates for plane stress crack problems,”J. Engng. Mat. Technology,98, 289–295 (1976).Google Scholar
  35. 35.
    M. P. Ranaweera and F. A. Leckie, “J-integrals for some crack and notch geometries,”Int. J. Fract.,18, 3–18 (1982).CrossRefGoogle Scholar
  36. 36.
    A. G. Miller and R. A. Ainsworth, “Consistency of numerical results for power-law hardening materials and the accuracy of the reference stress approximation for J-integrals,”Eng. Fract. Mech.,32, No. 2, 233–247 (1989).CrossRefGoogle Scholar
  37. 37.
    R. A. Ainsworth, “The assessment of defects in structures of strain hardening material,”Eng. Fract. Mech.,19, No. 4, 633–642 (1984).CrossRefGoogle Scholar

Copyright information

© Plenum Publishing Corporation 1997

Authors and Affiliations

  • V. T. Troshchenko
    • 1
  • V. V. Pokrovsky
    • 1
  • V. G. Kaplunenko
    • 1
  1. 1.Institute for Problems of StrengthNational Academy of Sciences of UkraineKyivUkraine

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