The Paton Welding Journal, 2005, №08

2005 №08 (01)

2005 №08 (03)

---

The Paton Welding Journal, 2005, #8, 18-24 pages

Effect of non-relaxed residual stresses on load-carrying capacity and residual life of welded joints of pipings and equipment of nuclear power engineering objects

V.I. Makhnenko, E.A. Velikoivanenko, G.F. Rozynka, N.I. Pivtorak

E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine.

Abstract
The non-relaxed residual stresses in the presence of crack-like defects can influence greatly the decrease in load-carrying capacity and safe service of welded joints of pipings and elements of equipment of nuclear power engineering objects. This influence is growing largely in degradation of characteristics of resistance to brittle fracture KlC, KC and growth of corrosion cracks KlSCC in the process of service (repairs).
Keywords: nuclear power engineering, pipings and equipment, welded joint, non-relaxed residual stresses, diagram of fracture estimation, defects, growth of cracks, service life

References

1. Vinokurov, V.A. (1973) Tempering of welded structures for stress relaxation. Moscow: Mashinostroenie.
2. Lu, H., Wang, J., Murakawa, H. (1999) Mechanical behavior in local post weld heat treatment. Rep. 4. Transact, of JWRI, 28(1), 55–60.
3. McEneney, J.W. (1998) Recommended practices for local heating of welds in pipe and tubing. ANSI/AWS. D10-9X.
4. Wells, A.A. (1977) Effect of residual stresses on brittle fracture. In: Fracture. Vol. 5. Ed. by G. Libovits. Moscow: Mashinostroenie.
5. Harrison, R.P., Loosemore, K., Milne, J. et al. (1980) Assessment of the integrity of structure containing defects. In: Rep. R/H R6-Rev. 2. Central Electricity Generating Board. Berkeley.
6. Makhnenko, V.I., Makhnenko, O.V. (2000) Development of calculation procedures for assessment of allowable defects in welded joints of critical structures. The Paton Welding J., 9/10, 79–87.
7. Makhnenko, V.I. (2003) Improvement of methods for estimation of residual life of welded joints in durable structures. Ibid., 10/11, 107–116.
8. MR 125-01-90. Calculation of coefficients of stress intensity and section weakening for defects in welded joints. Kiev.
9. Andrejkiv, A.E. (1982) Three-dimensional problems of the ory of cracks. Kiev: Naukova Dumka.
10. RD EO 0353-02. Procedure of assessment of service life of bodies of nuclear WWER reactors during service of MRK-SKhP-2000. St-Petersburg-Moscow.
11. (1987) Current research on fatigue cracks Ed. by T. Tanaka et al. London-New York: Elsevier Appl. Sci.
12. Hobbacher, A. (1996) Recommendations for fatigue design of welded joints and components. IIW Doc. XIII-1539- 96/XV-845-96.
13. Horn, R.M., Kass, J.N., Rangantath, K. (1984) Evaluation of the growth and stability of stress corrosion cracking in sensitized austenitic pipings. J. Pressure Vessel Techn., 106(2), 201–208.
14. Hrivnyak, I. (1984) Weldability of steels. Moscow: Mashinostroenie.

---

Suggested Citation

V.I. Makhnenko, E.A. Velikoivanenko, G.F. Rozynka, N.I. Pivtorak (2005) Effect of non-relaxed residual stresses on load-carrying capacity and residual life of welded joints of pipings and equipment of nuclear power engineering objects. The Paton Welding J., 08, 18-24.

---