Registration Number
0222U000968,
(0119U101919)
, R & D reports
Title
Investigation of the influence of the characteristics of the distribution of residual stresses in the zone of composite welded joints on the calculated evaluation of the strength and life of the elements of the equipment of nuclear power plants
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Дослідження впливу залишкових напружень на працездатність композитних зварних з’єднань
Head
Oleg Makhnenko, Доктор технічних наук
Registration Date
22-01-2022
Organization
E. O. Paton Elektric Welding Institute National Academy of scinces of Ukraine
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» Investigate the influence of residual stresses in the zone of composite welded joints on the design assessment of the strength and life of elements of equipment of nuclear power plants and develop recommendations for the operational determination of the distributions of residual stresses in composite welded joints to include them in the current regulatory framework
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For composite welds of the WWER-1000 reactor vessel, finite element models have been developed to determine the stress state under the action of operating loads, namely internal pressure and temperature. In addition to the previously determined residual welding stresses, the operational and total stresses in the area of the welded joints were obtained. The estimated estimation of the influence of residual stresses on the efficiency of the considered welded joints with crack - like defects of material inconsistency under operational load is carried out. The critical condition of cracks of different sizes and locations was determined on the basis of a two-criteria approach to brittle-viscous fracture.
The results of the calculated evaluation showed that the residual welding stresses have a significant effect on the resistance to fracture of crack-like defects. According to the results of the calculations, the composite welds under consideration were moderately loaded under normal operating conditions, so their resistance to brittle failure is quite high. As a result of the research it was also determined that the HAZ material of ferritic-pearlitic materials at the interface with austenitic weld material is a dangerous area of composite welds due to microstructural phase transformations that occur during welding heating, in terms of ensuring the required level of mechanical properties and resistance to the formation of defects of inconsistency during long-term operation
Індекс УДК: 621.791:621.039
Product Description
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Basystyuk Nazar R
Velikovanenko Olena А.
Kandala Stepan M
Kostenevich Olena S.
Milenin Olexiy S
Mаkhnenko Oleh V.
Muzhychenko Olexander F
Tuesday Nina I
Raisin Galina P
Savitskaya Olena M
Saprykin Galina Yu
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2022-03-09
