Study on A508 steel constraint related fracture toughness of nuclear power main pipeline under different vertical earthquake loads
YANG Jie
YUAN Hongwei
GUO Guoliang
CUI Wei
CHEN Haofeng
Abstract：Considering cracks of various length and depth(various constraints)on the nuclear power main pipeline as the research object,through the mass acceleration application method,applying vertical load of 5 earthquake intensities and 3 real earthquakes to the nuclear power main pipeline under varying constraints respectively,and based on a method to determine the constraint related to fracture toughness of the actual structure,the calculation of constraint related fracture toughness was performed,the various constraint under various vertical earthquake loads related crack toughness was systematically studied.The results show that under the same constraint,the crack opening force curve shifts to the left with the increase of earthquake intensity,and the constraint related fracture toughness decreases gradually.With an increased crack length,the effect of earthquake intensity on constraint related fracture toughness becomes more obvious.With an increased crack depth,the effect of earthquake load on constraint related fracture toughness firstly becomes obvious,and then becomes insignificant.Under different constraints,the influence trend of the real earthquake load on constraint related fracture toughness is the same as that of the earthquake intensity,and has a certain relation with the magnitude and earthquake acceleration time history curve.
Keywords：ConstraintFracture toughnessVertical earthquake loadNuclear power main pipeline
Publication Date：2025-04-14
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：9( 1-9 )