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作者机构:Kaunas Univ Technol LT-35212 Panevezys Lithuania
出 版 物:《NUCLEAR ENGINEERING AND DESIGN》 (核工程与设计)
年 卷 期:2011年第241卷第9期
页 面:3596-3604页
核心收录:
学科分类:08[工学] 0827[工学-核科学与技术]
主 题:LOADING Low cycle fatigue Materials loading Mechanical properties Sex Determination Processes CYCLIC STRAIN Caste determination fatigue curve WELD METAL structural materials Curves
摘 要:Over 280 structural materials used in the Russian nuclear power energy industry were tested at Kaunas University of Technology, as commissioned by St. Petersburg Central Research Institute of Structural Materials in the period of 1970-2000. Alloyed structural steels, stainless steels and metals of their welded joints with different types of thermal treatment were under research in the conditions of symmetric low cycle tension-compression (N = (1-2) x 10(4)) at room and elevated (200-350 degrees C) temperatures. During these experiments the characteristics of monotonic tension, cyclic stress-strain curves and low cycle fatigue curves, which are expressed by linear dependence of the total strain epsilon on the number of cycles N in co-ordinates log epsilon - log N, parameters C-1exp and m(1exp) were determined. The range of cycle strains epsilon when this low cycle fatigue curve may be used is determined. The definition of the approached values of low cycle fatigue curves parameters C-1cal and m(1cal) at room temperature by the mechanical characteristics of alloyed structural steels and their weld metals, stainless steels and their weld metals is analyzed in this work. The new relationships In C-1exp - m(1exp) among low cycle fatigue curves parameters, obtained by analyzing experimental data of 22-48 materials in each group, are determined. These relationships were used for determination of dependencies of low cycle parameters C-1cal and m(1cal) by the mechanical characteristics of analyzed groups of materials. From theoretically and experimentally determined equations by using calculated values C-1cal and m(1cal) dependencies for revision of Coffin-Manson fatigue curves parameters C and m were proposed. These parameters for the cyclically hardening or softening materials are calculated by estimating the equivalent value of the cycle plastic strain range. The proposed analytical dependencies make it possible to more exactly calculate the number of cycles N = N-0 (N-