钛合金TA16弹塑性修正因子数值分析方法研究

Study on Numerical Analysis Method of Elastic-plastic Correction Factor for Titanium Alloy TA16

本文对核级规范提供的奥氏体不锈钢材料的弹塑性修正因子(KE)的各种敏感因素进行数值验算,确定了不锈钢材料Z2CND18.12(控氮)简化弹塑性疲劳分析所需KE与规范限值之间最小保守裕量为12%。基于钛合金TA16的单轴拉伸、应变循环和应力循环试验,确立了TA16在30℃和350℃的Chaboche本构模型参数。基于TA16的本构模型参数,对TA16开展各种敏感因素下的弹塑性分析,并参考奥氏体不锈钢的KE表达式和Z2CND18.12(控氮)的KE最小保守裕量迭代计算出TA16的相关系数。TA16的相关系数A、B、C、m、n分别为1.37、1.26、1.37、2.0和0.25。

Based on the elastic-plastic correction factor(KE)of austenitic stainless steel provided by the nuclear code,the sensitive parameters were analyzed.It is determined that the minimum conservative margin is 12% between simplified elastic-plastic fatigue analysis results and nuclear code limit of stainless steel Z2CND18.12(nitrogen control).The Chaboche constitutive model parameters of titanium alloy TA16 were obtained at 30℃ and 350℃ in view of the uniaxial tension,strain and stress cycling test results.The elastic-plastic analysis of TA16 under various sensitive factors was carried out and the correlation coefficients of KE for TA16 were derived by referring to the KE expression of austenitic stainless steel and KE minimum conservative margin of Z2CND18.12(nitrogen control).The correlation coefficients A,B,C,m and n of TA16 are 1.37,1.26,1.37,2.0 and 0.25,respectively.