摘要
镍基合金的应力腐蚀开裂是核电站一回路中最重要的潜在安全隐患之一,考虑物理参数的随机性,基于氧化膜破裂理论,研究了镍基合金应力腐蚀裂尖力学特性的分散性规律。为了提高随机参数数值分析的效率,结合MATLAB和ABAQUS子模型技术的优点,完成了MATLAB对ABAQUS的二次开发,将有限元数值模拟和拉丁超立方抽样(LHS)方法相结合,获得了弹性模量、屈服强度等随机参数对应力腐蚀裂尖氧化膜和基体金属区域应力应变的影响规律,并验证了方法的可行性。结果表明,随机性的影响不容忽略,屈服应力的随机性对裂尖应力的分散性影响最大,而弹性模量的随机性对裂尖塑性应变分散性的影响最为显著。
Stress corrosion cracking(SCC) in nickel-based alloys is one of the most important potential safety hazards in primary circuit of nuclear power plants. Considering the randomness of physical parameters and based on the theory of oxide film rupture, the dispersion law of mechanical properties at SCC tip of nickel-based alloys was studied. To improve the efficiency of numerical analysis with random parameters, combining the advantages of MATLAB and sub-model technology of ABAQUS, MATLAB was employed in the secondary development for ABAQUS. With the help of finite element numerical simulation and Latin hypercube sampling(LHS) method, the effect of random parameters such as Young’s modulus and yield strength on the stress and strain of the oxide film region and the base metal region was investigated. Meanwhile, the feasibility of the method was verified. The results show that the influence of randomness should not be ignored. The randomness of yield stress has the greatest influence on the dispersion of stress at SCC tip, and the randomness of Young’s modulus has the most significant effect on the plastic strain dispersion at SCC tip.
作者
赵宽
薛河
赵凌燕
杨富强
Zhao Kuan;Xue He;Zhao Lingyan;Yang Fuqiang(Xi’an University of Science&Technology,Xi’an 710054,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2019年第12期3870-3875,共6页
Rare Metal Materials and Engineering
基金
National Natural Science Foundation of China(51811530311,11502195)
Scientific Research Program Funded by Shaanxi Provincial Education Department(17JK0508)
Natural Science Basic Research Plan in Shaanxi Province of China(2018JQ5193)
关键词
镍基合金
应力腐蚀开裂
拉丁超立方抽样
不确定性
nickel-based alloy
stress corrosion cracking
Latin hypercube sampling
uncertainty
