基于Kriging模型的贮箱结构裂纹扩展快速分析  

Rapid Analysis on the Crack Propagation in Storage Tank Structures Based on the Kriging Model

作　　者：范浩然 王烬余 王祥硕 张文丰 刘涛 王冲[1,2] FAN Haoran;WANG Jinyu;WANG Xiangshuo;ZHANG Wenfeng;LIU Tao;WANG Chong(School of Aeronautic Science and Engineering,Beihang University,Beijing 100191,China;Tianmushan Laboratory,Hangzhou 311115,Zhejiang,China;Aerospace System Engineering Shanghai,Shanghai 201109,China)

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100191 [2]天目山实验室,浙江杭州311115 [3]上海宇航系统工程研究所,上海201109

出　　处：《上海航天(中英文)》2025年第2期135-143,共9页Aerospace Shanghai(Chinese&English)

基　　金：国防基础科研计划资助项目(JCKY2023203A002)。

摘　　要：针对运载火箭贮箱焊接结构的疲劳裂纹扩展问题,提出了基于Kriging模型实现结构裂纹扩展寿命的快速预测方法。在贮箱有限元建模基础上,应用ABAQUS与FRANC3D联合仿真方法,研究初始裂纹在不同区域、应力比和倾斜角下的裂纹扩展规律。结果表明:焊缝区疲劳裂纹扩展寿命低于热影响区与母材区,纵向焊缝区裂纹扩展寿命低于环向焊缝区;纵向焊缝区裂纹扩展寿命随着应力比增大而延长,在初始倾斜角为0°时疲劳寿命最长。以纵向焊缝区初始裂纹位置、倾斜角、应力比等参数作为输入,以疲劳裂纹扩展寿命作为输出,建立高精度Kriging模型,实现贮箱焊接结构裂纹扩展寿命的快速预测。结果表明:与扩展有限元方法相比,该方法在保证计算误差较低的前提下缩短寿命预测时间10倍以上。To address the issue of fatigue crack propagation in the welded structures of rocket storage tanks,a rapid prediction method for the structural fatigue life based on the Kriging model is proposed.A scaled finite element model is established for such a tank,and joint simulations with the ABAQUS and FRANC3D software are conducted to study the crack propagation behavior of the initial cracks under different regions,stress ratios,and inclination angles.The results show that the crack propagation rate in the weld zone is higher than those in the heat-affected zone and base material zone.The crack propagation rate in the longitudinal weld zone is higher than that in the circumferential weld zone.The crack propagation rate in the longitudinal weld zone increases as the stress ratio decreases,and the fatigue life is the longest when the initial inclination angle is 0°.A high-accuracy Kriging model is developed,taking the initial crack location in the longitudinal weld zone,the inclination angle,and the stress ratio as the inputs and the fatigue crack propagation life as the output.The model enables rapid prediction for the crack propagation life in the welded structure of a storage tank.The results show that compared with the extended finite element method,the proposed method can shorten the life prediction time by more than 10 times while ensuring low calculation errors.

关 键 词：贮箱焊接结构 疲劳裂纹扩展 ABAQUS与FRANC3D联合仿真 KRIGING模型 寿命快速预测 

分 类 号：O346[理学—固体力学]