摘要
利用瞬态热源、热循环曲线、全热循环、固有应变4种算法,依次对电弧增材典型框体构件变形和应力进行模拟,分析不同算法下的预测精度与计算效率。研究结果表明:瞬态热源算法预测的最大变形位置为框体顶部4个边角处,应力主要集中分布在框体拐角及顶部区域,与实验结果吻合良好,特征点变形与应力的预测精度分别为96.59%与95.01%,计算时间为326 h;热循环曲线算法的预测精度与瞬态热源算法相当,但计算时间缩短至117 h,预测的变形云图及应力曲线与实验结果吻合较好;相较于前两种算法,全热循环和固有应变算法对特征点变形的预测精度较低,分别为85.68%和65.86%,预测的变形云图与实验结果存在较大差异,可信度较低,但计算时间分别缩短至4 h和2 h,效率显著提高。
The deformation and stress of typical additively manufactured frame components are simulated by using transient heat source algorithm,thermal cycle curve algorithm,full thermal cycle algorithm and intrinsic strain algorithm,and the prediction accuracies and calculation efficiencies of the different algorithms are analyzed.The results show that the maximum deformation position predicted by the transient heat source algorithm is the top four corners of the frame,and the stress is mainly distributed in the corners and top areas of the frame,which is in good agreement with the experimental results,and the prediction accuracies of feature point deformation and stress are 96.59%and 95.01%,respectively,and the calculation time is 326 h;The prediction accuracy of the thermal cycle curve algorithm is comparable to that of the transient heat source algorithm,but the calculation time is shortened to 117 h,and the predicted deformation contour and stress curve are in good agreement with the experimental results.Compared with the first two algorithms,the prediction accuracies of the full thermal cycle and intrinsic strain algorithms for feature point deformation are 85.68%and 65.86%,respectively,and the predicted deformation contour is quite different from the experimental results.The reliabilityies of the full thermal cycle and intrinsic strain algorithms are low,but their calculation times are shortened to 4 h and 2 h,respectively,and their efficiencies are significantly improved.
作者
李青松
王磊
赵宁
张笑天
张磊
王克鸿
LI Qingsong;WANG Lei;ZHAO Ning;ZHANG Xiaotian;ZHANG Lei;WANG Kehong(School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China;National Key Laboratory of Integrated Technology for Special Vehicle Design and Manufacturing,Baotou 014030,Inner Mongolia,China)
出处
《兵工学报》
北大核心
2025年第7期259-267,共9页
Acta Armamentarii
基金
特种车辆设计制造集成技术全国重点实验室基金项目(GZ2023KF009)。
关键词
电弧增材
数值模拟
变形
应力
wire arc additive manufacturing
numerical simulation
deformation
stress
