摘要
研究了大尺寸4层中空结构内部芯层混合网格设计及热-力耦合作用下结构整体的静力强度分析。通过高温拉伸测试研究了TA15钛合金材料的超塑变形行为,最大伸长率为1340%(900℃、 0.001 s^(-1)),并建立了该温度条件下的Backofen本构方程。通过有限元分析方法研究几何参数对网格单元特征超塑性变形性能及承载性能的影响规律,进行中空结构混合网格优化设计及强度分析。结果表明,服役条件下,最大应力发生在中空结构夹持区,此处由于受到弯扭耦合影响,易产生应力集中,应力分布显示中空结构符合强度设计要求,纵向上分布有4级特征六边形单元网格(网格尺寸为19 mm)的优化方案工艺实现性较好,同时符合刚度设计要求,结构最大变形位移为8.609 mm。
The hybrid grid design of the inner core layer of the large-size four-layer hollow structure and the static strength analysis of the whole structure under the action of thermal-mechanical coupling were studied.The superplastic deformation behavior of TA15 titanium alloy was studied by high temperature tensile test.The maximum elongation was 1340%(900°C,0.001 s-1).The Backofen constitutive equation was established at this temperature.The finite element analysis method was used to study the influence of geometric parameters on the superplastic deformation performance and bearing capacity of the mesh element,and the optimization design and strength analysis of the hollow structure hybrid mesh were carried out.The results show that the maximum stress occurs in the clamping zone of the hollow structure under the service condition,where the stress concentration is easy to occur due to the coupling effect of bending and torsion.The stress distribution shows that the hollow structure meets the strength design requirements.The optimization scheme with four-level characteristic hexagonal unit grids(grid size of 19 mm)distributed in the longitudinal direction has better process realization,and meets the stiffness design requirements.The maximum deformation displacement of structure is 8.609 mm.
作者
邢宇涵
蒋少松
刘太盈
张宁
刘遇鹏
刘易成
XING Yu-han;JIANG Shao-song;LIU Tai-ying;ZHANG Ning;LIU Yu-peng;LIU Yi-cheng(National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin 150001,China;Beijing Xinghang Mechanical-Electric Equipment Co.,Ltd.,Beijing 100074,China;Harbin Yuhang Jingchuang Technology Co.,Ltd.,Harbin 150001,China)
出处
《塑性工程学报》
北大核心
2025年第10期265-273,共9页
Journal of Plasticity Engineering
关键词
4层中空结构
混合网格
优化设计
强度分析
four-layer hollow structure
hybrid grid
optimization design
strength analysis
