异质钛合金线性摩擦焊接接头拉伸过程数值模拟研究
Numerical Simulation of Tensile Process of Linear Friction Welded Joint of Heterogeneous Titanium Alloys
肖旋 1秦鼎强 1毛悦 1王心成 1李菊 2傅莉1
作者信息
- 1. 西北工业大学 凝固技术国家重点实验室,陕西 西安 710072
- 2. 中国航空制造技术研究院 航空焊接与连接技术航空科技重点实验室,北京 100024
- 折叠
摘要
基于线性摩擦焊(LFW)接头的组织特征及其材料性能,探索接头分区建模方法,采用有限元技术实现了TC11/TC17 异质钛合金LFW接头拉伸过程的数值模拟,揭示了接头拉伸过程中不同焊接区的应力应变演变规律,预测了接头的力学性能和断裂位置.结果表明,在 2000 N均布的拉伸加载条件下,可计算预测出TC11/TC17 异质钛合金LFW接头的屈服强度、抗拉强度分别为 1045、1082 MPa,与实际测量值的误差小于 2.5%.拉伸过程中接头在焊核区边缘存在应力峰值.在TC11 母材区距焊缝中心 24.2 mm位置存在应力和应变集中,应力集中区的应力值在 1057 MPa以上,应变最高可达 18.52%.该位置出现了颈缩现象,表明TC11/TC17 异质钛合金LFW接头在该位置发生断裂.
Abstract
The joint zoning modeling method was explored based on the microstructure characteristics and material properties of linear friction welding(LFW)joint,and the numerical simulation of tensile process of TC11/TC17 heterogeneous titanium alloy LFW joint was realized by using finite element technology.Meanwhile,the evolution law of stress and strain in different welding areas during tensile process was revealed,and the mechanical properties and fracture location of the joint were predicted.The results show that under the tensile loading condition of 2000 N uniformly distributed load,it is predicted by numerical calculation that the yield strength of TC11/TC17 heterogeneous titanium alloy LFW joint is 1045MPa and the tensile strength is 1082MPa,with an error of less than 2.5%compared with the actual measured value.The peak stress is located at the edge of the nugget zone of the joint,and there is stress and strain concentration in TC11 base metal at the position 24.2 mm away from the weld center,in which the stress value is more than 1057 MPa and the maximum strain can reach 18.52%.The necking phenomenon also occurs at this position,indicating that the TC11/TC17 heterogeneous titanium alloy LFW joint breaks at the position.
关键词
TC11/TC17钛合金/线性摩擦焊接/力学性能/纳米压痕Key words
TC11/TC17 titanium alloys/linear friction welding(LFW)/mechanical properties/nanoindentation引用本文复制引用
基金项目
国家科技重大专项(2017-Ⅶ-0005-0098)
陕西省重点研发计划(2020ZDLGY13-04)
出版年
2024
NETL
NSTL
万方数据