摘要
为探究不同超声喷丸参数对7055-T7751铝合金板件曲率变形、表面形貌以及残余应力分布的影响规律,基于ABAQUS软件建立了三步法有限元仿真模型,简化了超声喷丸成形过程,并通过铝合金试样的超声喷丸成形试验,研究了喷丸时间、真空试验环境等因素对板件成形结果的影响,进一步探究了喷丸处理后试验件表面微观形貌和残余应力的分布情况。实验结果表明,在板件成形过程中,超声喷丸能够在板件内部形成有效的压缩残余应力分布,对表面形貌也具有一定的改善效果。但是,喷丸成形存在一定的饱和喷丸时间,达到饱和喷丸时间之后的成形效果不会发生显著变化。本文提出的数值仿真模型与试验结果为研究航天飞行器壁板超声喷丸成形工艺提供必要的基础支持。
In order to explore the influence of ultrasonic peen forming(UPF)parameters on the curvature deformation,surface morphology and residual stress distribution of 7055-T7751 aluminum alloy workpiece,a three-step finite element simulation model is established based on ABAQUS to simplify the UPF process in this paper.The effects of peen time,experiment environment and other factors on the forming results are studied through UPF experiments.The changes of surface micro morphology and the distribution of residual stress after peen forming treatment are also investigated.Experimental results reveal that the UPF is validated to modify surface micro morphology and generate sufficient compressive residual stress.Once reaching the steady state for UPF,increasing impact time will not change the arc height infinitely in the process.The presented numerical simulation model along with experimental results presented in this paper provide necessary guidelines for the study of ultrasonic peen forming process of spacecraft wall panels.
作者
芦小龙
钱丰
孙志峻
施陆锴
李武琴
Lu Xiaolong;Qian Feng;Sun Zhijun;Shi Lukai;Li Wuqin(State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016)
出处
《航天制造技术》
2022年第3期1-5,共5页
Aerospace Manufacturing Technology
基金
国家自然科学基金资助项目(51975278)
机械结构力学及控制国家重点实验室基金资助项目(MCMS-I-0321G01)
国家商飞制造工程技术研究中心创新基金项目(COMAC-SFGS-2020-3)
