期刊论文

Effect of VSR on Surface Integrity of Structural Parts

中文

振动、测试与诊断

1004-6801

2020

40

5

976-981

10.16450/j.cnki.issn.1004-6801.2020.05.022

51475483:国家自然科学基金 2018NK2065:湖南省重点研发计划资助项目 2019NK2022:湖南省重点研发计划资助项目

本校为第一机构

为揭示平台式振动时效对结构件材料表面完整性性能———表面残余应力、硬度及微观组织的影响,以7075铝合金薄壁件为研究对象,运用ANSYS构建平台式振动时效(vibration stress relief,简称VSR)有限元模型,通过模态分析获得最佳激振频率和试样装夹位置。在此基础上,将3个薄壁框架件置于平台不同位置进行VSR处理,得到其试样表面应力的松弛效果。结果表明:亚共振频率为112Hz时,在激振源的中间位置和最大振幅位置处试样应力释放效果最好,其应力释放率最大为27%;电子背散射衍射(electron backscattered diffraction,简称EBSD)电镜观察发现,时效后表面组织晶粒存在明显取向区变化,晶粒成长带来能量的变...

In order to reveal the influence of vibration stress relief(VSR)on the surface integrity including residual stress,hardness and microstructure of structural parts,the 7075aluminum alloy structural parts is taken as the research object.The software ANSYS is used to build VSR finite element model,the optimum excitation frequency and sample clamping position are obtained by modal analysis.On this basis, three thin-walled components are placed in different positions of the platform for VSR,and the effect of VSR on the surface properties of the samples is obtained.The results show that when the sub...