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Analysis of longitude profiled rolling process of Cu/Al cladded sheet and evaluation of outlet warpage

Journal of Iron and Steel Research(International) 2022年第6期29卷 973-982页

作者： Jing-na Sun Chi Chen Shuo Wang Guan-nan Liu Hua-gui Huang National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao 066004HebeiChina Xinxiang Aviation Industry(Group)Co. Ltd.Xinxiang 453000HenanChina Harbin Dongan Engine Co. Ltd.Harbin 150060HeilongjiangChina

Longitude profiled cladded sheet is obtained by rolling bimetal cladded sheet with variable gauge rolling technology.The longitude profiled rolling process of Cu/Al cladded sheets was studied by finite element method and experiments.The rolling force rises with the increase in reduction,and a sudden change appears at the end of the thickness variation zone.The thickness ratio of copper layer is enlarged after rolling owing to its relatively large deformation resistance and continues to rise with the increase in reduction rate.Lower elongation of copper side leads to the warpage of exit metal to copper side,which further hinders the deformation of copper.The influence of asymmetric rolling parameters indicates that increasing the work roll diameter ratio,speed radio,and friction coefficient on Al side can reduce the warpage when the reduction rate is below a certain value depending on the thickness ratio and other rolling parameters.Comparison of experiments and simulation results showed good agreement and verified the finite element model.

关键词： Longitude profiled rolling Cladded sheet Rolling force Layer thickness ratio Outlet warpage Asymmetric rolling

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Longitudinally profiled plate leveling theory based on linear decreasing leveling scheme

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Journal of Iron and Steel Research(International) 2019年第2期26卷 130-136页

作者： Jian-liang Sun Xing-ming Du Kai Li Yan Peng National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao 066004HebeiChina State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004HebeiChina

An an alytical model based on linear decreasi ng leveli ng scheme was proposed to inv estigate the longitu din ally profiled plate leveling process.Considering the variable cross-sectional thickness of longitudinally profiled plate and the dynamic reductions in leveling rolls,the reduction models of upper and lower rolls,the leveling force model and the leveling moment model were established,respectively,based on linear decreasing leveling scheme.Moreover,the finite element model of longitudinally profiled plate leveling process was established based on ABAQUS.Then,the total displacements of upper and lower rolls,the leveling force and the stress distribution of longifudinally profiled plate in the leveling process were calculated.To verify the validity of the proposed models,calculated leveling forces were compared with the measured values,and very good agreements are found.Calculated results show that linear decreasing leveling scheme is suitable for leveling longitudinally profiled plate.

关键词： Longitudi nally profiled plate Lin ear decreasing leveling Dynamic reduction Residual stress

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Semi-analytical method for calculating aeroelastic effect of profiled rod flying at high velocity

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Defence Technology（防务技术） 2015年第1期11卷 85-92页

作者： Hui-jun NING Nan-peng FENG Tan-hui WU Cheng ZHANG Hao WANG School of Energy and Power Engineering Nanjing University of Science and Technology The Graduate School of Hubei Aerospace Technology Academe Dept.of Engineering Mechanics Shanghai Jiaotong University

The key technique of a kinetic energy rod(KER) warhead is to control the flight attitude of rods. The rods are usually designed to different shapes. A new conceptual KER named profiled rod which has large L/D ratio is described in this paper. The elastic dynamic equations of this profiled rod flying at high velocity after detonation are set up on the basis of Euler-Bernoulli beam, and the aeroelastic deformation of profiled rod is calculated by semi-analytical method for calculating the vibration characteristics of variable cross-section beam. In addition, the aeroelastic deformation of the undeformed profiled rod and the aeroelastic deformation of deformed profiled rod which is caused by the detonation of explosive are simulated by computational fluid dynamic and finite element method(CFD/FEM), respectively. A satisfactory agreement of these two methods is obtained by the comparison of two methods. The results show that the semi-analytical method for calculating the vibration characteristics of variable cross-section beam is applied to analyze the aeroelastic deformation of profiled rod flying at high velocity.

关键词： profiled rod Detonation process Variable cross-section beam Aeroelastic deformation Numerical analysis

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