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第二届热问题计算方法国际会议

作者： Junhui Zhang Zhihai Xiang Yinghua Liu Mingde Xue AML Tsinghua University Beijing 100084 China

＜正＞The thermally-induced deformation of flexible space structures could be suppressed by controlling the temperature difference on certain cross-sections of these kinds of thin-walled structures.For this purpose,one must optimizes the applied heat flux to control the temperature difference and deformation of thin-walled structures.This optimization procedure could be very time consuming, because the radiation analysis has to be conducted in each iteration step.However,this problem can be greatly remedied with the help of the Fourier temperature finite element,which has been proposed in our early work.Based on this element,this paper develops a heat flux optimization method to control the thermally-induced deformation of thin-walled structures.A numerical example demonstrates the validity and efficiency of the proposed method.

关键词： thin-walled structures Finite Elements Thermally-induced deformation Control

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A thermal-flutter criterion for an open thin-walled circular cantilever beam subject to solar heating

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Chinese Journal of Aeronautics 2018年第9期31卷 1902-1909页

作者： Xiaode YUAN Zhihai XIANG Department of Engineering Mechanics School of Aerospace EngineeringTsinghua University

The flexible attachments of spacecraft may undergo Thermally Induced Vibration(TIV)on orbit due to the suddenly changed solar heating. The unstable TIV, called thermal-flutter, can cause serious damage to the spacecraft. In this paper, the coupled bending-torsion thermal vibration equations for an open thin-walled circular cantilever beam are established. By analyzing the stability of these equations based on the first Lyapunov method, the thermal-flutter criterion can be obtained. The criterion is very different form that of closed thin-walled beams because the torsion has great impact on the stability of the TIV for open thin-walled beams. Several numerical simulations are conducted to demonstrate that the theoretical predictions agree very well with the finite element results, which mean that the criterion are reliable.

关键词： Fourier finite element Stability criteria Thermal flutter Thermally Induced Vibration（TIV） thin-walled structures

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GEOMETRICALLY NONLINEAR FINITE ELEMENT MODEL OF SPATIAL thin-walled BEAMS WITH GENERAL OPEN CROSS SECTION

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Acta Mechanica Solida Sinica 2009年第1期22卷 64-72页

作者： Xiaofeng Wang Qingshan Yang School of Civil Engineering Beijing Jiaotong University Beijing 100044 China

Based on the theory of Timoshenko and thin-walled beams, a new finite element model of spatial thin-walled beams with general open cross sections is presented in the paper, in which several factors are included such as lateral shear deformation, warp generated by nonuni- form torsion and second-order shear stress, coupling of flexure and torsion, and large displacement with small strain. With an additional internal node in the element, the element stiffness matrix is deduced by incremental virtual work in updated Lagrangian （UL） formulation. Numerical examples demonstrate that the presented model well describes the geometrically nonlinear property of spatial thin-walled beams.

关键词： spatial beams thin-walled structures geometrically nonlinear finite element stiffness matrix

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陈誉博士2015年在国际权威期刊《thin-walled structures》连续发表5篇学术论文

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长江大学学报(自然科学版) 2015年第19期 61-61页

2015年,长江大学城市建设学院陈誉博士以第一作者和通讯作者身份、长江大学城市建设学院为第一单位,在国际著名钢结构杂志《thin-walled structures》连续发表5篇学术论文:《、《Behaviour of bird-beak square hollow section X-joints... 详细信息

2015年,长江大学城市建设学院陈誉博士以第一作者和通讯作者身份、长江大学城市建设学院为第一单位,在国际著名钢结构杂志《thin-walled structures》连续发表5篇学术论文:《、《Behaviour of bird-beak square hollow section X-joints under in-plane bending》Experimental andfinite element analysis research on cold-formed steel lipped channel beams under web crippling》、《Behaviour of square hollow section brace-H-shaped steel chord T-joints under axial compression》、《Aluminum tubular sections subjected to web crippling》和《Numerical investigation of concrete-

关键词：学术论文权威期刊陈誉 thin-walled structures 博士

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Nonlinear Finite Element Analysis of thin-walled Beam on Pre- and Post-Buckling Stiffness and Gauge Sensitivity Index

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Journal of Applied Mathematics and Physics 2022年第5期10卷 1432-1442页

作者： Shengyong Zhang Department of Mechanical and Civil Engineering College of Engineering and Sciences Purdue University Northwest Hammond USA

Lightweight design has a significant impact on reducing fuel consumption and harmful emission of conventional vehicles and improving driving range of electric vehicles. Reducing the thickness of components in vehicle bodies and closures is an efficient approach for weight reduction. Thickness reduction, however, will reduce structural stiffness, especially in the presence of lateral displacements of buckling when critical stress is reached. In this paper, nonlinear FEA models of a thin-walled beam with variable thickness are developed for calculating the changes of beam stiffness as to thickness reduction in the pre- and post-buckling stages. Next, these stiffness values are used to calculate gauge sensitivity of the beam, which changes with respect to beam thickness changes. It is concluded that the presence of buckling will reduce the beam stiffness, worsen the stress uniformity, and increase the gauge sensitivity value of the beam.

关键词： FEA Local Buckling Gauge Sensitivity thin-walled structures

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