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Buckle Propagation in Steel Pipes of Ultra-high Strength:Experiments,Theories and Numerical Simulations

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Acta Mechanica Solida Sinica 2020年第4期33卷 546-563页

作者： Haofeng Liang Jiahui Zhou Jixin Lin Fusong Jin Fei Xia Jianghong xue jiachu xu School of Civil and Construction Engineering Jinan University/Key Lab of Disaster Forecast and Control in EngineeringMinistry of EducationGuangzhou 510632China

In this paper,experimental,theoretical and numerical approaches were employed to scrutinize the buckle propagation events occurring in pipes subjected to external *** groups of samples with different radius-to-thickness ratios were fabricated using steel pipes of ultra-high strength and were subjected to compression of external pressure in a sealed pressure vessel specially designed and customized for the *** results were recorded through a data acquisition *** facilitating the theoretical calculations,uniaxial tensile tests were performed on tensile pieces cut from the same pipes to obtain the material *** was found from the experimental results that once a buckle is initiated in a pipe,the external pressure dropped to a specific value called buckle propagation pressure and kept at this level until the whole pipe is flattened into a dog-bone *** on the measured material properties and geometric parameters,theoretical solutions were computed using established ring models and shell model,and finite element predictions were also obtained from ABAQUS *** efficiency and accuracy of the shell model and finite element model were expounded by comparing various theoretical solutions and numerical predictions with the experimental *** the authenticated shell model and finite element model,a deep insight into the phenomenon of buckle propagation of pressurized long pipes was provided by performing a series of parametric study.

关键词： Steady-state buckle propagation.Ring model Shell model Subsea pipes External pressure

Analysis of Thermo-Magneto-Elastic Nonlinear Dynamic Response of Shallow Conical Shells

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Engineering（科研） 2018年第12期10卷 837-850页

作者： Shende Cen jiachu xu School of Mechanics and Construction Engineering Jinan University Guangzhou China

The dynamic response study on thermo-magneto-elastic behavior of shallow conical shell in a time-dependent magnetic field is investigated, and the dynamic responses of displacement of shallow conical shell under mechanical loads, electromagnetic fields and temperature field coupling are analyzed. Based on Maxwell’s equations, heat conduction equation and nonlinear equations of classical plates and shells, the nonlinear dynamic response governing equations are derived. The electromagnetic field and temperature field equations are solved using variable separating technique, the nonlinear elastic field equations are solved by Galerkin method. The variation of temperature, magnetic field intensity and displacement with time under the coupling effect of the applied magnetic field and the surface uniform load were obtained. The influence of frequency of the applied magnetic field on the displacement wave forms is discussed.

关键词： Thermo-Magneto-Elastic Shallow Conical Shell Nonlinear Dynamic Response Galerkin Method

复合材料层合开顶扁球壳在集中冲击下的非线性动力屈曲

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振动与冲击 2007年第1期26卷 1-3,7页

作者：徐加初杨增涛暨南大学力学与土木工程系广州510632

研究了具有刚性中心的复合材料层合开顶扁球壳在中心集中冲击载荷作用下的非线性动力屈曲问题。通过增加横向转动惯量项得到中心集中冲击下复合材料层合开顶扁球壳非线性稳定性的控制方程,采用Galerk in方法得到以刚性中心位移表达的冲... 详细信息

研究了具有刚性中心的复合材料层合开顶扁球壳在中心集中冲击载荷作用下的非线性动力屈曲问题。通过增加横向转动惯量项得到中心集中冲击下复合材料层合开顶扁球壳非线性稳定性的控制方程,采用Galerk in方法得到以刚性中心位移表达的冲击动力响应方程,并用Runge-Kutta方法进行数值求解,应用Bud iansky-Roth准则(简称B-R准则)确定冲击屈曲的临界荷载;讨论了壳体几何尺寸对复合材料层合开顶扁球壳冲击屈曲的影响。

关键词：复合材料层合开顶扁球壳动力屈曲矩形脉冲 Budiansky—Roth准则 Galerkin方法

剪切变形对直线型正交异性层合圆板大幅度受迫振动的影响

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应用数学和力学 1998年第2期19卷 105-112页

作者：徐加初刘人怀南京航空航天大学暨南大学

本文研究了计及横向剪切变形的直线型正交异性层合圆板在简谐载荷ｑ０ｃｏｓωｔ作用下的非线性受迫振动问题·采用伽辽金方法得到强振频率与振幅关系的解析解·最后，分析了横向剪切对板振动的影响，并给出了板的非线性自由振动的非线... 详细信息

本文研究了计及横向剪切变形的直线型正交异性层合圆板在简谐载荷ｑ０ｃｏｓωｔ作用下的非线性受迫振动问题·采用伽辽金方法得到强振频率与振幅关系的解析解·最后，分析了横向剪切对板振动的影响，并给出了板的非线性自由振动的非线性周期对线性周期的比值·

关键词：受迫振动层合圆板正交异性剪切变形

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具有压电元件圆薄板传感器的非线性弯曲

辽宁工程技术大学学报（自然科学版） 2012年第2期31卷 260-263页

作者：王浩徐加初暨南大学理工学院广东广州510632 暨南大学应用力学研究所广东广州510632

为解决在作用电压和机械力的耦合载荷作用下具有压电元件圆薄板传感器的非线性弯曲问题,基于VonKarman薄板非线性理论和压电本构方程,导出具有压电元件圆薄板传感器非线性弯曲控制方程.利用修正迭代法得到在机、电载荷共同作用下轴对称... 详细信息

为解决在作用电压和机械力的耦合载荷作用下具有压电元件圆薄板传感器的非线性弯曲问题,基于VonKarman薄板非线性理论和压电本构方程,导出具有压电元件圆薄板传感器非线性弯曲控制方程.利用修正迭代法得到在机、电载荷共同作用下轴对称圆薄板的载荷、挠度和电压的关系式.通过算例分别讨论机械载荷和作用电压的变化对圆薄板弯曲变形的影响,结果表明:通过改变压电元件作用电压的大小和方向,可以有效地控制圆板的曲变形.该成果对具有压电元件圆薄板传感器弯曲变形控制具有一定的理论指导意义.

关键词：非线性弯曲压电元件弹性圆薄板传感器修正迭代法载荷挠度电压

矩形脉冲作用下复合材料层合扁球壳的冲击屈曲分析

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固体力学学报 2006年第3期27卷 315-318页

作者：杨增涛徐加初暨南大学力学与土木工程系

研究了计及横向剪切的复合材料层合扁球壳在矩形脉冲载荷作用下的非线性动力屈曲问题;采用Galerkin方法得到以顶点挠度表达的动力响应方程,并用Runge-Kutta方法进行数值求解,应用Budiansky-Roth准则(简称B-R准则)确定冲击屈曲的临界荷载... 详细信息

研究了计及横向剪切的复合材料层合扁球壳在矩形脉冲载荷作用下的非线性动力屈曲问题;采用Galerkin方法得到以顶点挠度表达的动力响应方程,并用Runge-Kutta方法进行数值求解,应用Budiansky-Roth准则(简称B-R准则)确定冲击屈曲的临界荷载;讨论了壳体几何尺寸和物理参数对复合材料层合扁球壳冲击屈曲的影响;数值算例表明,该方法是可行的.

关键词：复合材料层合扁球壳矩形脉冲冲击屈曲