基于ANSYS的天线杆屈曲分析

论文介绍了屈曲分析的定义和屈曲分析有限元分析法,采用有限元分析软件ANSYS建立了天线杆的有限元模型,然后对天线杆进行了线性屈曲分析和非线性屈曲分析,分别求出了屈曲模态及临界载荷,并将分析结果进行对比.对不同的初始缺陷的情况进行屈曲分析,得出临界载荷随初始缺陷的变化规律,分析结果为结构的优化设计提供了理论基础,对类似结构的屈曲分析提供了参考依据.     

基于ANSYS的角钢局部屈曲/后屈曲等效分析

将角钢等效成简单板材,通过分析其屈曲／后屈曲来等效研究角钢的局部屈曲／后屈曲．采用ANSYS严格按照角型材实际尺寸建立三维实体模型,并进行屈曲／后屈曲数值模拟．三维有限元解与理论等效结果符合良好,充分说明该等效分析的正确性和适用性．     

基于ANSYS Workbench的低温储罐多目标优化设计

为更加高效合理地设计质量更小的低温储罐,应用ANSYS Workbench中的Design Modeler模块建立某低温储罐外容器的有限元参数化模型,并对该设备进行特征值屈曲分析,得到其临界外压载荷。考察相关结构参数的影响,在此基础上利用多目标驱动优化分析得出在满足临界屈曲压力要求下的最优加强结构,实现设备的轻量化设计。     

铝合金受压板件局部屈曲承载力设计方法

为考察现有铝合金设计规范预测非焊接受压板件承载力的准确性,采用壳单元建立单向受压四边简支板、方形截面管柱和十字形截面轴压柱有限元模型,使用ANSYS计算得到铝合金板件弹塑性屈曲临界应力和极限承载力。数值计算结果与理论分析结果对比发现：现有板件弹塑性屈曲应力理论能够给出铝合金板件屈曲临界应力的下限值,误差较小。中国规范非加劲板件有效厚度预测公式偏保守,因此给出修正的有效厚度预测公式。修正后的非加劲板件有效厚度公式可以提高板件利用率,增强经济性。     

变截面压杆对应变式压杆压力传感器测量影响研究

用数值模拟的方法对应变式压杆压力传感器系统进行仿真,研究压杆的变截面对应变式压杆压力传感器测试结果的影响;数值模拟了不同上升前沿的梯形脉冲和三角形脉冲条件下变截面压杆的响应误差.与非变截面压杆相比,变截面压杆的应力波幅值和波形均发生了很大变化,无论梯形脉冲还是三角形脉冲,变截面压杆的应力波幅值都要降低.模拟结果对实验测试结果的分析有一定参考价值.     

基于微梁的面内高g值加速度计设计

提出了一种基于微梁的面内高g值加速度计的设计方案。根据材料力学中悬臂梁的相关理论,建立了微梁检测结构的等效模型,推导出了微梁应力和中间主梁应力的比值的表达式。通过改变结构的尺寸来调节比值,可以设计出更高量程和更高灵敏度的压阻式传感器。利用ANSYS软件对微梁和中间主梁的最大应力及电阻区应力进行了仿真分析,验证了设计方案的可行性。完成了一种量程可达15万gn的面内双轴高g值传感器的设计。     

基于 ANSYS 的某设备平台桥的仿真分析

附着式自爬升操作平台的平台桥为格构式受弯构件,是典型的空间桁架结构.针对结构的非线性屈曲的计算困难,为了获得平台桥的屈曲荷载优化结构设计,能获取准确安全载荷,采用结构有限元分析方法,并基于 ANSYS 软件对平台桥结构屈曲仿真分析,得到两种极端工况下的节点荷载一位移曲线,进而成功获得平台桥的屈曲形态及双重非线性屈曲荷载.仿真结果表明平台桥的双重非线性屈曲荷载相比结构的额定荷载较大,在额定荷载下平台桥安全可靠,为结构设计的稳定问题提供了可靠参考.     

CAE软件操作小百科(10)

1如何在ANSYS中实现梁与杆的铰接？在ANSYS中,梁单元有6个自由度（3个平动自由度和3个转动自由度）,而杆单元只有3个自由度（3个平动自由度）.梁与梁之间的默认连接方式为固接,即6个自由度完全耦合;而杆与杆之间的默认连接方式为铰接,即3个平动自由度完全耦合;梁与杆之间的默认连接方式也是铰接,即3个平动自由度完全耦合.因此,只需直接在节点上建立一个梁单元和一个杆单元即可实现梁与杆的铰接.     

倒指数形复合变幅杆的设计

提出一种新型的倒指数形复合变幅杆,通过增加输出端面的面积来改善变幅杆向液体等介质辐射能量的效率.首先构建了新型复合变幅杆的模型,得出其频率方程,用MATLAB解算出变幅杆的谐振长度,放大系数等重要参数,并借助于ANSYS软件对复合变幅杆进行模态分析和谐响应分析,最后得出的结果与理论设计基本一致.此研究对其它起匹配作用变...     

基于AWE的自行车车架的CAE分析

运用ANSYS Workbench集成开发平台对自行车车架进行了静力学和动力学及屈曲分析,用以指导车架的形状优化设计。首先,对自行车车架在AWE环境下Design Modeler模块中进行了三维建模;借助于这个模型,在AWE的Design Simulations模块中进行网格划分和约束载荷的施加;在此基础上并行的对车架进行应力应变分析、模态分析、屈曲分析,大大缩短了设计周期;最后整合这些分析结果,完成对车架的形状优化设计。     

Compressional stability behavior of composite plates with through-the-width and embedded delaminations by using first order shear deformation theory

In this paper, the compressive, i.e. bucking and post-buckling, behavior of composite laminates with through-the-width and embedded delaminations is investigated analytically. The analytical method is based on the first order shear deformation theory (FSDT) and its formulation is developed on the basis of the Rayleigh–Ritz approximation technique. In the case of the multiple delaminations, the contact phenomenon has significant effects on the compressional behavior of the laminates. Thus, the contact between the delaminated sublaminates is also considered in the presented FSDT analytical method. The method can handle both local buckling of the delaminated sublaminates and global buckling of the whole plate. Also, the three-dimensional finite element analysis is performed by using ANSYS5.4 general purpose commercial software, and the results are compared with those obtained by the analytical model. The agreement between the results is very good.     

Determination of residual stress in deep submicron thick films by the critical buckling technique of annular thin plates

Critical buckling of annular plates has been proposed to measure residual stress in thin films with submicron thickness and succeeds in measuring stress ranging from decades of MPa to hundreds of MPa. In this paper, critical buckling of annular plates was further researched in order to enhance their sensitivity, and improved structures were proposed to measure ultra small residual stress in scale of several MPa. Specimens of improved annular structures with thickness down to 200 nm were prepared on silicon-on-insulator wafer, and released in hydrofluoric HF solution to get the critical etching length under an on line monitoring system. The critical etching length was inputted into the ANSYS software to predict the residual stress by the eigenvalue buckling analysis. Small compressive stress of 3.07 MPa within 100 nm film was resolved successfully with this improved annular structure, but the micro rotating structures fabricated in the same die cannot generate a distinguishable deformation.     

板架结构复杂屈曲问题

利用Patran和MSC Nastran分析板的屈曲问题.明确利用有限元对板屈曲计算的方法,了解板架结构的长宽比和厚度对板架屈曲能力的影响程度.根据矩形板的中性平衡方程推导出板双轴向受压的临界压力公式,并利用有限元方法对其进行校核.     

Asymmetric buckling of bimodulus thick annular plates

An annular element with Lagrangian polynomials and trigonometric functions as shape functions is developed for asymmetric finite element stability analysis. The annular element is based on the Mindlin plate theory so that the effect of transverse shear deformation is included. Using the asymmetric finite element model, the asymmetric static buckling of bimodulus thick annular plates subjected to a combination of a pure bending stress and compressive normal stress is investigated. The obtained results of non-dimensional critical buckling coefficients are shown to be very accurate when compared with the exact solutions. The effects of various parameters on the buckling coefficients are studied. The bimodulus properties are shown to have significant influences on the buckling coefficients.     

Buckling of cylindrical panels under axial compression

This paper investigates the effects of boundary conditions and panel width on the axially compressive buckling behavior of unstiffened, isotropic, circular cylindrical panels. Numerical results are presented for eight different sets of boundary conditions along the straight edges of the panels. For all sets of boundary conditions except one (SSI), the results show that the panel buckling loads monotonically approach the complete cylinder buckling load from above as the panel width is increased. Low buckling loads, sometimes less than half the complete cylinder buckling load, are found for simply supported panels with free in-plane edge displacements (SSI). The SSI buckling loads are below the complete cylinder load even for ‘360° panels’. It is also observed that the prevention of circumferential edge displacement is the most important in-plane boundary condition from the point of view of increasing the buckling load, and that the prevention of edge rotation (i.e. clamping) in the circumferential direction also significantly increases the buckling load. Parametric studies are also performed to determine the effects of variations in panel length and thickness on the buckling loads.     

履带车辆扭杆弹簧有限元模型与优化

扭杆弹簧是车辆悬挂(架)装置中常用的弹性元件。该文利用有限元方法对扭杆弹簧进行了建模，给出了扭杆弹簧的结构应力分布规律，在此基础上，对原结构存在的问题，提出了改进方案并进行了有限元的优化计算分析。分析结果表明，所提出的改进结构优于原结构，其研究结果对扭杆弹簧的优化设计具有指导意义。     

Probabilistic buckling analysis of fiber metal laminates under shear loading condition

The design allowables for compressive and shear buckling of fiber metal laminate (FML) panels need to be developed for the certification of these materials. In this paper, the shear buckling behavior of the two FML panels, ARALL3-3/2 and GLARE3-2/1, is investigated using a probabilistic analysis method in order to predict the distributions of the buckling load. The scatter associated with the material properties and the randomness in the loading conditions are accounted for in the probabilistic analysis. The shear buckling load of the panel is taken as the response function of the material properties and the load parameter. The response surface methodology (RSM) is employed for the development of the response function based on limited finite element data. Three RSM design methods: full factorial design, CCD design and saturated D-optimum design, are applied to construct the response function following which the shear buckling load distributions of the two FML panels are predicted. The predicted results are verified using independently generated finite element data.