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With the ordinary boundary conditions, the numerical solution was presented for the problem of axisymmetric buckling.

得到形式上简化了的屈曲控制方程。在比较简单的边界条件下,进行了轴对称屈曲问题的数值求解。

Be based on more accurate wedge thin wall component is inflectional and academic, the crankle of the wedge bridge that linear to bearing change carries curved rules effect is inflectional undertook a large number of analysises, put forward new wedge I-steel computation of curved rules of Liang Lin group is formulary.

基于较精确的楔形薄壁构件屈曲理论,对承受线性变化端弯矩功能的楔形梁的弯扭屈曲进行了大量分析,并提出了新的楔形工字钢梁临界弯矩计算公式。

The nonlinear dynamic equations including the initial geometric imperfections of laminated composite cylindrical shells were derived from Hamilton's philosophy. Assuming the transverse displacements to be composed of axially symmetrical part and axially asymmetrical part, the governing equations expressed as displacement forms of dynamic buckling were obtained by Galerkin method. The equations were solved by finite difference method. The effects of impact velocity, lamination angle, initial geometric imperfection on the axial dynamic buckling of laminated composite cylindrical shells were discussed.

由Hamilton原理导出包含初始几何缺陷的复合材料层合圆柱壳的非线性动力方程;将横向位移设为对称及非对称两部分,由Galerkin方法得到以位移形式表达的动力屈曲控制方程,通过有限差分方法求解;讨论了冲击速度、铺层角度、初始几何缺陷等各种因素对复合材料圆柱壳轴向冲击动力屈曲可能产生的影响。

This thesis contains three parts: The first part focused on the simulation of the dynamic buckling for rod impacted by dynamic force and rigid body in axial direction, which is hinge joint and uniform cross section, basing on the ANSYS/LS-DYNA and PAMCRASH.

本文的研究工作主要有三部分组成:第一部分基于有限元程序ANSYS/LS-DYNA、PAMCRASH分别对两端铰接、等截面直杆在轴向动力载荷作用下的屈曲和刚性块轴向冲击作用下直杆的动力屈曲过程进行了数值模拟和分析。

The results show that the aluminum alloy sandwich deck under lateral pedrail deck load and wheel load would fail in the form of compression buckling.

研究表明,铝合金夹心板在横向履带载和轮式载的作用下,主要表现为受压面板的屈曲和夹心斜撑板的屈曲。

By using Galerkin's method the partial differential equation is reduced ordinary differential equation with quadratic nonlinearity. The results of qualitative analysis indicate that the system has homoclinic orbit.

定性分析表明,对于前屈曲和后屈曲两种情况,系统的相图具有相同的同宿轨道,只是位置在相平面上沿横轴发生了一个简单的平移。

AIM To investigate the surgical treatments on ankylosed hip joints with flexion informity, 11 cases of total hip arthroplasty course and postoperative treatment were analysed retrospectively.

目的 通过回顾性分析髋关节屈曲强直后的治疗经过,对髋关节屈曲强直后的人工全髋关节置换术的外科治疗方法进行探讨。

Elastic buckling and inelastic buckling of arch with and without out-of-plane brace under full span distributed load and concentrated load are investigated The effects of the brace to the out-of-plane buckling load of arch are studied.

对拱结构在全跨均布荷载和跨中集中荷载作用下的平面外屈曲性能进行了研究,其中考虑了屈曲前变形路径的影响和面外支撑情况,为工程设计提供了有参考价值的建议。

Based on this theory we deduce related equations of expansion force in plate and build elements of plate and magnetic field. After the analysis of magnetic field by FEM and some numerical computation we get the critical value of magnetic field when plate buckles.

在实现了用有限元对磁场进行三维分析基础之上,基于磁致应变假定,推导出相应等效载荷的计算公式,完成了恒定磁场作用下磁弹性矩形薄板的屈曲分析,求得了板屈曲时的磁场临界值。

The theoretical and experimental research on the elasto-plastic buckling strength of the web with longitudinal stiffener in I-section steel girder under pure bending was made using energy method and the influence of stiffness of longitudinal stiffener on buckling coefficient of the girder web was analyzed.

对工字钢梁腹板在纯弯作用下的弹塑性屈曲承载能力进行了理论计算和试验研究,并进行了对比分析,着重研究了纵向加劲肋刚度对腹板屈曲系数的影响-对现行《钢结构设计规范》(GBJ17- 88)的有关条款进行了讨论

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