混合状态Hamiltonian元的半解析解和叠层板的计算

本文给出混合状态方程的一种强有力的半离散半解析解法,并给出了矩形域和叠层板的算例,讨论了可能的发展和应用。     

波纹钢屋盖结构板件相关屈曲的试验研究与分析

拱型波纹钢屋盖结构的受力机理异常复杂，波纹、加工制作过程中产生的变形和残余应力等初始缺陷在理论分析中很难精确定量描述。论文对波纹钢屋盖结构梯形截面板组进行了轴心和偏心压力作用下稳定承载能力的试验研究，并与理论结果进行了比较分析，试验与理论结果吻合较好。试验结果表明波纹板组具有较高的局部屈曲承载能力，但几乎无屈曲后承栽能力，与平板板组屈曲特性相比有显著差异。     

多层金属爆炸焊接复板飞行姿态的计算方法

在两层金属爆炸焊接复板飞行姿态的理论计算基础上，运用质量守恒、动量守恒定理和契特公式推导了多层金属爆炸接复板飞行姿态的理论计算模型，经过实验验证，该计算模型和实验相符合，对于多层金属爆炸焊接工艺参数的设计具有很高的使用价值。     

导流板对腔口液体自持振荡影响的研究

腔口流体动力自持振荡的频率和导流板的长度有一定关系。本文通过对跨越腔口非稳定层和自持振荡物理论分析，并通过对不同长导流板的腔、低速流激自持振荡均方压力谱分析和实验研究，给出流自持振荡的频率与导流板长度之间的关系。     

FREE VIBRATION OF ANISOTROPIC RECTANGULAR PLATES BY GENERAL ANALYTICAL METHOD

According to the differential equation for transverse displacement function of anisotropic rectangular thin plates in free vibration, a general analytical solution is established. This general solution, composed of the composite solutions of trigonometric function and hyperbolic function, can satisfy the problem of arbitrary boundary conditions along four edges. The algebraic polynomial with double sine series solutions can also satisfy the problem of boundary conditions at four corners. Consequently, this general solution can be used to solve the vibration problem of anisotropic rectangular plates with arbitrary boundaries accurately. The integral constants can be determined by boundary conditions of four edges and four corners. Each natural frequency and vibration mode can be solved by the determinate of coefficient matrix from the homogeneous linear algebraic equations equal to zero. For example, a composite symmetric angle ply laminated plate with four edges clamped has been calculated and discussed.     

爆炸荷载下矩形板的塑性动力响应

本文采用Jones-Sawczuk控制方程,导出了脉冲荷载下矩形板最大残余挠度的简单理论计算公式,并应用该公式和动态屈服条件,计算了固支方板在爆炸荷载下的最大残余挠度值,与试验结果比较,取得了令人满意的结果。     

板锥网壳结构几何非线性受力性能的广义协调元分析

板锥网壳网络是一种新型的空间结构，它是在板锥单元和常规的双层刚壳结构的基础上组合形成的一种新型结构形式，具有良好的技术经济效益和建筑视觉效果。本文在对这类结构有限法分析的基础上，根据板锥网壳结构的构成特点，应用广义协调元的基本思想，对这类结构进行了分析，给出了这类结构广义协调元分析的基本公式。分析表明：广义协调元法适宜于板锥网壳结构的受力性能分析，广义协调元固有的简便，高效和可靠的特性，将会使结构分析得到更为可信和可靠的论证。     

正交各向异性压磁电弹性矩形板的稳定问题

从压磁电弹性力学的三维平衡方程和本构关系出发,推导得到了正交各向异性压磁电弹性矩形板稳定问题的状态方程。求解状态方程并结合边界条件得到了稳定问题的屈曲方程。给出了临界应力的算例。     

割口单向叠层板的拉伸应力集中与强度

基于剪滞理论,建立一种分层剪滞模型,分析了含割口的单向叠层板在拉伸载荷作用下的应力重新分布问题,获得了割口前缘完整纤维的应力集中因子.在此基础上,采用细观统计破坏理论,研究了割口单向叠层板的拉伸破坏强度,得到了与现有实验较吻合的结果.     

ANALYTICAL EVALUATION OF PERMANENT DEFLECTION OF A THIN CIRCULAR PLATE STRUCK NORMALLY AT ITS CENTER BY A PROJECTILE

The permanent deflection of a thin circular plate struck normally at its center by a projectile is studied by an approximate theoretical analysis,FEM simulation and experiment.The plate made of rate sensitive and strain-hardening material undergoes serious local deformation but is not perforated during the impact.The theoretical analysis is based on an energy approach, in which the Cowper-Symonds equation is used for the consideration of strain rate sensitive effects and the parameters involved are determined with the aid of experimental data.The maximum permanent deflections predicted by the theoretical model are compared with those of FEM sim- ulation and published papers obtained both by theory and experiment,and good agreement is achieved for a wide range of thickness of the plates and initial impact velocities.