应用微分方法确定复合泡沫塑料的杨氏模量

通过微分方法研究了复合泡沫塑料的有效模性质，结果表明；这一方法可预测较高空心球体积含量复合的模量，对其结果进行修正后，可正确预测复合泡沫塑料的杨氏模量，预测民实验结果相当一致。     

高变形率低密度碳／碳复合材料的研究

介绍了一种平均压缩率达到１０％，平均压缩回弹率达到１３％的低密度碳／碳材料及其独特的制造技术，对改善碳／碳材料的韧性提供了一种行之有效的方法。其主要工艺途径为，在水中以表面活性剂分散、包覆原材料、混合抽滤、烘干固化、炭化等工序。     

纤维缠绕体连接结构设计计算

给出了固体箭发动机纤维缠绕体接头，堵盖，连接螺栓，金属裙和密封结构等的设计计算方法，经实验验证和多种壳体设计应用，证明是行之有效的。     

复合材料脱层屈曲的摄动解

用摄动法求解了３Ｄ复合材料中有纤维搭桥的圆形脱层的屈曲问题。搭桥纤维被视为连续分布于脱层屈曲上的线性弹簧，给出了脱层屈曲介载荷，挠度曲线与脱层半径、塔桥因子等的封闭关系式。根据支夹支－边界条件以及脱层只能向一个方向挠曲的约束条件，导出了一个特征长度α＾３，当脱导出α＾＊时，支屈曲时将发生靠近边界区域的接触现象，当脱导 地α＾＊时，地 曲将跨越整个支区域，并随着半径的减小，脱层屈曲的临界载荷将逐渐提     

民用飞机复合材料C型框分析方法研究

以层压板理论为基础,提出一种复合材料C型框结构的工程分析方法,并通过试验给出了C型框结构设计许用值。通过工程分析结果与试验结果的对比,说明此工程分析方法可用于指导C型框结构设计。     

Cylindrical and spherical dust-electron-acoustic shock waves due to dust charge fluctuation

Cylindrical and spherical dust-electron-acoustic (DEA) shock waves propagating in a dusty plasma (containing cold inertial electrons, hot Maxwellian electrons, stationary and streaming ions, and charge fluctuating stationary dust) are theoretically investigated by reductive perturbation method. It is shown that the effect of the dust charge fluctuation introduces some new features in the nonlinear propagation of the DEA waves, particularly the dust charge fluctuation provides a source of dissipation, and is responsible for the formation of the DEA shock structures. It is also found that the basic features of the DEA nonlinear structures are significantly modified by the non-planar (viz. cylindrical and spherical) geometry, and that the height of the cylindrical DEA shock structures are larger than that of the planar DEA shock structures, but smaller than that of the spherical ones. The implications of these results in laboratory dusty plasmas are briefly discussed.     

Tearing,coalescence and fragmentation processes in solar flare current sheet and drifting pulsating structures

The paper presents a summary of results from two different simulations which study the tearing, coalescence and fragmentation of current sheets, the associated production of energetic electrons and of plasma waves from these electrons which could explain drifting pulsation structures observed at radio wavelengths. Using a 2.5-D particle-in-cell (PIC) model of the current sheet it is shown that due to the tearing mode instability the current sheet tears into plasmoids and these plasmoids later on coalesce into larger ones. During these processes electrons are accelerated and they produce observable electromagnetic waves. Furthermore, the 3-D PIC model with two current sheets extended in the electric current direction shows their fast fragmentation associated with the exponential dissipation of the free magnetic field energy. An example of the drifting pulsating structure which is considered to be a radio signature of the above mentioned processes in solar flares is shown.     

Shear flow energy redistribution stipulated by the internal-gravity wavy structures in the dissipative ionosphere

The linear mechanism of generation, intensification and further nonlinear dynamics of internal gravity waves (IGW) in stably stratified dissipative ionosphere with non-uniform zonal wind (shear flow) is studied. In case of the shear flows the operators of linear problem are non-selfadjoint, and the corresponding Eigen functions – nonorthogonal. Thus, canonical – modal approach is of less use studying such motions. Non-modal mathematical analysis becomes more adequate for such problems. On the basis of non-modal approach, the equations of dynamics and the energy transfer of IGW disturbances in the ionosphere with a shear flow is obtained. Exact analytical solutions of the linear as well as the nonlinear dynamic equations of the problem are built. The increment of shear instability of IGW is defined. It is revealed that the transient amplification of IGW disturbances due time does not flow exponentially, but in algebraic – power law manner. The effectiveness of the linear amplification mechanism of IGW at interaction with non-uniform zonal wind is analyzed. It is shown that at initial linear stage of evolution IGW effectively temporarily draws energy from the shear flow significantly increasing (by an order of magnitude) own amplitude and energy. With amplitude growth the nonlinear mechanism turns on and the process ends with self-organization of nonlinear solitary, strongly localized IGW vortex structures (the monopole vortex, the transverse vortex chain or the longitudinal vortex street). Accumulation of these vortices in the ionospheric medium can create the strongly turbulent state.     

铜铬复合电极电火花小孔加工机理及试验研究

电火花小孔加工中存在工具电极损耗严重、加工速度慢、棱角变钝出现锥度等问题。分析其存在问题的原因,提出采用铜铬复合电极进行电火花小孔加工。分析其加工机理并进行实验,实验结果表明:采用铜铬复合电极进行小孔加工比采用铜电极进行小孔加工能显著提高加工速度,减小锥度和电极相对损耗。