Pole , thin plate , thin shell in the electromagnetic elastic system , etc . when there is no machinery to restrain , the system has an unstable movement mode at least , and while exists restrain , after up to a certain critical value in electric current or the magnetic fielding , buckling must take place in the system 电磁弹性系统中的杆、薄板、薄壳等，当没有机械约束时，系统至少存在一个不稳定的运动模态，而存在约束时，当电流或磁场达到某一临界值后，系统将发生屈曲。
As regards to the spheric thin shell structure under external hydro static pressure , basing on flat - plate theory and by using basic von karman equations for large deflection , the equilibrium problem of axisymmetric bending of the spheric shell under uniform external pressure is simplified to an equilibrium problem of bending of elastic basic flat - plate and further converted into an equilibrium problem of beam on elastic fundation taking into consideration of the deformation characteristics 对球形薄壳结构随静水外压的情况，应用平板理论中的vonkarman大挠度基本方程，将球形薄壳在均匀外压下的轴对称弯曲平衡问题简化为弹性基础平板的弯曲平衡问题，进而再根据变形特点将其转化为弹性基础梁的复杂弯曲平衡问题。
The mathematic model of the ultra - thin spherical mirror is to be treated as elastic thin shell . then the predigested model , i . e . , bended beam , used in qualitative analysis was proposed , and its deflection and stress formulas under the freely supported condition were set up . based on an off - axis aspherical primary mirror , the relationship of aspherical surface error ( rms ) in tangential plane with bended beam ’ s radius r , position s of concentrated load p and geometry length l of arc was analyzed 根据这一设想,本文建立了超薄镜的数学模型?薄壳,并提出了强制力作用下超薄镜的简化模型?曲梁,推导了曲梁在简支情况下受力变形的挠度公式,并结合一个实例,计算出曲梁变形后与所需非球面的面形残差( rms )在子午方向与曲梁弧长l 、曲梁半径r及集中力位置s的关系及满足面形精度的r和s范围,分析了弧矢方向的rms ,得出了同时满足子午和弧矢方向面形要求的l 、 r和p 。
Abstract : in this paper , it analyzes the main influencing factors of plasma spraying forming and experimentally studies the structure and quality of plasma spraying coats . the mould manufacturing by plasma spraying and the parts made by the mould are obtained . and the thin shell parts produced are also obtained by plasma spraying 文摘:分析了影响等离子喷涂成形的主要因素，试验研究了等离子喷涂层的结构和质量，给出了等离子喷涂成形的模具和用该模具制作的零件以及等离子喷涂成形的薄壁零件。
However , some basic but crucial problems still remain unsettled : in the aspect of plate bending element , there exists the problem of imbalance between the development of plane elasticity elements and that of plate bending elements , which is not compatible with the similarity theory between plane elasticity and plate bending , for according to the theory the two systems , plane elasticity and plate bending , are isomorphic ; in the aspect of thin shell element , the ultimate aim is to construct the shell element which can perform well in both membrane - dominated and bending - dominated situations , yet so far no widely accepted guiding theory or practicable method has been found 但是，仍然存在一些基本而又不容忽视的问题有待研究解决。在板弯曲单元方面，不可否认的是板单元与平面弹性单元这两个研究领域的发展并不均衡，这一现状是与平面弹性和板弯曲的相似性理论不相协调的，因为该相似性理论表明平面弹性和板弯曲这两个理论体系是同构的。在薄壳单元方面，根本目标是构造在膜变形和弯曲变形分别占主导的壳体考题中都有良好表现的壳单元，但至今没有非常明确的指导理论和实施方案。
In this paper , it analyzes the main influencing factors of plasma spraying forming and experimentally studies the structure and quality of plasma spraying coats . the mould manufacturing by plasma spraying and the parts made by the mould are obtained . and the thin shell parts produced are also obtained by plasma spraying 分析了影响等离子喷涂成形的主要因素，试验研究了等离子喷涂层的结构和质量，给出了等离子喷涂成形的模具和用该模具制作的零件以及等离子喷涂成形的薄壁零件。
