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The scheme of gasabrasive wear test of turbine compressor blades under free vibration of blades, including at high temperatures, is proposed.


Investigation of Fatigue Damage of 20Kh13 Structural Steel and its Compositions with Fused Coatings by the Free Vibration Method


It is shown that the dynamics of variation of the free vibration frequency of the samples is tightly related to the kinetics of fatigue damage.


Results of an analysis of the possibilities of diagnostics of fatigue damage of pieces from metallic materials and compositions with coatings obtained with the use of the free vibration method are given.


The perturbation can be proportional to any of the free vibration modes.

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 The extent of application of the classical laminated plate vibration theory and laminated plate vibration theory with consideration of shear deformation is examined by means of the accurate solutions for the free vibration of simply supported and arbitrarily crossply laminated rectangular plates.In the classical laminated plate vibration theory, the influence of the inertia forces in two directions in the plane of the plate is also studied. We came to the conclusion that this influence can be neglected.... The extent of application of the classical laminated plate vibration theory and laminated plate vibration theory with consideration of shear deformation is examined by means of the accurate solutions for the free vibration of simply supported and arbitrarily crossply laminated rectangular plates.In the classical laminated plate vibration theory, the influence of the inertia forces in two directions in the plane of the plate is also studied. We came to the conclusion that this influence can be neglected.  本文用任意正交铺层的简支矩形板自由振动问题的精确解,通过计算研究了经典层板和考虑剪切的层板振动理论的适用范围;还研究了在经典层板横向振动理论中板平面内两个方向惯性力的影响问题,结论是可以忽略这种影响。  On the basis of classical laminated tbeory, by using halffinite element method, analysis of static, stabilizing and linear free vibration for laminated composite thin wall shells of revolution is done in this paper. Examples are computed and compared with other references. The numerical results obtained are satisfactory.  本文在经典层合板理论基础上,利用半有限元法,对叠层复合材料旋转薄壳进行了静力,稳定和自由振动分析。最后,编程计算了一些例题,并和有关文献进行了比较,其数值结果较好。  One of the most important characteristics of symmetric angleply laminates is that there exist two terms, D_(16) and D_(26), of bending twisting coupling, that makes it almost impossible to obtain, by using traditional series expansion method, the exact solution. In this present paper, the twostep expansion (TSE) technique, proposed recently by the first author, is employed to give a general solution for bending, buckling and vibration of symmetric angleply rectangular laminates. The basic idea of TSE is... One of the most important characteristics of symmetric angleply laminates is that there exist two terms, D_(16) and D_(26), of bending twisting coupling, that makes it almost impossible to obtain, by using traditional series expansion method, the exact solution. In this present paper, the twostep expansion (TSE) technique, proposed recently by the first author, is employed to give a general solution for bending, buckling and vibration of symmetric angleply rectangular laminates. The basic idea of TSE is that: (1) let where X_m(x) and Y_n(y) are chosen in such a way that they satisfy part of the boundary conditions, i.e., displacement boundary conditions. C_(mn) is constants to be determined later; (2) The bending moment derived from W can be rewritten in terms of newly selected series of base functions which are orthogonal, complete and also satisfy the remain boundary conditions. Substituting bending moments into the governing equations, one may obtain C_(mn). For buckling and vibration problems, slight modification is needed to obtain C_(mn) and critical buckling load, or frequencies of laminates. Special attension is focused on the exact solutions of bending, buckling and vibration of symmetric angleply rectangular lamin ates with four sides simply supported in the present paper. Numerical results are given for bending of laminates under uniform load, free vibration and buckling of rectangular lamintes with two opposite sides subjected to uniformly distributed inplane compressive load. And from the numerical analyses, it might be concluded that: (1)Increase of D_(16) and D_(26) results in enlargement of the deflection and decrease of both the fundamental frequency and the critical buckling load; (2) Variation of D_(16) and D_(26) may significantly influence the buckling mode. They may increase or decrease the halfwave number of the buckling mode for certain cases; (3) D_(16) and D_(26) may have influence on the vibration mode to certain extent, but less severely than on the buckling mode.  本文采用文献中的两步级数展开法,分析了四边简支对称角交铺设叠层板的弯曲、稳定与振动问题。文中给出了板受均布力作用的弯曲问题、振动问题以及只有二对边受均匀压力N_x的稳定问题的数值结果、并且讨论了弯曲扭转耦合刚度D_(16)和D_(26)对挠度、临界荷载、基频以及与之对应的失稳波形和振型的影响。   << 更多相关文摘 
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