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含有分层损伤的复合材料加筋层合板的屈曲性态研究   总被引:8,自引:3,他引:5  
基于Mindin假定推导了考虑剪切的复合材料加筋层板的有限元列式,并在此基础上计算出筋间基板含嵌入分层以及筋与基板连接处含穿透分层的加筋层合板在受压缩载荷情况下的屈曲模式和临界力。本文所给出的有限元方法及结论对从事复合材料结构设计的工程人员具有参考价值。  相似文献
2.
受圆形表面单面约束的点锚固圆环热屈曲分析   总被引:1,自引:0,他引:1  
应用W.T.Koiter的初始后屈曲理论,研究了受圆形混凝土表面单面约束的点锚固圆环的热屈曲问题,根据混凝土容器壁的几何约束条件,假设了圆环的合理屈曲模状,得出了圆环在两锚固点之间发生屈曲的临界温度,并研究了其后屈曲性态和缺陷敏感性。结果表明,临界点和后屈曲路径的平衡均为稳定的,圆环对于与屈曲模态形状相同的缺陷是不敏感的。  相似文献
3.
We study experimentally the axial crushing behavior and crashworthiness characteristics of thin-walled steel tubes containing annular grooves. The grooves determine the positions of the folds and control the buckling mode of deformation. In the present work we aim to improve the uniformity of the load-displacement behavior and to predict the energy absorption capacity of the tubes. Grooves are cut circumferentially and alternately inside and outside the tubes at predetermined intervals. Quasi-static axial crushing tests are performed with different groove distances. Photographs are taken during axial buckling and the specimens after crushing are sectioned axially to carry out the measurements. The deformation modes and load-displacement curves are described and energy absorption and mean post-buckling load are determined. The convolutions are achieved by folding in an axisymmetric concertina mode about the circumferential grooves. The results show that the load-displacement curve and energy absorbed by the axial crushing of tubes can be controlled by the introduction of grooves with different distances.  相似文献
4.
ANANALYSISOFTHEPOST-BUCKLINGOFLAMINATEDPLATESOFSYMMETRICCROSS-PLYWengZongyi(翁宗诒)(ReceivedMarch6,1995,CommunicatedbyZhouChengt...  相似文献
5.
On the basis of von Kármán equations and using the general bifurcation theory,theelastic instability of an orthotropic elliptic plate whose edge is subjected to a uniform planecompression is discussed.Following the well-known Liapunov-Schmidt process theexistance of bifurcation solution at a simple eigenvalue is shown and the asymptoticexpression is obtained by means of the perturbation expansion with a small parameter.Finally,by using the finite element method,the critical loads of the plate are computed andthe post-buckling behavior is analysed.And also the effect of material and geometric parameters on the stability is studied.  相似文献
6.
On the basis of the first-order shear deformation plate theory and the zig-zag deformation assumption, an incremental finite element formulation for nonlinear buckling analysis of the composite sandwich plate is deduced and the temperature-dependent thermal and mechanical properties of composite is considered. A finite element method for thermal or thermo-mechanical coupling nonlinear buckling analysis of the composite sandwich plate with an interfacial crack damage between face and core is also developed. Numerical results and discussions concerning some typical examples show that the effects of the variation of the thermal and mechanical properties with temperature, external compressive loading, size of the damage zone and ply angle of the faces on the thermal buckling behavior are significant. Project supported by the National Natural Science Foundation of China (No. 59975013).  相似文献
7.
This paper deals with an analytical approach of the buckling behavior of a functionally graded circular cylindrical shell under axial pressure with external axial and circumferential stiffeners. The shell properties are assumed to vary continuously through the thickness direction. Fundamental relations and equilibrium and stability equations are derived using the third-order shear deformation theory. The resulting equations are employed to obtain the closed-form solution for the critical buckling loads. A simply supported boundary condition is considered for both edges of the shell. The comparison of the results of this study with those in the literature validates the present analysis. The effects of material composition (volume fraction exponent), of the number of stiffeners and of shell geometry parameters on the characteristics of the critical buckling load are described. The analytical results are compared and validated using the finite-element method. The results show that the inhomogeneity parameter, the geometry of the shell and the number of stiffeners considerably affect the critical buckling loads.  相似文献
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