轴心受压碳纤维管有限元数值研究

发布时间：2018-07-06 21:04

本文选题：碳纤维复合材料管 + 初始缺陷分析　；参考：《南京理工大学》2015年硕士论文

【摘要】：本文以新型索穹顶结构中的轴压碳纤维复合材料管为研究对象,对碳纤维复合材料管的轴压稳定问题进行了有限元数值分析。根据相关文献的实验结果,采用轴心受压碳纤维管的有限元模型进行初始缺陷分析,得出对于长管整体失稳,可以取管长的1/160作为等效初弯曲来描述长管整体失稳时的初始缺陷；对于短管局部失稳,其初始缺陷为管壁厚的5/12～5/9。研究了铺层角度和长细比对轴压碳纤维复合材料管承载力的影响。当采用[00]n铺设方式时,管的轴压承载力最大；当在铺层中增加少量900铺层时,管的承载力会稍微降低,但管的延性会大大增加。轴压碳纤维管的承载力会随长细比的增大而降低,管的延性随长细比的增大而增大。最后研究了弹性支撑刚度对轴压碳纤维复合材料管承载力的影响。对于有侧移弹性支撑CFRP轴心受压管,其承载力随着侧向弹簧刚度的增大表现出先波动后稳定的趋势；对于有侧移和无侧移弹性支撑CFRP轴心受压管,当顶底部弹簧铰刚度不断增大时,稳定承载力不断增大,而轴心受压CFRP管的延性不断减小。在实际应用时,应取较大的侧向弹簧刚度使轴心受压CFRP管处于无侧移弹性支座边界条件。为了能够既提高承载力又不致过多的降低CFRP管的延性,必须保证顶部与底部的弹簧铰刚度和顶底部弹簧铰刚度比处在一个适当的范围内。
[Abstract]:In this paper, the axial compression CFRP tube in a new cable-dome structure is taken as the research object, and the finite element numerical analysis of the axial compression stability of CFRP tube is carried out. According to the experimental results of related literature, the finite element model of axially compressed carbon fiber tube is used to analyze the initial defects, and the overall instability of long tube is obtained. 1 / 160 of the length of the tube can be taken as the equivalent initial bending to describe the initial defect in the whole instability of the long tube, and for the local instability of the short tube, the initial defect is 5 / 12 / 5 / 9 of the wall thickness of the pipe. The effect of laying angle and aspect ratio on the bearing capacity of axially compressed carbon fiber composite tubes was studied. When using the [00] n laying mode, the axial compression capacity of the pipe is the largest, and the ductility of the pipe will be greatly increased when a small amount of 900 layers are added to the layer. The bearing capacity of the pipe will be slightly reduced, but the ductility of the pipe will be greatly increased. The bearing capacity of axially compressed carbon fiber tube decreases with the increase of the aspect ratio, and the ductility of the tube increases with the increase of the slenderness ratio. Finally, the effect of elastic bracing stiffness on the bearing capacity of axially compressed carbon fiber composite tubes is studied. For axially compressed CFRP tube with lateral elastic support, its bearing capacity fluctuates first and then stabilizes with the increase of lateral spring stiffness. When the stiffness of the spring hinge at the top bottom increases, the steady bearing capacity increases and the ductility of the axially compressed CFRP tube decreases. In practical application, the lateral spring stiffness should be taken to make the axially compressed CFRP tube at the boundary condition of non-lateral elastic support. In order to improve the bearing capacity and not reduce the ductility of CFRP tube, it is necessary to ensure that the ratio of spring hinge stiffness to bottom spring hinge stiffness is in an appropriate range.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU399

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