复合材料补片加固含椭圆孔钢板刚度分析

针对复合材料补片加固损伤钢板的受力特点, 建立三维弹性力学模型, 对复合材料补片双面加固轴向受拉平板进行了应力和变形分析。研究了粘贴界面的剪应力分布规律, 钢板和补片内轴向拉力的分布规律, 分析了加固后平板相对加固前的相对刚度。研究了含椭圆孔钢板经复合材料补片加固后相对加固前以及相对完好钢板的刚度。结果表明, 复合材料胶接修补含孔钢板的刚度随着补片厚度的增加而增加, 且增强的趋势逐渐趋于缓和。当补片层数大于5层后, 单纯依靠增加补片的厚度并不能有效提高修复效果。解析法与有限元法的计算结果及试验结果吻合得比较好。 

Stiffness analysis of steel plate with a elliptical cutout reinforced by bonded composite patch

Based on the features of damaged steel plates bonded by composite patch, a three demensional mechanical modeling of elasticity was presented in this paper. The stresses and deformation of axially stretched flat double-side bonded by composite patch were investigated. The distribution of the shear stresses within the bondline and the distribution of the axial force in the steel plate and the patch were studied. The relative stiffness of the reinforced plate versus intact plate was determined. And the relative stiffness of steel plate with a elliptical cutout after versus before reinforced by bonded composite patches and versus intact plate were evaluated. The results indicate that the stiffness of the steel plate with a circular cutout reinforced by bonded composite patches increases with the increase of thickness of the composite patch, and the amount of increasing gradually mitigates. The rehabilitation efficiency can not be effectively improved depending on increasing the thinckness of the patch alone, as more than 5 layers. The present results have validated the finite element predictions and test results.