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Effect of nanocomposites on the dynamic properties of repaired flexural elements

机译：纳米复合材料对修复弯曲元件动力学特性的影响

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摘要

Application of modern techniques to rehabilitate structural elements due to aging and/or flexural cracks is of great concern by many researchers. In the current research, high strength epoxy matrix incorporated Carbon Nano Tubes (CNT) was used to bridge up the gaps in the vicinity of flexural cracks. First, the physical properties of CNT were studied followed by mechanical examination of the epoxy resin with/without CNT. The dynamic behavior of simply supported concrete and steel beams, as well as a cantilever steel beam was investigated. All the examined beams were excited by a light impact hummer at their sound, cracked, and repaired states. The free vibration response was collected, processed and the modal parameters were obtained. The change in the dominant natural frequency and damping ratio were investigated in each of the examined condition. The degradation in the beams was created by generating synthetic cracks at the locations of maximum bending moment using a saw cut. Furthermore, intensive numerical finite element modelling (FEM) was carried out using (ANSYS). The obtained numerical results were of great coincidence to the experimental work. It was concluded that the use of epoxy matrix containing CNT enhanced the dynamic properties of the cracked beams and was able to restore the integrity of the beams to a condition slightly the same as their original sound states.
机译：应用现代技术修复由于老化和/或挠曲裂缝引起的结构元件是许多研究人员非常关注的问题。在当前的研究中，结合了碳纳米管（CNT）的高强度环氧基质被用来弥合弯曲裂纹附近的间隙。首先，研究CNT的物理性能，然后对有/无CNT的环氧树脂进行机械检查。研究了简支混凝土和钢梁以及悬臂钢梁的动力特性。所有被检查的光束在声音，破裂和修复状态下都受到轻微的嗡嗡声激发。收集自由振动响应，进行处理并获得模态参数。在每种检查条件下，都研究了主导固有频率和阻尼比的变化。梁的退化是通过使用锯切在最大弯矩位置处产生合成裂纹而造成的。此外，使用（ANSYS）进行了密集的数值有限元建模（FEM）。所得数值结果与实验工作非常吻合。结论是，使用含有CNT的环氧基质可增强裂化梁的动态性能，并能够将梁的完整性恢复到与原始声态略微相同的状态。

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