Salahuddin Bidita, Mutlu Rahim, Baigh Tajwar A, Alghamdi Mohammed N, Aziz Shazed
ARC Centre of Excellence for Electromaterials Science and Intelligent Polymer Research Institute, University of Wollongong, Innovation Campus, Squires Way, North Wollongong, NSW 2522, Australia.
School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, NSW 2522, Australia.
Polymers (Basel). 2021 Apr 11;13(8):1235. doi: 10.3390/polym13081235.
Passive vibration control using polymer composites has been extensively investigated by the engineering community. In this paper, a new kind of vibration dampening polymer composite was developed where oriented nylon 6 fibres were used as the reinforcement, and 3D printed unoriented nylon 6 was used as the matrix material. The shape of the reinforcing fibres was modified to a coiled structure which transformed the fibres into a smart thermoresponsive actuator. This novel self-reinforced composite was of high mechanical robustness and its efficacy was demonstrated as an active dampening system for oscillatory vibration of a heated vibrating system. The blocking force generated within the reinforcing coiled actuator was responsible for dissipating vibration energy and increase the magnitude of the damping factor compared to samples made of non-reinforced nylon 6. Further study shows that the appropriate annealing of coiled actuators provides an enhanced dampening capability to the composite structure. The extent of crystallinity of the reinforcing actuators is found to directly influence the vibration dampening capacity.
工程界已对使用聚合物复合材料的被动振动控制进行了广泛研究。在本文中，开发了一种新型的减振聚合物复合材料，其中取向尼龙6纤维用作增强材料，3D打印的无取向尼龙6用作基体材料。增强纤维的形状被修改为螺旋结构，从而将纤维转变为智能热响应致动器。这种新型的自增强复合材料具有很高的机械强度，并且其作为加热振动系统振荡振动的主动减振系统的功效得到了证明。与由非增强尼龙6制成的样品相比，增强螺旋致动器内产生的阻塞力负责耗散振动能量并增加阻尼因子的大小。进一步的研究表明，对螺旋致动器进行适当的退火处理可提高复合结构的减振能力。发现增强致动器的结晶度直接影响减振能力。
