He Feiyang, Ning Haoran, Khan Muhammad
Centre for Life-Cycle Engineering and Management, Cranfield University, Cranfield MK43 0AL, UK.
School of Aerospace, Transport and Manufacturing, Cranfield University, Cranfield MK43 0AL, UK.
Polymers (Basel). 2023 Jan 4;15(2):257. doi: 10.3390/polym15020257.
The present paper aims to investigate the process parameters and damping behaviour of the acrylonitrile butadiene styrene (ABS) cantilever beam manufactured using material extrusion (MEX). The research outcome could guide the manufacture of MEX structures to suit specific operating scenarios such as energy absorption and artificially controlled vibration responses. Our research used an experimental approach to examine the interdependencies between process parameters (nozzle size, infill density and pattern) and the damping behaviour (first-order modal damping ratio and loss factor). The impact test was carried out to obtain the damping ratio from the accelerometer. A dynamic mechanical analysis was performed for the loss factor measurement. The paper used statistical analysis to reveal significant dependencies between the process parameters and the damping behaviour. The regression models were also utilised to evaluate the mentioned statistical findings. The multiple third-order polynomials were developed to represent the relation between process parameters and modal damping ratio using stiffness as the mediation variable. The obtained results showed that the infill density affected the damping behaviour significantly. Higher infill density yielded a lower damping ratio. Nozzle size also showed a notable effect on damping. A high damping ratio was observed at a significantly low value of nozzle size. The results were confirmed using the theoretical analysis based on the underlying causes due to porosity in the MEX structure.
本文旨在研究采用材料挤出（MEX）工艺制造的丙烯腈-丁二烯-苯乙烯（ABS）悬臂梁的工艺参数和阻尼行为。研究结果可为制造适用于特定运行场景（如能量吸收和人工控制振动响应）的MEX结构提供指导。我们的研究采用实验方法来研究工艺参数（喷嘴尺寸、填充密度和图案）与阻尼行为（一阶模态阻尼比和损耗因子）之间的相互依存关系。通过冲击试验从加速度计获取阻尼比。进行动态力学分析以测量损耗因子。本文采用统计分析来揭示工艺参数与阻尼行为之间的显著依存关系。还利用回归模型来评估上述统计结果。以刚度作为中介变量，开发了多个三阶多项式来表示工艺参数与模态阻尼比之间的关系。所得结果表明，填充密度对阻尼行为有显著影响。较高的填充密度会产生较低的阻尼比。喷嘴尺寸对阻尼也有显著影响。在显著较低的喷嘴尺寸值下观察到较高的阻尼比。基于MEX结构中孔隙率的根本原因进行理论分析，证实了这些结果。
