Tobalina-Baldeon Daniel, Sanz-Adán Felix, Martinez-Calvo Marian, Gómez Carmelo, Sanz-Pena Inigo, Cavas Francisco
Department of Mechanical Engineering, University of La Rioja, 26004 Logroño, Spain.
International School of Doctorate, Technical University of Cartagena, 30202 Cartagena, Spain.
Polymers (Basel). 2021 Jun 8;13(12):1904. doi: 10.3390/polym13121904.
The use of composite materials has shown steady growth in recent years due to their excellent specific mechanical properties and the possibility to reduce the weight of vehicles without impairing their safety and comfort. Continuous fibre-reinforced thermoplastic composites (CFRTP) show dynamic, acoustic, and damping properties far superior to steel and can be recycled and repaired. Their excellent properties make CFRTP good candidates for anti-vibration and shock absorbing components, however, out-of-plane mechanical properties hinder the anchoring to the vehicle's body by means of bolted connections. The results obtained in this study show how the maximum torque that can be applied without cracks or breakage phenomena is lower than in standard steel joints. Although the preload's value is admissible, this one is reduced over time due to relaxation phenomena associated with the viscoelastic behaviour of thermoplastic matrix. The results obtained can be improved with the integration of metal inserts in connections' areas. In this study, a case study of a gear mount replacing the steel core with CFRTP reinforced with inserts is carried out. The results show a reduction above 50% in weight, opening the possibility of lighter structures in the automotive sector.
近年来，由于复合材料具有优异的比机械性能，且有可能在不损害车辆安全性和舒适性的前提下减轻车辆重量，其使用量呈稳步增长态势。连续纤维增强热塑性复合材料（CFRTP）具有远优于钢材的动态、声学和阻尼性能，并且可以回收和修复。其优异的性能使CFRTP成为抗振动和减震部件的理想选择，然而，其面外机械性能阻碍了通过螺栓连接锚固到车辆车身。本研究获得的结果表明，在不出现裂纹或破损现象的情况下能够施加的最大扭矩低于标准钢接头。尽管预紧力的值是允许的，但由于与热塑性基体的粘弹性行为相关的松弛现象，该值会随时间降低。通过在连接区域集成金属嵌件，可以改善所获得的结果。在本研究中，开展了一个用带嵌件增强的CFRTP取代钢芯的齿轮支架的案例研究。结果表明重量减轻了50%以上，为汽车行业采用更轻的结构开辟了可能性。
