Retuerta Del Rey Guillermo, de Lucas Salgado Javier, González Hernández Alex Alberto, Chacón Tanarro Enrique
Grupo de Investigación en Ingeniería de Fabricación, Departamento Ingeniería Mecánica, Universidad Politécnica de Madrid, Spain.
GI-IM, Departamento Ingeniería Mecánica, Universidad Politécnica de Madrid, Spain.
Heliyon. 2024 Aug 5;10(17):e35652. doi: 10.1016/j.heliyon.2024.e35652. eCollection 2024 Sep 15.
The integration of carbon-fibre reinforced polymers (CFRP) in structural applications offers significant advantages due to their high strength-to-weight ratio. However, these materials exhibit limitations under out-of-plane loads, particularly in bearing applications. This study explores an innovative approach to enhance the performance of CFRP structures in such scenarios by incorporating annular polyamide inserts manufactured via additive manufacturing (AM). To evaluate the mechanical performance of the AM inserts, a novel ring tensile test is designed to emulate the bearing load conditions. This test also enables the analysis of the impact of several design and manufacturing parameters of the AM inserts, including surface geometry, surface treatment, internal structure, and curing process. These are then compared with specimens made of carbon fibre sheet moulding compounds (CF-SMC), commonly used to support bearing loads. The study reveals that AM inserts provide a viable alternative to state-of-the-art CF-SMC, offering a significant enhancement in mechanical properties under specific bearing loading conditions. The test results indicate a 17.7% improvement in the first failure limit and an 8.6% increase in the ultimate strength for AM inserts compared to CF-SMC. Additionally, the study develops a simplified analytical model to predict stress distributions and potential failure mechanisms, validating its efficacy through experimental data with discrepancies of less than 6%. Economic analysis underscores the cost benefits of AM inserts due to reduced labour and higher repeatability. This research demonstrates the potential of AM inserts to improve the stability and strength of CFRP structures, paving the way for their broader application in demanding load-bearing environments.
碳纤维增强聚合物（CFRP）在结构应用中的集成因其高比强度而具有显著优势。然而，这些材料在平面外载荷下表现出局限性，特别是在轴承应用中。本研究探索了一种创新方法，通过纳入通过增材制造（AM）制造的环形聚酰胺插入件，来提高CFRP结构在这种情况下的性能。为了评估增材制造插入件的力学性能，设计了一种新颖的环形拉伸试验来模拟轴承载荷条件。该试验还能够分析增材制造插入件的几个设计和制造参数的影响，包括表面几何形状、表面处理、内部结构和固化过程。然后将这些与由常用于支撑轴承载荷的碳纤维片状模塑料（CF-SMC）制成的试样进行比较。研究表明，增材制造插入件为现有的CF-SMC提供了一种可行的替代方案，在特定的轴承载荷条件下，其力学性能有显著提高。试验结果表明，与CF-SMC相比，增材制造插入件的首次失效极限提高了17.7%，极限强度提高了8.6%。此外，该研究还开发了一个简化的分析模型来预测应力分布和潜在的失效机制，并通过误差小于6%的实验数据验证了其有效性。经济分析强调了增材制造插入件由于劳动力减少和更高的可重复性而带来的成本效益。这项研究证明了增材制造插入件在提高CFRP结构稳定性和强度方面的潜力，为其在苛刻的承载环境中的更广泛应用铺平了道路。
