Dezianian Shokouh, Azadi Mohammad
Faculty of Mechanical Engineering, Semnan University, Semnan 35131-19111, Iran.
Polymers (Basel). 2023 Apr 18;15(8):1927. doi: 10.3390/polym15081927.
In non-pneumatic tires, metamaterial cells could replace the pneumatic part of the tire. In this research, to achieve a metamaterial cell suitable for a non-pneumatic tire with the objective function of increasing compressive strength and bending fatigue lifetime, an optimization was carried out for three types of geometries: a square plane, a rectangular plane, and the entire circumference of the tire, as well as three types of materials: polylactic acid (PLA), thermoplastic polyurethane (TPU), and void. The topology optimization was implemented by the MATLAB code in 2D mode. Finally, to check the quality of cell 3D printing and how the cells were connected, the optimal cell fabricated by the fused deposition modeling (FDM) method was evaluated using field-emission scanning electron microscopy (FE-SEM). The results showed that in the optimization of the square plane, the sample with the minimum remaining weight constraint equal to 40% was selected as the optimal case, while in the optimization of the rectangular plane and the entire circumference of tire, the sample with the minimum remaining weight constraint equal to 60% was selected as the optimal case. From checking the quality of 3D printing of multi-materials, it was concluded that the PLA and TPU materials were completely connected.
在非充气轮胎中，超材料单元可以替代轮胎的充气部分。在本研究中，为了获得一种适用于非充气轮胎的超材料单元，以提高抗压强度和弯曲疲劳寿命为目标函数，对三种几何形状（方形平面、矩形平面和轮胎的整个圆周）以及三种材料（聚乳酸（PLA）、热塑性聚氨酯（TPU）和空隙）进行了优化。拓扑优化通过MATLAB代码在二维模式下实现。最后，为了检查单元3D打印的质量以及单元的连接方式，使用场发射扫描电子显微镜（FE-SEM）对通过熔融沉积建模（FDM）方法制造的最佳单元进行了评估。结果表明，在方形平面的优化中，选择剩余重量约束最小等于40%的样本作为最佳情况，而在矩形平面和轮胎整个圆周的优化中，选择剩余重量约束最小等于60%的样本作为最佳情况。通过检查多材料3D打印的质量得出结论，PLA和TPU材料完全连接。
