3D printed modular Bouligand dissipative structures with adjustable mechanical properties for gradient energy absorbing

作者：Junfeng Xiao, Mengxing Zhang, Fei Zhai, Hongrui Wei, Sen Liu, Peng Wang, Zhiyang Liu, Zhongying Ji, Xiaolong Wang · 发表于：Materials Futures · 年份：2024 · DOI：10.1088/2752-5724/ad22cf · 被引用次数：11 · 研究领域：Advanced Materials and Mechanics、Advanced Sensor and Energy Harvesting Materials、Additive Manufacturing and 3D Printing Technologies

Abstract Three-dimensional (3D) printing allows for the creation of complex, layered structures with precise micro and macro architectures that are not achievable through traditional methods. By designing 3D structures with geometric precision, it is possible to achieve selective regulation of mechanical properties, enabling efficient dissipation of mechanical energy. In this study, a series of modular samples inspired by the Bouligand structure were designed and produced using a direct ink writing system, along with a classical printable polydimethylsiloxane ink. By altering the angles of filaments in adjacent layers (from 30° to 90°) and the filament spacing during printing (from 0.8 mm to 2.4 mm), the mechanical properties of these modular samples can be adjusted. Compression mechanical testing revealed that the 3D printed modular Bouligand structures exhibit stress-strain responses that enable multiple adjustments of the elastic modulus from 0.06 MPa to over 0.8 MPa. The mechanical properties were adjusted more than 10 times in printed samples prepared using uniform materials. The gradient control mechanism of mechanical properties during this process was analyzed using finite element analysis. Finally, 3D printed customized modular Bouligand structures can be assembled to create an array with Bouligand structures displaying various orientations and interlayer details tailored to specific requirements. By decomposing the original Bouligand structure and then assembling th...