Controllable Energy Absorption Design and 3D Printing of High Energy Absorbing Biomimetic Double-Layer Impact-Resistant Structure
Leilei Wang, Leilei Wang, Zhiqiang Tong, Facheng Song, Wencheng Yin, Ling Wang, Ling Wang, Kai Miao, Dichen Li
Abstract
• A bionic structure was designed for purpose of energy absorption with respect of limited design space and manufacturing feasibility for engineering applications. • Finite Element Analysis was employed to investigate the effect of structural parameters on the energy absorption capabilities. • A wide range of energy absorption can be achieved by adjusting the structural parameters of the designed double-layer impact-resistant structure. In engineering, the demand for high energy absorption by structures subjected to impact loads is increasing. Balancing the limited space, manufacturing feasibility, and energy absorption capabilities is a key point in the design of many enclosed structures with energy absorption requirements. To achieve a lightweight design and controllable energy absorption by the structures, within a limited space, this study proposes a bio-inspired double-layer impact-resistant structure that can be manufactured by an additive manufacturing method (powder bed fusion), inspired by the microstructure of a woodpecker's head. The structure is composed of two basic structural units: a quasi-circular ring and an oblique cylinder. The controllable energy absorption capabilities of the structure were studied through a combination of theoretical analyses, numerical simulations, and physical experiments. The results showed that, for the quasi-circular ring structure, the specific energy absorption range of 13–72 J/g could be effectively regulated by adjusting the structural parameters. The specific energy absorption range of 11–137 J/g could be effectively regulated for oblique cylindrical structures. Finally, the structure was applied to the design of engineering impact-resistant devices, proving the effectiveness of the controllable energy absorption of the structure. Moreover, the design process of the structure was optimized, laying a foundation for the structure to better serve engineering design applications.