Minghao Li , Zizhen Qi , Chenyang Jiang , Rong Chen , Yuliang Lin , Xiangcheng Li , Yuwu Zhang
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引用次数: 0
Abstract
Flexible metamaterials with low modulus but progressively enhanced compressive resistance have shown huge potential in flexible protection applications for personnel and sensitive equipment. Ascribed to the specific mechanical properties such as negative Poisson's ratios and significant compressibility, the chiral microstructural configurations have attracted great interests in energy absorption and can therefore be customized for specific designs. However, the more advanced design is still desired. In this paper, a three-dimensional curved chiral beam based lattice (3D-CCBL) was proposed by replacing the conventional straight trusses with curved chiral beams, aiming to achieve novel metamaterial with excellent flexibility and tailorable mechanical properties. Two types of 3D-CCBL specimens, with arc angles ranging from 120° to 210° were fabricated using the selective laser sintering (SLS) additive manufacturing technique. The compressive characteristics of 3D-CCBL were thoroughly investigated via experiments and simulations, considering the effects of anisotropy and relative density. In addition, a theoretical model was derived to predict the compressive modulus and plateau stress of 3D-CCBL, which achieved satisfactory agreement with both experimental measurements and numerical predictions. It is indicated that both types of 3D-CCBL mainly exhibited a bending-dominated deformation mode, although type II of 3D-CCBL possessed better energy-absorbing capacity and resistance to instability. The energy-absorbing capacity of 3D-CCBL can be enhanced by appropriately decreasing the arc angle, whereas the small angles would be more likely lead to instability. This paper provides a framework for guiding the design of three-dimensional flexible and ultra-lightweight metamaterials and promotes their applications in the fields of flexible protections.
期刊介绍:
Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses.
Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering.
The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.