異なるユニットセル形状を持つ高分子ラティス構造の 低ひずみ速度域における圧縮特性

抄録

Along with the development of additive manufacturing, research on micro-lattice structures has been actively conducted because proper design of the unit cell structure can help achieve various mechanical properties, such as ultralightweight, high strength, and high energy absorption capacity. In aerospace, lattice structures made of polymer matrix composites have great potential, but their application requires an understanding of the properties of polymers. This study aims to clarify the strain rate dependence of the compressive properties of polymer lattice structures and the deformation modes of the struts forming their unit cells. Polymer lattice structures with different unit cell geometries were fabricated using a laser-based optical 3D printer, then compression tests were performed at different strain rates in the low strain rate range. Strain distributions on the side surfaces of the lattice structures were obtained by digital image correlation, revealing the principal deformation modes of the struts composing each structure. The relationship between the macroscopic compressive properties of the lattice structure and the principal deformation modes of the struts was confirmed. It was suggested that the strain rate dependence of the compressive properties depends on the principal deformation mode of the struts.