Abstract

This study focuses on the axial and oblique low-velocity impact response of thin-walled aluminium conical frusta with circular cutouts at two different locations through experimental and finite element procedures. In this regard, a circular cutout was laterally introduced on 15°, 25°, and 35° semi-apical angled conical frusta at mid-height (0.5 H_c) and three-fourth (0.75 H_c) of axis height. The low-velocity axial and oblique impact loading was performed with the perfect and imperfect (i.e. hole) conical frusta by varying the impact angle from 0° to 20° to the frustum axis and impact velocity from 4 m/s to 8 m/s. The changes in energy absorption (E_abs) and specific energy absorption (SEA) characteristics of perfect and imperfect conical frusta were analysed with the change of semi-apical angle of the frusta, location of the cutout, impact angle and direction of impact. The results show that the crush performance of 35° semi-apical angled perfect conical frustum is found to be better than 15° and 25° semi-apical angled specimens. Further, the SEA capacity of 25° semi-apical angled conical frusta having cutout at 0.75 H_c is found to be better than the SEA capacity of conical frusta having cutout at 0.5 H_c.

摘要

本研究的重点是通过实验和有限元程序，研究在两个不同位置具有圆形切口的薄壁铝锥体的轴向和倾斜低速冲击响应。在这方面，在中高 (0.5 H _c ) 和四分之三 (0.75 H _c ) 轴高的 15°、25° 和 35° 半顶角圆锥截头体上横向引入了圆形切口。使用完美和不完美（即孔）圆锥台进行低速轴向和斜向冲击载荷，将冲击角度从 0° 变化到 20°，将冲击速度从 4 m/s 变化到 8 m/s . 能量吸收的变化（E _abs) 和比能量吸收 (SEA) 特性，分析了完美和不完美圆锥台随着截头半顶角、切口位置、冲击角和冲击方向的变化。结果表明，35°半顶角完美圆锥截头体的抗压性能优于15°和25°半顶角试件。此外，发现在 0.75 H _c处具有切口的 25° 半顶角圆锥截头体的 SEA 能力优于在 0.5 H _c处具有切口的圆锥截头体的 SEA 能力。