多孔工字梁的准静态压缩稳定性及能量吸收性能

Quasi-Static Compression Stability and Enegy Absorption Performance of Cellular I-Beam

轻量化多孔工字梁在外部荷载作用下具有优异的能量吸收特性。提出用胞元腹板代替实心腹板设计胞元腹板工字梁结构,基于方胞元、蜂窝胞元、内凹胞元和圆胞元4种胞元类型与方形、蜂窝、内凹和圆形4种腹板开孔孔型进行组合并设计构型。通过实验和有限元分析研究不同胞元类型和腹板开孔类型对工字梁压缩性能和能量吸收性能的影响。结果表明:胞元类型和腹板开孔类型对工字梁的压缩性能具有显著影响,方胞元工字梁的极限承载力最高,蜂窝胞元工字梁的吸能性能最好,而圆胞元工字梁的承载力和吸能性能较差,负泊松比胞元会使薄壁工字梁的失稳变形模式发生明显改变,内凹胞元能有效抑制工字梁发生向腹板两侧错位挤压失稳的趋势。

Lightweight cellular I-beams have excellent energy absorption characteristics under external loads.This paper proposes to use cell web instead of solid web to design the I-beam structure of cell web.Based on the combination of square cell,honeycomb cell,concave cell and round cell,and square,honeycomb,concave and circular web openings,the configuration of this paper was designed.The effects of different sibling type and web opening type on compression performance and energy absorption of I-beam were studied by experiments and finite element analysis.The results show that cell types and web hole types have significant effects on the compression performance of I-beam.The ultimate bearing capacity of square cell I-beam is larger,while honeycomb cell I-beam has the best energy absorption characteristics,while circular cell I-beam has poor bearing capacity and energy absorption performance.The negative Poisson’s ratio cell can significantly change the deformation mode of thin-walled I-beam,and the concave cell can effectively inhibit the dislocation extrusion instability trend of I-beam on both sides of the web.