Behaviour of hollow circular section with multiple perforations under compression, flexure and torsion

Abstract Effect of the presence of perforations on thin structure has been extensively investigated for decades. Various perforation parameters were investigated in past studies. However, study on thin cylinder with multiple perforations has not been carried out. In searching for lighter structural members, the concept of perforated hollow section has been inspired by the shape and arrangement of multiple perforations observed in the Cholla skeleton. Effects of multiple perforation parameters on circular hollow section have been the main interest. This paper presents the verification of FEM simulation with test results. A non-perforated circular hollow section (control model) and a circular hollow section penetrated with 12 nos. of circular shape perforations in array arrangement were selected for the verification process. Both test specimen and FEA models were subjected to compression, flexural and torsional loads. For result comparison within the material linear range, FEA models show good agreement with test results for compression and flexural load cases, and for control models under torsional load case. For perforated models under torsional load, FEA results correspond well with the inclined strain gauge readings. FEM analysis method is considered capable to produce reliable result for loading within the material linear range for circular hollow sections with multiple perforations.

摘要：数十年来，学界已对穿孔对薄壁结构的影响开展了大量研究。过往研究已针对各类穿孔参数展开了探究，但目前尚未有针对带多穿孔薄壁圆柱的相关研究。为寻求更轻质的结构构件，带穿孔空心截面的设计理念灵感源自乔利亚（Cholla）仙人掌骨骼结构中观察到的多穿孔形态与排布方式。本次研究的核心关注点为多穿孔参数对圆形空心截面的影响。本文通过试验结果对有限元法（Finite Element Method, FEM）模拟进行验证。验证过程选取了无穿孔圆形空心截面（对照组模型）与12个呈阵列排布的圆形穿孔圆形空心截面作为研究对象。试验试件与有限元分析（Finite Element Analysis, FEA）模型均承受压缩、弯曲与扭转荷载。在材料线性范围内进行结果对比时，有限元分析模型在压缩、弯曲荷载工况下，以及扭转荷载工况下的对照组模型均与试验结果吻合良好。而带穿孔模型在扭转荷载工况下，有限元分析结果与斜向应变片的读数同样匹配度较高。综上，有限元法分析方法可在材料线性范围内，为带多穿孔的圆形空心截面提供可靠的分析结果。