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Indexed by:Journal Papers

Date of Publication:2019-11-01

Journal:THIN-WALLED STRUCTURES

Included Journals:EI、SCIE

Volume:144

ISSN No.:0263-8231

Key Words:Origami-based tube; Axial crushing; Collapsed mode; Energy absorption; Blow molding; Viscoelasticity

Abstract:The study aims to investigate the effects of origami morphology and interval distribution on the mechanical behavior of origami-based and conventional tubes. Quasi-static axial crushing experiments have been conducted on six geometrical types of polymeric tubes with different morphology (including arrangement and patterns), uniform and non-uniform interval. The polymeric tubes having viscoelasticity are fabricated through a polymer blow molding approach, in which, the approach can ensure the integrated formation of these tubes and avoid the structural asymmetry caused by the machining process. The experimental results show that it is convenient to observe the collapsed position, plastic hinges, and collapsed modes from the crushed and incompletely recovered shapes of the polymeric tubes after 24-h unloading. The initial elastic stiffness and initial peak force of the origami-based tubes reduce dramatically as compared with those of the conventional tubes under the axial crushing. In addition, the origami morphology and interval distribution can cause the initial collapse and have a large effect on the final collapsed mode of the tube, while the effect of wall thickness on the collapsed mode can be negligible. Therefore, the origami morphology or non-uniform interval distribution of the origami-based tubes can be used as a geometrical defect to change the collapsed mode and as a trigger to orient the initial collapse in a certain position of the tube in engineering design.