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EXPERIMENTAL AND THEORETICAL INVESTIGATION OF THE FIRST FOLD CREATION IN THIN WALLED COLUMNS
Authors:Abbas Niknejad  GHLiaghat  HMoslemi Naeini  AHBehravesh
Institution:1. Mechanical Engineering Department, Yasouj University, P.O. Box: 75914-353, Yasouj, Iran;2. Faculty of Engineering, Payame Noor University (PNU), Yazd Branch, P.O. Box: 89175-646, Yazd, Iran;3. Mechanical Engineering Department, Faculty of Engineering, Tarbiat Modares University, P.O. Box: 14115-143, Tehran, Iran;1. Mechanical Engineering Department, Yasouj University, P.O. Box: 75914-353, Yasouj, Iran;2. Mechanical Engineering Department, Yasouj University, P.O. Box: 75914-353, Yasouj, Iran;3. Mechanical Engineering Department, Tarbiat Modares University, P.O. Box: 14115-143, Tehran, Iran;1. Mechanical Engineering Department, Yasouj University, P.O. Box 75914-353, Yasouj, Iran;2. Mechanical and Aerospace Engineering Department, Shiraz University of Technology, Shiraz, Iran;3. Mechanical Engineering Department, Tarbiat Modares University, P.O. Box 14115-143, Tehran, Iran;1. School of Engineering, Sun Yat-Sen University, Guangzhou City 510006, China;2. School of Aerospace, Mechanical and Mechatronic Engineering, Sydney University, Sydney, NSW 2006, Australia;1. School of Engineering, SunYat-Sen University, Guangzhou City 510006, China;2. Department of Mechanical Science and Engineering, Nagoya University, Nagoya 464-8603, Japan;3. Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia;1. Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China;2. Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;3. Ningbo University, Ningbo, China
Abstract:In this paper,a theoretical formula is presented to predict the instantaneous folding force of the first fold creation in square and rectangular columns under axial loading.The rectangular column is a small and single model of honeycombs with square or rectangular cells.Calculations are based on the analysis of the Basic Folding Mechanism (BFM).For this purpose,sum of the dissipated energy rate under bending around horizontal and inclined hinge lines and the dissipated energy rate under extensional deformations was equal to the work rate of the external force on the structure.The final formula obtained in this research,reasonably predicts the instantaneous folding force of single-cell square and rectangular honeycombs instead of the average value.Finally,according to the calculated theoretical relation,the instantaneous folding force of the first fold creation in a square column was sketched versus folding distance and compared to the experimental results,which showed a good correlation.
Keywords:dissipated energy rate  first fold creation  instantaneous folding force  thin walled column
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