Print Email Facebook Twitter Crashworthiness analysis of empty and foam-filled circular tubes with functionally graded thickness Title Crashworthiness analysis of empty and foam-filled circular tubes with functionally graded thickness Author Barzigar, Seyed Sajad (Tarbiat Modares University) Ahmadi, Hamed (Tarbiat Modares University) Liaghat, Gholamhossein (Tarbiat Modares University; Oxford Brookes University) Seidi, Morteza (University of Texas at San Antonio) Mirzaali, Mohammad J. (TU Delft Biomaterials & Tissue Biomechanics) Date 2024 Abstract Thin-wall structures, particularly thin-walled tubes, play a critical role in load-bearing structures. Enhancing their ability to withstand crushing loads can significantly improve the overall damping efficiency of the system. Functionally graded thickness (FGT) is a promising approach for enhancing the load-bearing properties of thin-walled tubes by enabling control over material usage and localized deformation patterns within the structure. In this study, we proposed a novel theoretical model that analyzes the crushing behavior of hollow and foam-filled FGT thin-walled circular tubes by considering four primary failure mechanisms that contribute to energy dissipation: (1) bending of plastic hinges, (2) membrane stretching, (3) axial foam crushing, and (4) the interaction between foam and the tube's wall. We validated our model against experimental results from previous researchers and observed a good agreement. Additionally, we conduct a comprehensive study to examine the effects of various geometrical parameters, such as power-law functions and normalized wall thickness ratio, on the crushing behavior of FGT structures. Our results demonstrate the accuracy and reliability of our theoretical model and highlight the potential of FGT structures to enhance the performance of thin-walled tubes in a range of load-bearing applications. Subject Circular tubeFoam-filled tubeFunctionally graded thicknessTheoretical modelThin-wall structures To reference this document use: http://resolver.tudelft.nl/uuid:dff4191e-34f3-481e-a0b0-e7188975dc6d DOI https://doi.org/10.1007/s40430-024-04781-6 Embargo date 2024-09-12 ISSN 1678-5878 Source Brazilian Society of Mechanical Sciences and Engineering. Journal, 46 (4) Bibliographical note Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2024 Seyed Sajad Barzigar, Hamed Ahmadi, Gholamhossein Liaghat, Morteza Seidi, Mohammad J. Mirzaali Files file embargo until 2024-09-12