Crashworthiness of bionic fractal hierarchical structures

Zhang, Yong; Jin, Wang; Wang, Chunhui; Zeng, Yi; Chen, Tengteng

doi:10.1016/j.matdes.2018.08.028

Cited by 153 publications

(37 citation statements)

References 27 publications

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“…The energy absorption characteristics of the socalled bionic honeycomb thin-walled structure (BHTS) columns, inspired by the internal structure of the ladybeetle, were investigated [10]. Inspired by the shape of the spider web, columns with different geometries were designed, and their collision performances were compared [11].…”

Section: Literature Surveymentioning

confidence: 99%

“…Therefore, different design proposals are made by comparing the collision characteristics of thin-walled structures with different shapes and designed using different materials [7]. Multicellular columns are thin-walled structures, and although there are many studies in the literature on the energy dissipation performance of these structures [8][9][10][11], studies on regional hot-formed multi-cell columns are limited [12]. There are limited experimental studies on regional heat treatment of thin-walled structures in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Design of multi-cell tailored property columns under oblique loading

Öztürk

2021

International Journal of Automotive Science and Technology

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In this study, the crashworthiness performance of a multi-cell column designed from B1500HS boron steel with three different hardness values and six different regional hot-formed designs were compared in terms of passenger safety. Energy absorption and peak crushing force values of the columns were examined by impact simulations under oblique loading. “T25 heat-treated column” gave the highest energy absorption value, while "O25 heat-treated column" gave the lowest peak crushing force value. Regional hot-formed columns’ energy absorption and peak crushing force values resulted in between these two homogeneous heat-treated columns, except for the fifth and eighth designs. It has been shown that regional hot forming has a significant effect on the crashworthiness performance of the multi-cell columns under oblique loading.

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Section: Literature Surveymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of multi-cell tailored property columns under oblique loading

Öztürk

2021

International Journal of Automotive Science and Technology

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“…Following this theory, Farr [37][38][39] applied fractal principles to structure designs, showing the improvement in mechanical efficiency under gentle compressive loading conditions. So far, many studies have been conducted on fractal-like hierarchical honeycombs regarding both in-plane and out-of-plane properties [40][41][42][43][44][45][46][47][48][49]. In 2015, Meza et al [50] created structural metamaterials with exceptional strength, stiffness, and damage tolerance from materials in which unit cells were organized into a self-repeating geometry.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of PolyJet 3D-Printed Composites Inspired by Space-Filling Peano Curves

Tho

Tran

2021

Polymers

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This paper proposes a design of novel composite materials inspired by the Peano curve and manufactured using PolyJet 3D printing technology with Agilus30 (flexible phase) and VeroMagentaV (rigid phase) materials. Mechanical properties were evaluated through tensile and compression tests. The general rule of mixture (ROM) for composites was employed to approximate the tensile properties of the hybrid materials and compare them to the experimental results. The effect of reinforcement alignments and different hierarchies are discussed. The results indicated that the 5% inclusion of the Peano reinforcement in tensile samples contributed to the improvement in the elastic modulus by up to 6 MPa, but provided no obvious enhancement in ultimate tensile strength. Additionally, compressive strengths between 2 MPa and 6 MPa were observed for compression cubes with first-order reinforcement, while lower values around 2 MPa were found for samples with second-order reinforcement. That is to say, the first-order reinforcement has been demonstrated more effectively than the second-order reinforcement, given the same reinforcement volume fraction of 10% in compression cubes. Different second-order designs exhibited slightly different mechanical properties based on the ratio of reinforcement parallel to the loading direction.

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“…At present, the fractal theory has achieved some success in guiding the design of bionic structures. Zhang et al [17] observed the structure of spider webs, and used fractal theory to design bionic thin-walled tubular structures. Using the regular hexagon of the spider web as the basic structural unit, small hexagonal structures are placed at the apex positions of each hexagon.…”

Section: Introductionmentioning

confidence: 99%

A Novel Bionic Structure Inspired by Luffa Sponge and Its Cushion Properties

et al. 2020

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The luffa sponge shows excellent cushion properties. This paper presents a bio-inspired structure of the luffa sponge. The geometry of the bionic structure was built based on the fractal theory by Python programming language and prepared by a 3D printer. Then a series of quasi-static compression tests and finite element analysis were carried out to determine the cushion properties. An optimization design was adopted to determine the best design parameter. The results showed that the influence of length (a) on specific energy absorption was more important than the degree (θ). The best parameter was found to be length less than 4 mm and angle around 11 degrees. The bionic structure of luffa sponge may show a novel perspective on natural cellular material. The findings demonstrate the great potential for designing hierarchical cellular structures and broad application prospects in the field of cushioning and energy absorption.

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Crashworthiness of bionic fractal hierarchical structures

Cited by 153 publications

References 27 publications

Design of multi-cell tailored property columns under oblique loading

Design of multi-cell tailored property columns under oblique loading

Mechanical Properties of PolyJet 3D-Printed Composites Inspired by Space-Filling Peano Curves

A Novel Bionic Structure Inspired by Luffa Sponge and Its Cushion Properties

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