Novel strategy using crash tubes adaptor for damage levels manipulation and total weight reduction

Esa, Moustafa; Xue, Pu; Zahran, M. S.; Abdelwahab, Mostafa; Khalil, Mohamed

doi:10.1016/j.tws.2016.11.018

Cited by 18 publications

(7 citation statements)

References 51 publications

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“…The material used in the test was aluminum alloy 6061, and the mechanical properties of the material were obtained through reference [37] and tensile tests. The test samples were prepared by 3D printing.…”

Section: Experimental Methods Designmentioning

confidence: 99%

Influence of Defects on In-Plane Dynamic Properties of Hexagonal Ligament Chiral Structures

Zhu

et al. 2022

Sustainability

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Although the six-ligament chiral structure has many unique properties, due to its special structure, the stress concentration is prone to defects. In addition, additive manufacturing is also prone to defects. This paper studies the effect of defects, which is helpful for the better application of the six-ligament chiral structure. Several new six-ligament chiral structures with random and concentrated defects were designed to explore the effects of the defects on the in-plane dynamic properties. The structures were studied with the finite element ANSYS/LSDYNA numerical simulation and experimental methods. According to the defect-free six-ligament chiral structures exhibiting different deformation modes at different impact velocities, the effects of the defect rate and type (concentrated and random defects) on the six-ligament chiral structure, the in-plane impact deformation mode and energy absorption characteristics are discussed. The research results show that the defect rate and type reduce the energy absorption characteristics of the chiral structure to varying degrees, and the impact deformation mode also changes under medium- and low-speed impact. With the increase in speed, the influence of the defects on the deformation mode weakens. Moreover, the effects of the concentrated and random defects on the platform stress are different. When the defect rate is low, the effect of the random defects is more significant, and as the defect rate increases, the effect of the concentrated defects is more obvious. The study can provide guidance for structural design, predict the failure form of structures containing defects when they are impacted, and realize material recycling.

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Section: Experimental Methods Designmentioning

confidence: 99%

Influence of Defects on In-Plane Dynamic Properties of Hexagonal Ligament Chiral Structures

Zhu

et al. 2022

Sustainability

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“…Cellular arrangement in 3D with a crush tube stiffened with plates arranged longitudinally at 90° to each other were attempted to reduce the fluctuations in the crush force behaviour 39 . Other novel approaches such as piece-meal energy absorption system for varying energy situations based on the impact velocity 40 ; tailor-welded blank based configuration with a precise combination of material grade and thickness along the crush tube to control the crush force behaviour 41 ; and thin-walled hierarchical lattice configurations with progressive deformation arrangements for controlling the crush behaviour 42 have provided impetus for this research.…”

Section: Review Of Geometric Cross-sections For Energy Absorptionmentioning

confidence: 99%

Study on Crush Tube Geometric Cross sections and Topology for Axial Crashworthiness

2020

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Crush tubes are used as crash impact energy absorbing structure (EAS) and are located in the frontal compartment of road vehicles. Ideal crashworthiness of an EAS mandates that the equivalent decelerations due to impact forces should to be ≤ 20g; and crush force and stroke efficiencies should tend to unity. It is understood from the literature that no single geometric cross-section shape exhibits a near-ideal crashworthiness; and most EAS members exhibit a high initial peak crush force which is detrimental to the occupant safety, and moderate stroke and crush force efficiencies leading to a compromise in the total energy absorbed. In this paper, finite element analysis (FEA) methodology is formulated and experimentally validated for axial crush of a crush tube of SS304 material with circular cross section. Subsequently, plastic deformation phenomenon and folding patterns in relation to crush force behaviour of crush tubes with various basic cross-sections of polygonal geometric shapes from triangle to octagon and circle are extensively studied through FEA. Further, two new geometric cross-section profiles with combination of basic shapes are proposed to combine the merits of different basic shapes. The crashworthiness of all basic cross-sections including the two proposed cross-section profiles is assessed based on standard parameters. The proposed new geometries may form a basis for the development of new EAS configurations for enhanced crashworthiness.

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“…The proposed energy absorber exhibits multistiffness behavior under the impact, showing different peak force levels as well. Afterward, the concept of piecemeal energy absorption (PEA) was introduced by Esa et al [ 6 ] . The PEA concept is similar to the GEA concept.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, some design approaches such as gradual energy absorption (GEA), piecemeal energy absorption (PEA), and conventional energy absorption (CEA) have been proposed. [5][6][7] The absorbers designed based on the PEA and GEA approaches show different peak force levels in force-displacement relation, whereas the CEA-based absorbers show a peak force level in their forcedisplacement relation. Xu et al [5] proposed a structure exhibiting the GEA for subway vehicles.…”

mentioning

confidence: 99%

4D Metamaterials with Zero Poisson's Ratio, Shape Recovery, and Energy Absorption Features

Hamzehei

Serjouei

et al. 2022

Adv Eng Mater

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Crashworthiness is the ability of the materials or structures to absorb impact energy through plastic deformations, friction, fracture, shear, bending, and even torsion. [1] Energy absorbers have been extensively used for different applications. The most prevalent applications can be found in the automotive, railway, and aerospace industries. [2,3] It is important to reduce the mortality rate caused by car crashes in the automotive industry. When it comes to passengers' safety, some critical crashworthy elements must be considered to design proper energy absorbers. The most vital item could be the initial reaction force caused by hitting an external object. [4] The lower the initial reaction force, the safer the occupants might be. A vehicle contains structural elements like rockers, pillars, and bumpers. Among these elements, the front bumper plays a vital role when it comes to energy absorption and is the most effective parameter for vehicle safety and occupants. The front bumper usually absorbs more than half of the kinetic energy during a car crash. [4] This is the main reason for magnifying the existence of high-performance energy absorbers Distinct from the initial reaction force, the crashworthy designers have been considering various main criteria for an ideal energy absorber, including high energy absorption performance, stability, and safety. Consequently, some design approaches such as gradual energy absorption (GEA), piecemeal energy absorption (PEA), and conventional energy absorption (CEA) have been proposed. [5][6][7] The absorbers designed based on the PEA and GEA approaches show different peak force levels in force-displacement relation, whereas the CEA-based absorbers show a peak force level in their forcedisplacement relation. Xu et al. [5] proposed a structure exhibiting the GEA for subway vehicles. The proposed energy absorber exhibits multistiffness behavior under the impact, showing different peak force levels as well. Afterward, the concept of piecemeal energy absorption (PEA) was introduced by Esa et al. [6] . The PEA concept is similar to the GEA concept. Due to the flexibility of the PEA concept over the GEA, this concept is extended to diverse applications. The PEA strategy provides lower damages under low-velocity impact and higher energy absorption capacity under high-velocity impact. Apart from the GEA and PEA concepts, most energy absorbers possess a CEA response. [7] The CEA response means a gradual increase in initial reaction forces under the impact and then the fluctuations in crushing forces are caused by overcoming the energy absorber's yield strength.

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Novel strategy using crash tubes adaptor for damage levels manipulation and total weight reduction

Cited by 18 publications

References 51 publications

Influence of Defects on In-Plane Dynamic Properties of Hexagonal Ligament Chiral Structures

Influence of Defects on In-Plane Dynamic Properties of Hexagonal Ligament Chiral Structures

Study on Crush Tube Geometric Cross sections and Topology for Axial Crashworthiness

4D Metamaterials with Zero Poisson's Ratio, Shape Recovery, and Energy Absorption Features

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