Composite energy-absorbing structures combining thin-walled metal and honeycomb structures

2016 ◽  
Vol 231 (4) ◽  
pp. 394-405 ◽  
Author(s):  
Hui Zhou ◽  
Ping Xu ◽  
Suchao Xie
Keyword(s):  
Metal Structure ◽  
Honeycomb Structure ◽  
Railway Vehicle ◽  
Hardening Material ◽  
Honeycomb Structures ◽  
Anisotropic Mechanical Properties ◽  
Aluminum Honeycomb ◽  
Thin Walled ◽  
Energy Absorbing ◽  
Composite Energy

The energy-absorbing structure of a crashworthy railway vehicle was designed by combining the characteristics of thin-walled metal structures and aluminum honeycomb structures: finite element models of collisions involving energy-absorbing structures were built in ANSYS/LS-DYNA. In these models, the thin-walled metal structure was modeled as a plastic kinematic hardening material, and the honeycomb structure was modeled as an equivalent solid model with orthotropic–anisotropic mechanical properties. The analysis showed that the safe velocity standard for rail vehicle collisions was improved from 25 km/h to 45 km/h by using a combined energy-absorbing structure; its energy absorption exceeded the sum of the energy absorbed by the thin-walled metal structure and honeycomb structure when loaded separately, because of the interaction effects of thin-walled metal structure and aluminum honeycomb structure. For an aluminum honeycomb to the same specification, the composite structure showed the highest SEA when using a thin-walled metal structure composed of bi-grooved tubes, followed by that using single-groove tubes: that with a straight-walled structure had the lowest SEA.

The energy-absorbing characteristics of carbon fiber-reinforced epoxy honeycomb structures

2018 ◽  
Vol 53 (9) ◽  
pp. 1145-1157 ◽  
Author(s):  
RA Alia ◽  
O Al-Ali ◽  
S Kumar ◽  
WJ Cantwell
Keyword(s):  
Carbon Fiber ◽  
Honeycomb Structure ◽  
Mechanical Tests ◽  
Fiber Reinforced ◽  
Stable Mode ◽  
Honeycomb Structures ◽  
The Core ◽  
Carbon Fiber Reinforced ◽  
Energy Absorbing ◽  
Core Materials

This paper investigates the compression properties and energy-absorbing characteristics of a carbon fiber-reinforced honeycomb structure manufactured using the vacuum-assisted resin transfer molding method (VARTM). The composite core materials were manufactured using a machined steel baseplate onto which hexagonal blocks were secured. A unidirectional carbon fiber fabric was inserted into the slots and the resulting mold was vacuum bagged and infused with a two-part epoxy resin. After curing, the hexagonal blocks were removed, leaving a well-defined composite honeycomb structure. Samples were then cut from the composite cores and inspected in an X-ray computed tomography machine prior to testing. Mechanical tests on the honeycomb structures yielded compression strengths of up to 35 MPa and specific energy absorption values in excess of 47 kJ/kg. When normalized by the density of the core, the resulting values of specific strength were significantly higher than those measured on traditional core materials. The unidirectional cores failed as a result of longitudinal splitting through the thickness of the core, whereas the multidirectional honeycombs failed in a combined splitting/fiber fracture mode, absorbing significantly more energy than their unidirectional counterparts. Increasing the weight fraction of fibers served to increase the strength and energy-absorbing capacity of the core. Finally, it was also shown that introducing a chamfer acted to reduce the initial peak force and precipitate a more stable mode of failure.

Comparing Study of Energy-Absorbing Behavior for Honeycomb Structures

2011 ◽  
Vol 462-463 ◽  
pp. 13-17 ◽  
Author(s):  
Yan Wang ◽  
P. Xue ◽  
J.P. Wang
Keyword(s):  
Cell Wall ◽  
Energy Absorption ◽  
Honeycomb Structure ◽  
Absorption Capacity ◽  
Cell Geometry ◽  
Energy Absorption Capacity ◽  
Plateau Stress ◽  
Honeycomb Structures ◽  
Multifunctional Material ◽  
Energy Absorbing

Honeycomb materials，as a type of ultra-light multifunctional material，have been examined extensively in recent years and have been applied in many fields. This study investigated the energy absorption capacity and their mechanisms of honeycomb structures with five different cell geometry (square，triangular，circular, hexagonal，kagome). It has been shown that the honeycomb structure with kagome cells is the best choice under the targets of the energy absorption capacity, peak force and plateau stress, when relative density and cell wall thickness of the five kinds of honeycombs are the same. Besides, honeycomb with hexagonal cells and honeycomb with triangular cells are also ideal structures for energy absorption purpose.

Experimental Study of Energy Absorption of Fluid-Filled Honeycomb Structure

2014 ◽  
Author(s):  
S. Jenson ◽  
M. Ali ◽  
K. Alam ◽  
J. Hoffman
Keyword(s):  
Energy Absorption ◽  
High Speed ◽  
Honeycomb Structure ◽  
High Speed Camera ◽  
Damage Area ◽  
Impact Forces ◽  
Aluminum Honeycomb ◽  
Energy Absorbing ◽  
The Impact ◽  
Absorption Characteristics

The work presented here is a continuation of the study performed in exploring the energy absorption characteristics of non-Newtonian fluid-filled regular hexagonal aluminum honeycomb structures. In the previous study, energy absorbing properties were investigated by using an air powered pneumatic ram, dynamic load cell, and a high speed camera. This study was conducted using a pneumatic ram which was designed to exploit only its kinetic energy during the impact. Experimental samples included an empty honeycomb sample and a filled sample as the filled samples showed the largest difference in energy absorption with respect to the empty samples in the previous study. Therefore, the filled samples were further investigated in this study by measuring the impact forces at the distal end as well as the damage on the impact end. Upon impact, the filled samples were able to reduce the damage area on impact end and were able to lower average and peak forces by 71.9% and 77.4% at the distal end as compared to the empty sample.

Design and fabrication of aluminum honeycomb structures based on origami technology

2017 ◽  
Vol 21 (4) ◽  
pp. 1224-1242 ◽  
Author(s):  
Lijun Wang ◽  
Kazuya Saito ◽  
You Gotou ◽  
Yoji Okabe
Keyword(s):  
Mechanical Properties ◽  
Honeycomb Structure ◽  
Bending Test ◽  
Displacement Curve ◽  
Element Analysis ◽  
Folding Process ◽  
Honeycomb Structures ◽  
Aluminum Honeycomb ◽  
Deformation Behaviors ◽  
Honeycomb Cores

Aluminum alloy honeycomb structures were designed based on origami technology, and the specimens were fabricated by a new fabrication technology (i.e. a press and folding process). In folding process, a new folding device was successfully developed to achieve automatic fabrication of honeycomb structure. To prove the practicability of developed device, the honeycomb cores with claws were fabricated by this device, which were used to compare the mechanical properties with that bonded by common adhesive. The deformation behaviors and mechanical properties of honeycomb structures were investigated by the flatwise compressive test and three-point bending test. The load–displacement curve obtained at the room temperature showed that the load increased to a peak value and then tended rapidly to a constant. Besides, the deformation process approximately categorized into three zones, namely linear-elastic zone, plastic-plateau zone, and densification zone. The experimental results suggested that regardless of specimen type, the bending stiffness and compressive strengths were approximately 0.32 KN·m2and 0.39 MPa, respectively; revealing the bonded method by aluminum claws did not dramatically affect the mechanical properties of honeycomb structure. Moreover, the elastic deformation of honeycomb structure was numerically studied by the finite element analysis.

Energy absorbing capability of additive manufactured multi-material honeycomb structure

2019 ◽  
Vol 25 (3) ◽  
pp. 623-629 ◽  
Author(s):  
Vijayanand Rajendra Boopathy ◽  
Anantharaman Sriraman ◽  
Arumaikkannu G.
Keyword(s):  
Compressive Load ◽  
Honeycomb Structure ◽  
Maximum Force ◽  
Impact Loads ◽  
Content Type ◽  
Honeycomb Structures ◽  
Multiple Materials ◽  
Energy Absorbing ◽  
Single Material ◽  
Minimum Force

Purpose The present work aims in presenting the energy absorbing capability of different combination stacking of multiple materials, namely, Vero White and Tango Plus, under static and dynamic loading conditions. Design/methodology/approach Honeycomb structures with various multi-material stackings are fabricated using PolyJet 3D printing technique. From the static and dynamic test results, the structure having the better energy absorbing capability is identified. Findings It is found that from the various stacking combinations of multiple materials, the five-layered (5L) sandwich multi-material honeycomb structure has better energy absorbing capability. Practical implications This multi-material combination with a honeycomb structure can be used in the application of crash resistance components such as helmet, knee guard, car bumper, etc. Originality/value Through experimental work, various multi-material honeycomb structures and impact resistance of single material clearly indicated the inability to absorb impact loads which experiences a maximum force of 5,055.24 N, whereas the 5L sandwich multi-material honeycomb structure experiences a minimum force of 1,948.17 N, which is 38.5 per cent of the force experienced by the single material. Moreover, in the case of compressive resistance, 2L sandwich multi-material honeycomb structure experiences a maximum force of 5,887.5 N, whereas 5L sandwich multi-material honeycomb structure experiences a minimum force of 2,410 N, which is 40.9 per cent of the force experienced by two-layered (2L) sandwich multi-material honeycomb structure. In this study, the multi-material absorbed most of the input energy and experienced minimum force in both compressive and impact loads, thus showing its energy absorbing capability and hence its utility for structures that experience impact and compressive loads. A maximum force is required to deform the single and 2L material in terms of impact and compressive load, respectively, under maximum stiffness conditions.

Damping of a thin-walled honeycomb structure using energy absorbing foam

2006 ◽  
Vol 291 (1-2) ◽  
pp. 491-502 ◽  
Author(s):  
Shane C. Woody ◽  
Stuart T. Smith
Keyword(s):  
Honeycomb Structure ◽  
Thin Walled ◽  
Energy Absorbing

scholarly journals Blast-Induced Compression of a Thin-Walled Aluminum Honeycomb Structure—Experiment and Modeling

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1350 ◽  
Author(s):  
Magda Stanczak ◽  
Teresa Fras ◽  
Ludovic Blanc ◽  
Piotr Pawlowski ◽  
Alexis Rusinek
Keyword(s):  
Blast Loading ◽  
Honeycomb Structure ◽  
Structural Deformation ◽  
Test Configuration ◽  
Time Period ◽  
Free Air ◽  
Blast Effects ◽  
Aluminum Honeycomb ◽  
Thin Walled ◽  
Set Up

The presented discussion concerns the behavior of a thin-walled hexagonal aluminum honeycomb structure subjected to blast loading. The shock wave affecting the structure is generated by detonation of the C4 charge in an explosive-driven shock tube (EDST). The EDST set-up is an instrumented device that makes it possible to study blast effects in more stable and repeatable conditions than those obtained in a free-air detonation. The formation of folds characteristic of a honeycomb deformation in the axial compression distributes the initial loading over a time period, which is considered as an efficient method of energy dissipation. The test configuration is modeled in the Ls-Dyna explicit code, which enables analysis of the mechanisms of energy absorption that accompanies structural deformation under a blast loading. The conclusions reached in the performed experimental and numerical investigation can be applied to the modeling and optimization of cellular structures used to mitigate blast loadings.

scholarly journals Experimental Study on Dynamic Compression Mechanical Properties of Aluminum Honeycomb Structures

2020 ◽  
Vol 10 (3) ◽  
pp. 1188 ◽  
Author(s):  
Sheng Zhang ◽  
Wei Chen ◽  
Deping Gao ◽  
Liping Xiao ◽  
Longbao Han
Keyword(s):  
Mechanical Properties ◽  
Strain Rate ◽  
High Strain ◽  
Dynamic Compression ◽  
Honeycomb Structure ◽  
Strain Rates ◽  
Compression Tests ◽  
High Strain Rates ◽  
Honeycomb Structures ◽  
Aluminum Honeycomb

In this paper, dynamic compression tests are developed to investigate the dynamic compression mechanical properties of the aluminum honeycomb structures at different strain rates, especially at the high strain rates. The difficulties at the high strain rates exist due to the large deformation, the low wave resistance and the size effect of the honeycomb structures. The Split Hopkinson Pressure Bar (SPHB) test method is carried out and special measures such as the adoption of waveform shaper, the size optimization of the impact bar and the specimen, and employment of the semiconductor strain gauge, etc. are taken to overcome the difficulties. It is discovered that the dynamic compression mechanical properties possess a stress hardening effect at a high strain rate from 1.3 × 103 s−1 to 2.0 × 103 s−1, but then a stress softening effect at a high strain rate of 4.6 × 103 s−1. It is also discovered that the yield strength and the average plateau stress at the strain rate of 2.0 × 103 s−1 is higher than that at the strain rate of 1.3 × 103 s−1. However, the yield strength and the average plateau stress at the strain rate of 4.6 × 103 s−1 is lower than that at the strain rate of 2.0 × 103 s−1 and 1.3 × 103 s−1, but higher than that at a quasi-static state. This indicates that the aluminum honeycomb structure is sensitive to the strain rate. Additionally, the damage mode of the aluminum honeycomb structure is plastic buckling, collapse and folding of the cell wall, which is carried out using dynamic compression tests. The folding length of the cell wall at a higher strain rate is found to be longer than that at a lower strain rate. The test results can also be used as the stress–strain curves of the honeycomb constitutive model at the high strain rates to carry out the numerical simulation of high-speed impact.

NICROBRAZ 50

Alloy Digest ◽  
1994 ◽  
Vol 43 (8) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Honeycomb Structures ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Low Solubility

Abstract NICROBRAZ 50 is a low-melting, free-flowing filter metal for honeycomb structures and thin-walled tube assemblies. It has low solubility. This datasheet provides information on composition, physical properties, and hardness. It also includes information on corrosion resistance as well as joining. Filing Code: Ni-460. Producer or source: Wall Colmonoy Corporation.

Axial crushing responses of aluminum honeycomb structures filled with elastomeric polyurethane foam

2021 ◽  
Vol 164 ◽  
pp. 107785
Author(s):  
Yousef Mohamadi ◽  
Hamed Ahmadi ◽  
Omid Razmkhah ◽  
Gholamhossein Liaghat
Keyword(s):  
Polyurethane Foam ◽  
Axial Crushing ◽  
Honeycomb Structures ◽  
Aluminum Honeycomb
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