scholarly journals Response and Energy Absorption of Concrete Honeycombs Subjected to Dynamic In-Plane Compression: A Numerical Approach

Symmetry ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 175
Author(s):  
Wenjing Shen ◽  
Hongyuan Zhou ◽  
Xuejian Zhang ◽  
Xiaojuan Wang
Keyword(s):  
Energy Absorption ◽  
Progressive Collapse ◽  
Numerical Approach ◽  
Absorption Capacity ◽  
Foam Concrete ◽  
Stress Plateau ◽  
Collapse Mode ◽  
Particle Hydrodynamics ◽  
Plane Compression ◽  
Response Modes

Foam concrete exhibits long stress plateau with increasing strain subjected to compression and absorbs a considerable amount of energy, making them promising for building and structure protection. In the present study, hexagonal concrete honeycombs are employed to approximately represent foam concrete, whose response and energy absorption subjected to dynamic in-plane compression are investigated with smooth particle hydrodynamics method. The response modes under low to high velocity crushing are numerically investigated, with which the critical velocity separating quasi-static response and progressive collapse mode is determined. Furthermore, the dynamic energy absorption capacity is examined and discussed.

The Energy Absorption Characteristics of Square Mild Steel Tubes With Multiple Induced Circular Hole Discontinuities—Part I: Experiments

2009 ◽  
Vol 76 (4) ◽  
Author(s):  
S. B. Bodlani ◽  
S. Chung Kim Yuen ◽  
G. N. Nurick
Keyword(s):  
Mild Steel ◽  
Energy Absorption ◽  
Circular Hole ◽  
Progressive Collapse ◽  
Experimental Tests ◽  
Absorption Capacity ◽  
Peak Force ◽  
Steel Tubes ◽  
Initial Peak ◽  
Absorption Characteristics

This two-part article reports the results of experimental and numerical works conducted on the energy absorption characteristics of thin-walled square tubes with multiple circular hole discontinuities. Part I presents the experimental tests in which dynamic and quasistatic axial crushings are performed. The mild steel tubes are 350 mm in length, 50 mm wide, and 1.5 mm thick. Circular hole discontinuities, 17 mm in diameter, are laterally drilled on two or all four opposing walls of the tube to form opposing hole pairs. The total number of holes varies from 2 to 10. The results indicate that the introduction of holes decreases the initial peak force but an increase in the number of holes beyond 2 holes per side does not further significantly decrease the initial peak force. The findings show that strategic positioning of holes triggers progressive collapse hence improving energy absorption. The results also indicate that the presence of holes may at times disrupt the formation of lobes thus compromising the energy absorption capacity of the tube. In Part II, the finite element package ABAQUS/EXPLICIT version 6.4–6 is used to model the dynamic axial crushing of the tubes and to investigate the action of the holes during dynamic loading at an impact velocity of 8 m/s.

scholarly journals CFRP Reinforced Foam Concrete Subjected to Dynamic Compression at Medium Strain Rate

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 10 ◽  
Author(s):  
Xiaojuan Wang ◽  
Lu Liu ◽  
Wenjing Shen ◽  
Hongyuan Zhou
Keyword(s):  
Strain Rate ◽  
Energy Absorption ◽  
Dynamic Compression ◽  
Absorption Capacity ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Foam Concrete ◽  
Energy Absorption Capacity ◽  
Reinforced Polymer ◽  
Medium Strain Rate

Carbon fiber-reinforced polymer (CFRP)-confined foam concrete can be applied in structure protection, e.g., as an impact barrier of bridge piers, in which it is used as the core of the composite impact barrier. Applying CFRP to the foam concrete exterior enhances both the CFRP and the foam concrete, leading to improved compressive performance due to their interaction. In the present study, the carbon-fiber reinforced polymer (CFRP) confining effect on the response and energy absorption of foam concrete subjected to quasi-static and medium-strain-rate dynamic compression was experimentally investigated. The confinement by CFRP changed the response and failure mode of foam concrete specimens from shear in quasi-static load and splitting in dynamic load to crushing, resulting in a significant increase in the load bearing and energy absorption capacity. The composite consisting of CFRP and foam concrete was sensitive to strain rate. In particular, the CFRP–foam concrete interaction led to the remarkably improved resistance and energy absorption capacity of CFRP-confined specimens, which were significantly higher than the sum of those of standalone CFRP and foam concrete.

scholarly journals Influence of the Geometric Parameters on the Densification Onset Strain of Double-Walled Honeycomb Aluminum under Out-of-Plane Compression

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Jian Wang ◽  
Ying Cao
Keyword(s):  
Energy Absorption ◽  
Wall Thickness ◽  
Least Squares Method ◽  
Absorption Capacity ◽  
Geometric Design ◽  
Design Parameters ◽  
Element Analysis ◽  
Static Compression ◽  
Out Of Plane ◽  
Plane Compression

As a material widely used in various lightweight structures and energy absorbing devices, honeycomb aluminum has high specific stiffness and specific strength, excellent energy absorption capacity, and vibration damping. When evaluating the energy absorption of honeycomb aluminum under out-of-plane compression, platform stress and onset strain of densification have become important parameters studied by many scholars. In this work, based on the theory that the energy absorption efficiency determines the densification onset strain, the influence of the geometric design parameters of honeycomb aluminum on the onset strain of out-of-plane quasi-static compression densification is studied. Based on the results of the finite element analysis, the relationship between the onset strain and the geometric design parameters including cell size length and wall thickness is fitted by the least squares method. A linear relationship that the onset strain of densification will decrease with the increase of the reciprocal of cell side length and the onset strain of densification will decrease with the increase of the wall thickness is exhibited in the conclusion. This work can provide a theoretical basis for the calculation of the platform stress in the plastic deformation stage.

Improving the Energy Absorption of Cruciform With Large Global Slenderness Ratio by Kirigami Approach and Welding Technology

2019 ◽  
Vol 86 (8) ◽  
Author(s):  
Caihua Zhou ◽  
Tong Li ◽  
Shizhao Ming ◽  
Zhibo Song ◽  
Bo Wang
Keyword(s):  
Energy Absorption ◽  
Progressive Collapse ◽  
Slenderness Ratio ◽  
Absorption Capacity ◽  
Buckling Mode ◽  
Euler Buckling ◽  
Thin Walled Structures ◽  
Welding Technology ◽  
Parametric Studies ◽  
Thin Walled

Conventional energy absorber usually employs stubby thin-walled structures. Compared with the limited number of stubby thin-walled structures, an equipment has a large number of slender thin-walled structures that has the potential to be used for energy absorption purpose as well. Therefore, improving the energy absorption capacity of these slender thin-walled structures can significantly benefit the crashworthiness of the equipment. However, these slender structures are inclined to deform in Euler buckling mode, which greatly limits their application for energy absorption. In this paper, kirigami approach combined with welding technology is adopted to avoid the Euler buckling mode of a slender cruciform. Both finite element simulations and experiments demonstrated that the proposed approach can trigger a desirable progressive collapse mode and thus improve the energy absorption by around 155.22%, compared with the conventional cruciform. Furthermore, parametric studies related to the kirigami pattern and global slenderness ratio (GSR) are conducted to investigate the improvement of this proposed approach on the energy absorption and the maximum critical value of GSR.

Quasi-Static Axial Compression of Origami Crash Boxes

2017 ◽  
Vol 09 (05) ◽  
pp. 1750066 ◽  
Author(s):  
C. H. Zhou ◽  
B. Wang ◽  
H. Z. Luo ◽  
Y. W. Chen ◽  
Q. H. Zeng ◽  
...  
Keyword(s):  
Energy Absorption ◽  
Axial Compression ◽  
Optical Measurement ◽  
Electrical Measurement ◽  
Absorption Capacity ◽  
Compression Tests ◽  
Geometric Imperfection ◽  
Crushing Force ◽  
Collapse Mode ◽  
Element Theory

The origami crash box has been recognized as an efficient energy absorption device. In this paper, quasi-static axial compression tests and numerical simulations are carried out to investigate the energy absorption capacity of origami crash box. The complete diamond mode could be successfully triggered, which indicates that this collapse mode is insensitive to geometric imperfection when the tube is subjected to quasi-static loading. And the results confirm that axially compressed tubes with longer modules ([Formula: see text]) renders higher mean crushing force than those with short modules ([Formula: see text]). Moreover, in order to figure out the energy dissipation percentage of each region in origami crash box, the plastic deformation of shells in two representative regions is measured and analyzed by utilizing electrical measurement and noncontact optical measurement. The results reveal that about 10% of total energy is absorbed by those shells, which is large enough to affect the prediction accuracy of expressions deduced by super folding element theory.

Improving energy absorption capacity of foam concrete with gradient and layered architecture

2022 ◽  
Vol 319 ◽  
pp. 126140
Author(s):  
Hongyuan Zhou ◽  
Xuejian Zhang ◽  
Xiaojuan Wang ◽  
Hong Zhang ◽  
Tianyi Song
Keyword(s):  
Energy Absorption ◽  
Absorption Capacity ◽  
Foam Concrete ◽  
Energy Absorption Capacity ◽  
Layered Architecture

Experimental Analyses on Energy Absorption Property of Aluminum Honeycomb under Out-of-Plane Compression

2015 ◽  
Vol 778 ◽  
pp. 18-23
Author(s):  
Jing Hui Zhao ◽  
Jian Feng Wang ◽  
Tao Liu ◽  
Na Yang ◽  
Wen Jie Duan ◽  
...  
Keyword(s):  
Energy Absorption ◽  
Specific Energy ◽  
Absorption Capacity ◽  
Dynamic Impact ◽  
Energy Absorption Capacity ◽  
Static Compression ◽  
Specific Energy Absorption ◽  
Out Of Plane ◽  
Aluminum Honeycomb ◽  
Plane Compression

Aluminum honeycomb is a lightweight material with high strength and strong capacity of energy absorption. In order to research energy absorption characteristic of aluminum honeycomb material, quasi-static and dynamic out-of-plane compression experiments are carried out on a double-layer aluminum honeycomb impact attenuator of one FSAE racing car. Plateau stress (PS), specific load (SL), mass specific energy absorption (MSEA), volume specific energy absorption (VSEA) and other parameters of the tested aluminum honeycomb under both quasi-static and dynamic impact conditions are analyzed. The results show that the tested aluminum honeycomb impact attenuator has good energy absorption capacity to meet the collision requirements. Furthermore, under the condition of dynamic impact, the energy absorption capacity of this honeycomb improves compared with that under the condition of quasi static compression.

Crush Response of Polyurethane Foam-Filled Aluminium Tube Subjected to Axial Loading

2014 ◽  
Vol 875-877 ◽  
pp. 534-541 ◽  
Author(s):  
Chawalit Thinvongpituk ◽  
Nirut Onsalung
Keyword(s):  
Energy Absorption ◽  
Polyurethane Foam ◽  
Testing Machine ◽  
Axial Loading ◽  
Asymmetric Mode ◽  
Pu Foam ◽  
Universal Testing ◽  
Collapse Mode ◽  
Empty Tube ◽  
Foam Filled

In this paper, the experimental investigation of polyurethane (PU) foam-filled into circular aluminum tubes subjected to axial crushing was presented. The purpose of this study is to improve the energy absorption of aluminium tube under axial quasi-static load. The aluminium tube was made from the AA6063-T5 aluminium alloy tubes. Each tube was filled with polyurethane foam. The density of foam was varied from 100, 150 and 200 kg/mP3P including with empty tube. The range of diameter/thickness (D/t) ratio of tube was varied from 15-55. The specimen were tested by quasi-static axial load with crush speed of 50 mm/min using the 2,000 kN universal testing machine. The load-displacement curves while testing were recorded for calculation. The mode of collapse of each specimen was analyzed concerning on foam density and the influence of D/t ratio. The results revealed that the tube with foam-filled provided significantly increment of the energy absorption than that of the empty tube. While the density of foam and D/t ratios increase, the tendency of collapse mode is transformed from asymmetric mode to concertina mode.

Numerical and experimental investigation for enhancing the energy absorption capacity of the novel three-dimensional printed sandwich structures

2021 ◽  
pp. 146442072199749
Author(s):  
H Geramizadeh ◽  
S Dariushi ◽  
S Jedari Salami
Keyword(s):  
Energy Absorption ◽  
Sandwich Structures ◽  
Three Dimensional ◽  
Absorption Capacity ◽  
The Novel ◽  
Energy Absorption Capacity ◽  
Fused Deposition ◽  
Honeycomb Sandwich ◽  
Out Of Plane ◽  
Vertical Walls

The current study focuses on designing the optimal three-dimensional printed sandwich structures. The main goal is to improve the energy absorption capacity of the out-of-plane honeycomb sandwich beam. The novel Beta VI and Alpha VI were designed in order to achieve this aim. In the Beta VI, the connecting curves (splines) were used instead of the four diagonal walls, while the two vertical walls remained unchanged. The Alpha VI is a step forward on the Beta VI, which was promoted by filleting all angles among the vertical walls, created arcs, and face sheets. The two offered sandwich structures have not hitherto been provided in the literature. All models were designed and simulated by the CATIA and ABAQUS, respectively. The three-dimensional printer fabricated the samples by fused deposition modeling technique. The material properties were determined under tensile, compression, and three-point bending tests. The results are carried out by two methods based on experimental tests and finite element analyses that confirmed each other. The achievements provide novel insights into the determination of the adequate number of unit cells and demonstrate the energy absorption capacity of the Beta VI and Alpha VI are 23.7% and 53.9%, respectively, higher than the out-of-plane honeycomb sandwich structures.

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