scholarly journals Investigation on Microstructure of Beetle Elytra and Energy Absorption Properties of Bio-Inspired Honeycomb Thin-Walled Structure under Axial Dynamic Crushing

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 667 ◽  
Author(s):  
Jianxun Du ◽  
Peng Hao
Keyword(s):  
Cell Size ◽  
Energy Absorption ◽  
Hind Wing ◽  
Clean Energy ◽  
Honeycomb Structure ◽  
Finite Element Software ◽  
Beetle Elytra ◽  
Honeycomb Sandwich ◽  
Thin Walled ◽  
Honeycomb Sandwich Structure

The beetle elytra requires not only to be lightweight to make a beetle fly easily, but also to protect its body and hind-wing from outside damage. The honeycomb sandwich structure in the beetle elytra make it meet the above requirements. In the present work, the microstructures of beetle elytra, including biology layers and thin-walled honeycombs, are observed by scanning electron microscope and discussed. A new bionic honeycomb structure (BHS) with a different hierarchy order of filling cellular structure is established. inspired by elytra internal structure. Then the energy absorbed ability of different bionic models with the different filling cell size are compared by using nonlinear finite element software LS-DYNA (Livermore Software Technology Corp., Livermore, CA, USA). Numerical results show that the absorbed energy of bionic honeycomb structures is increased obviously with the increase of the filling cell size. The findings indicate that the bionic honeycomb structure with second order has an obviously improvement over conventional structures filled with honeycombs and shows great potential for novel clean energy absorption equipment.

Ron Resch Origami Pattern Inspired Energy Absorption Structures

2018 ◽  
Vol 86 (1) ◽  
Author(s):  
Zhe Chen ◽  
Tonghao Wu ◽  
Guodong Nian ◽  
Yejie Shan ◽  
Xueya Liang ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Energy Absorption ◽  
Impact Energy ◽  
Plastic Hinge ◽  
Honeycomb Structure ◽  
Experimental Characterization ◽  
Collapse Mode ◽  
Thin Walled ◽  
Force Reduction ◽  
Absorb Impact Energy

Energy absorption structures are widely used in many scenarios. Thin-walled members have been heavily employed to absorb impact energy. This paper presents a novel, Ron Resch origami pattern inspired energy absorption structure. Experimental characterization and numerical simulations were conducted to study the energy absorption of this structure. The results show a new collapse mode in terms of energy absorption featuring multiple plastic hinge lines, which lead to the peak force reduction and larger effective stroke, as compared with the classical honeycomb structure. Overall, the Ron Resch origami-inspired structure and the classical honeycomb structure are quite complementary as energy absorption structures.

scholarly journals Research on Dynamics Stiffness of Honeycomb Sandwich Structure Door

2021 ◽  
Vol 2133 (1) ◽  
pp. 012036
Author(s):  
Xiuqi Yuan
Keyword(s):  
Sandwich Structure ◽  
High Reliability ◽  
Dynamic Stiffness ◽  
Functional Requirements ◽  
Design And Optimization ◽  
Door Opening ◽  
Finite Element Software ◽  
Honeycomb Sandwich ◽  
Calculation Results ◽  
Honeycomb Sandwich Structure

Abstract During the emergency opening of the aircraft door in the air, the door must experience a complex and harsh mechanical environment. In order to ensure the high reliability of the door, it must have sufficient dynamic stiffness. When using finite element software for static engineering analysis, the calculation results often have large deviations due to improper simplification of the motion links in the structure. Aiming at the characteristics of the honeycomb sandwich structure of a class of civil aircraft doors, a combination of topology optimization and dynamic analysis was adopted to take into account the door load and the door opening speed. The results of dynamic calculation show that when the door is opened in the air, the bending deformation during cruise is in compliance with the requirements, and the structural rigidity meets the functional requirements. The research results have important effects on the design and optimization of the stiffness performance of honeycomb sandwich doors.

Experiment and Simulation on Natural Frequency of Fiber-Paper Honeycomb Sandwich Structure Composites

2011 ◽  
Vol 101-102 ◽  
pp. 360-364 ◽  
Author(s):  
Xiao Jun Yang ◽  
Qing Shan Lan ◽  
Yu Ning Zhong
Keyword(s):  
Sandwich Structure ◽  
Optimization Design ◽  
First Order ◽  
Finite Element Software ◽  
Honeycomb Sandwich ◽  
Vibration Experiment ◽  
Paper Honeycomb ◽  
Result Analysis ◽  
Equivalent Method ◽  
Honeycomb Sandwich Structure

The theory of natural frequencies were acquired from vibration experiment, meanwhile, the first order frequencies of honeycomb sandwich structure composites were obtained by using the sandwich laminboard theory and equivalent panel theory via the finite element software ANSYS. The simulation results were compared to the experiment results to get the error of calculation of the two different equivalent methods, thereby we can select more appropriate equivalent method to ensure the veracity of the result analysis and provide a reference for the optimization design of the fiber-paper honeycomb sandwich structure composites.

Analysis and Research of Honeycomb Sandwich Structure for MicroSatellite Based on Equivalent Theory

2010 ◽  
Vol 426-427 ◽  
pp. 472-476 ◽  
Author(s):  
Kan Zheng ◽  
W.H. Liao ◽  
Y.T. Qin
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Sandwich Structure ◽  
Plate Theory ◽  
Mechanical Test ◽  
Element Analysis ◽  
Cell Library ◽  
Finite Element Software ◽  
Honeycomb Sandwich ◽  
Honeycomb Sandwich Structure

With the honeycomb sandwich structure widely used in aerospace, the research of its mechanical properties becomes especially important. All of the finite element analysis software have no corresponding cell library, so before the analysis, the honeycomb sandwich panels should be equivalent processed. The paper by taking the floor of a microsatellite as the research object, used the equivalent plate theory and sandwich plate theory for equivalent processing, then adopted the finite element software to analyze the mechanical properties of the floor under two alternative condition. By compared with analytical solution, the equivalent results were reasonable, and the two methods were basically identical. Meanwhile, the equivalent results provided the reliable basis for the satellite structure optimum design and mechanical test.

scholarly journals Micro Fracture Behavior of Composite Honeycomb Sandwich Structure

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 135
Author(s):  
Guangjian Bi ◽  
Jianping Yin ◽  
Zhijun Wang ◽  
Zijian Jia
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Fracture Energy ◽  
Energy Absorption ◽  
Sandwich Structure ◽  
Great Influence ◽  
Energy Curve ◽  
Energy Calculation ◽  
Honeycomb Sandwich ◽  
Honeycomb Sandwich Structure

To study the influence of structure size and composite forms on the mechanical properties of the composite double honeycomb sandwich structure, a composite double honeycomb sandwich structure was initially designed. The dynamic response of a composite double-layer honeycomb sandwich structure under high-speed impact was studied through theoretical analysis and numerical simulation. Ls-dyna software was used to simulate the initially designed composite structure. According to the numerical simulation results and the proposed method for calculating the fracture energy of the composite double honeycomb sandwich structure, the effects of different composite forms on the mechanical properties were analyzed. The results show that the proposed fracture energy calculation method can effectively describe the variation trend of the honeycomb structure and the micro-element fracture situation in the valid time. The fracture energy curve has a high sensitivity to cell density and material, and the strength of the top core has a great influence on the overall energy absorption. Compared with the traditional honeycomb protection structure, the energy absorption of the initially designed composite honeycomb sandwich structure was improved effectively.

scholarly journals Quasi-Static Axial Crushing Behavior of Honeycomb-Filled Thin-Walled Aluminum Tubes

2011 ◽  
Vol 5 (1) ◽  
pp. 184-193 ◽  
Author(s):  
Levent Aktay ◽  
Cem Çakıroğlu ◽  
Mustafa Güden
Keyword(s):  
Cell Size ◽  
Energy Absorption ◽  
Specific Energy ◽  
Cell Model ◽  
Deformation Mode ◽  
Wall Thickening ◽  
Specific Energy Absorption ◽  
Foam Filling ◽  
Thin Walled ◽  
Crushing Behavior

The experimental and numerical quasi-static crushing behaviors of Nomex™ honeycomb-filled thin-walled Al tubes were investigated. The honeycomb filler was modeled using a unit cell model. The numerical model and experimental results have shown that, 6.4 mm and 4.8 mm cell size honeycomb filling had no effect on the deformation mode (diamond); however 3.2 mm cell size honeycomb filling changed the deformation mode to mixed/concertina. Honeycomb filling was also shown to increase the specific energy absorption of filled tubes over that of Al tube. The specific energy absorption of honeycomb filling was further compared with those of tube wall thickening and Al closedcell foam filling.

Axial Crushing in a Novel Technique of Thin-Walled Tube

2014 ◽  
Vol 622-623 ◽  
pp. 709-716 ◽  
Author(s):  
Majid Elyasi ◽  
Amin Moradpour ◽  
Saharnaz Montazeri
Keyword(s):  
Energy Absorption ◽  
Weight Ratio ◽  
Absorption System ◽  
Absorbed Energy ◽  
Finite Element Software ◽  
Novel Technique ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
A New Technique ◽  
Novel Model

Thin-walled tubes have always considered as energy absorption systems by researchers. This paper presents a new technique for energy absorption system which is simpler than other designs in production. This novel model is a thin-walled tube with perforation. During manufacturing process, equal numbers of holes are created in rows and columns in order to increase the energy absorption ability. In this article two different workpieces with the same geometry, one with holes and the other one with grooves, are compared to validate the model in accordance with other presented ones. For this purpose, specimens were modeled in finite element software ABAQUS with the same conditions and the amount of energy absorption, the initial decay, and the weight ratio of energy absorption (SEA) were evaluated. Then results which obtained from simulation are compared with experimental ones. Results confirmed that specimens with perforation have better decay symmetry rather than ones with grooves. In addition, force absorption in workpieces with hole is as twice as ones with grooves. The amounts of absorbed energy and SEA in workpieces with perforation are 56% and 46% more than workpieces with grooves, respectively.

The effect of structural parameters on quasi-static compression performance of bi-directional trapezoid honeycomb

2021 ◽  
pp. 002199832110095
Author(s):  
Youdong Xing ◽  
Siyi Yang ◽  
Zhongfang Li ◽  
Wan Ma ◽  
Yukun An
Keyword(s):  
Cell Size ◽  
Energy Absorption ◽  
Structural Parameters ◽  
Great Influence ◽  
Honeycomb Structure ◽  
Stress Plateau ◽  
Static Compression ◽  
Compression Performance ◽  
Quasi Static Compression ◽  
Cell Thickness

A porous material –Bi-directional Trapezoid Honeycomb (BDTH) which is different from the traditional honeycomb structure, has same energy absorption properties in the Y and Z directions was studied. The structural parameters (cell size, cell thickness) have a great influence on the compression performance. 3 kinds of cell size ( a) and 4 kinds of cell thickness ( t0) totally 7 kinds of BDTH were manufactured. The quasi-static compression test was carried out with experiment and numerical simulation, and the results were obtained. The effects of material deformation modes and energy absorption are analyzed. Next, based on Gibson-Ashby theory, the relationship between density, initial peak stress, plateau stress, densification strain and the ratio of t0/a were deduced.

Sign in / Sign up

Export Citation Format

Share Document