A theoretical model of honeycomb material arresting system for aircrafts

Xing, Yun; Yang, Xianfeng; Yang, Jinling; Sun, Yuxin

doi:10.1016/j.apm.2017.04.006

Cited by 22 publications

(3 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As an aircraft travels through an EMAS bed, the interaction between the tires and the arrestor interface induces vertical and drag forces on the landing gear (11). The material directly underneath the tires is compacted, allowing for constant stress at increasing strains (12).…”

Section: Quasi-static Indentationmentioning

confidence: 99%

Optimization of Cellular Concrete Microstructure for Improved Impact Resistance

Clark

Lange

2021

Transportation Research Record: Journal of the Transportation R

View full text Add to dashboard Cite

Engineered material arresting system (EMAS) is a cellular concrete material currently used as passive aircraft arresting system at airports around the U.S.A. and abroad. Its cellular structure crushes on impact, helping to absorb energy and create drag resistance. Energy absorbed during crushing is defined by the load–deformation response curve, in which a plateau is indicative of crushing behavior at a near-constant load. At the microstructural level, the energy absorbed from crushing is a combination of elastic buckling, plastic yield, and brittle fracture of the cellular microstructure. Therefore, optimization of the cellular structure (e.g., bubble size and distribution) is paramount to the overall performance of these systems. This study makes use of microstructural investigations, quasi-static indentation, and drop weight testing to investigate the performance of cellular concrete with varied microstructures. The results show that, while density (air content) has been considered the main predictor of overall performance, the nature of the cellular structure created by the use of different foaming agents can be a useful design tool. This adds another critical consideration in the design of impact-resistant infrastructure. Given this finding, a new set of design guidelines are presented in this paper. This work aims to inform better design of impact-resistant infrastructure by identifying cellular concrete microstructures that lead to optimal energy absorption in low-velocity impact events, such as aircraft overruns.

show abstract

Section: Quasi-static Indentationmentioning

confidence: 99%

Optimization of Cellular Concrete Microstructure for Improved Impact Resistance

Clark

Lange

2021

Transportation Research Record: Journal of the Transportation R

View full text Add to dashboard Cite

show abstract

“…The engineered material arresting system (EMAS) installed at the end of runways in airports is essential to reduce the risks of aircraft speeding out of the runway. , The core engineered materials in EMAS, which should involve the features of high energy absorption, reliability, and stability, must be sacrificed to prevent the crashing of an aircraft. As illustrated in Figure a, a Boeing 737 airplane was stopped in less than 300 m by an in situ arresting test of EMAS (Civil Aviation Administration of China (CAAC), Tianjin Binhai Int.…”

Section: Introductionmentioning

confidence: 99%

Structure of Industrial Sacrificial Fragile Cementitious Foams

et al. 2022

View full text Add to dashboard Cite

Sacrificial fragile cementitious foams (SFCFs) act as a core material of the engineered material arresting system (EMAS) installed in airports to enhance the safe take-offs and landings of aircrafts. The foam structures and foaming mechanisms that greatly impact the collapse strength, specific energy, and arresting efficiency of SFCFs, however, have not been fully addressed. Herein, the engineering properties, chemical characteristics, and pore–skeleton structures of three batches of industrial SFCFs were experimentally investigated. Penetration tests showed significant differences in collapse strength and specific energy among the SFCFs with a similar density. Three-dimensional (3D) pore–skeleton structures were resolved by microfocused X-ray computed tomography. The pore–skeleton anisotropy was investigated to uncover the stages of differences in the SFCFs’ engineering properties. The results demonstrate that the pore anisotropy rather than the porosity dominates the collapse of cementitious foams. Viscosity-associated nucleation and growth mechanisms were proposed to account for the featured pore–skeleton structures of the SFCFs. The findings would contribute to better pore structure controls of SFCFs toward the improved quality of EMAS.

show abstract

“…Cellular structures, in the form of composite materials, are a classic route to obtain high values of static and dynamic specific mechanical properties [1,2]. This characteristic has always been advantageous in many fields and applications, from diverse areas such as packaging, the transportation industry (e.g., railway [3][4][5] and aeronautic [6][7][8]), and medical implants [9][10][11]. This class of materials, when using a metallic matrix, are classically manufactured by foam blowing agents/gas injection [12][13][14][15][16][17] and casting with space holders with leachable [18][19][20][21][22] or non-leachable [23][24][25] particles.…”

Section: Introductionmentioning

confidence: 99%

Thin-Rib and High Aspect Ratio Non-Stochastic Scaffolds by Vacuum Assisted Investment Casting

Carneiro¹,

Puga

Peixinho³

et al. 2019

JMMP

View full text Add to dashboard Cite

Cellular structures are a classic route to obtain high values of specific mechanical properties. This characteristic is advantageous in many fields, from diverse areas such as packaging, transportation industry, and/or medical implants. Recent studies have employed additive manufacturing and casting techniques to obtain non-stochastic cellular materials, thus, generating an in situ control on the overall mechanical properties. Both techniques display issues, such as lack of control at a microstructural level in the additive manufacturing of metallic alloys and the difficulty in casting thin-rib cellular materials (e.g., metallic scaffolds). To mitigate these problems, this study shows a combination of additive manufacturing and investment casting, in which vacuum is used to assist the filling of thin-rib and high aspect-ratio scaffolds. The process uses 3D printing to produce the investment model. Even though, vacuum is fundamental to allow a complete filling of the models, the temperatures of both mold and casting are important to the success of this route. Minimum temperatures of 250 °C for the mold and 700 °C for the casting must be used to guarantee a successful casting. Cast samples shown small deviations relatively to the initial CAD model, mainly small expansions in rib length and contraction in rib thickness may be observed. However, these changes may be advantageous to obtain higher values of aspect ratio in the final samples.

show abstract

A theoretical model of honeycomb material arresting system for aircrafts

Cited by 22 publications

References 20 publications

Optimization of Cellular Concrete Microstructure for Improved Impact Resistance

Optimization of Cellular Concrete Microstructure for Improved Impact Resistance

Structure of Industrial Sacrificial Fragile Cementitious Foams

Thin-Rib and High Aspect Ratio Non-Stochastic Scaffolds by Vacuum Assisted Investment Casting

Contact Info

Product

Resources

About