Mechanical and energy absorption properties of the composite XX-type lattice sandwich structure

Abstract This article proposed an innovative composite sandwich structure reinforced with trapezoidal latticed webs with angles of 45°, 60° and 75°. Four specimens were conducted according to quasi-static compression methods to investigate the compressive behavior of the novel composite structures. The experimental results indicated that the specimen with 45° trapezoidal latticed webs showed the most excellent energy absorption ability, which was about 2.5 times of the structures with vertical latticed webs. Compared to the traditional composite sandwich structure, the elastic displacement and ultimate load-bearing capacity of the specimen with 45° trapezoidal latticed webs were increased by 624.1 and 439.8%, respectively. Numerical analysis of the composite sandwich structures was carried out by using a nonlinear explicit finite element (FE) software ANSYS/LS-DYNA. The influence of the thickness of face sheets, lattice webs and foam density on the elastic ultimate load-bearing capacity, the elastic displacement and initial stiffness was analyzed. This innovative composite bumper device for bridge pier protection against ship collision was simulated to verify its performance. The results showed that the peak impact force of the composite anti-collision device with 45° trapezoidal latticed webs would be reduced by 17.3%, and the time duration will be prolonged by about 31.1%.

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Parametric Analysis on Landing Gear Strut Friction of Light Aircraft for Touchdown Performance

Applied Sciences ◽

10.3390/app11125445 ◽

2021 ◽

Vol 11 (12) ◽

pp. 5445

Author(s):

Shengyong Gan ◽

Xingbo Fang ◽

Xiaohui Wei

Keyword(s):

Response Surface ◽

Energy Absorption ◽

Landing Gear ◽

Surface Model ◽

Absorption Properties ◽

Surface Method ◽

Design Variables ◽

Landing Impact ◽

Landing Response ◽

Parametric Studies

The aim of this paper is to obtain the strut friction–touchdown performance relation for designing the parameters involving the strut friction of the landing gear in a light aircraft. The numerical model of the landing gear is validated by drop test of single half-axle landing gear, which is used to obtain the energy absorption properties of strut friction in the landing process. Parametric studies are conducted using the response surface method. Based on the design of the experiment results and response surface functions, the sensitivity analysis of the design variables is implemented. Furthermore, a multi-objective optimization is carried out for good touchdown performance. The results show that the proportion of energy absorption of friction load accounts for more than 35% of the total landing impact energy. The response surface model characterizes well for the landing response, with a minimum fitting accuracy of 99.52%. The most sensitive variables for the four landing responses are the lower bearing width and the wheel moment of inertia. Moreover, the max overloading of sprung mass in LC-1 decreases by 4.84% after design optimization, which illustrates that the method of analysis and optimization on the strut friction of landing gear is efficient for improving the aircraft touchdown performance.

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Mechanical properties and energy absorption capabilities of aluminium foam sandwich structure subjected to low-velocity impact

Construction and Building Materials ◽

10.1016/j.conbuildmat.2020.121996 ◽

2021 ◽

Vol 273 ◽

pp. 121996

Author(s):

Ying Zhao ◽

Zhaohan Yang ◽

Tianlai Yu ◽

Dabo Xin

Keyword(s):

Mechanical Properties ◽

Energy Absorption ◽

Sandwich Structure ◽

Aluminium Foam ◽

Low Velocity Impact ◽

Low Velocity ◽

Velocity Impact

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Factors Affecting the Compression and Energy Absorption Properties of Small-Sized Thin-Walled Metal Tubes

International Journal of Aerospace Engineering ◽

10.1155/2020/6135925 ◽

2020 ◽

Vol 2020 ◽

pp. 1-12

Author(s):

Xiaoqin Hao ◽

Jia Yu ◽

Weidong He ◽

Yi Jiang

Keyword(s):

Energy Absorption ◽

Simulation Models ◽

Simulation Method ◽

Engineering Practice ◽

Small Ring ◽

Metal Tube ◽

Absorption Properties ◽

Factors Affecting ◽

Thin Walled ◽

Hollow Metal

To solve the problem of the effective cushioning of fast-moving mechanical components in small ring-shaped spaces, the factors affecting the compression and energy absorption properties of small-sized hollow metal tubes were studied. Simulation models were constructed to analyse the influences of tube diameter, wall thickness, relative position, and number of stacked components on the compression and energy absorption properties. The correctness of the simulation method and its output were verified by experiments, which proved the effectiveness of compression and energy absorption properties of small-sized thin-walled metal tubes. The research provides support for the application of metal tube buffers in armament launch technology and engineering practice.

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Energy Absorption Properties of FRP tube under Commission Load

10.4271/2003-01-2778 ◽

2003 ◽

Author(s):

Atsushi Yokoyama ◽

Tamotsu Nakatani ◽

Motoharu Tateishi ◽

Akihiko Gotoh

Keyword(s):

Energy Absorption ◽

Absorption Properties ◽

Frp Tube

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Correlation between Zirconium Addition and Compressive Properties of AZ31 Mg Alloy Foams

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.121-126.75 ◽

2011 ◽

Vol 121-126 ◽

pp. 75-79

Author(s):

Bo Young Hur ◽

Rui Zhao

Keyword(s):

Mechanical Properties ◽

Energy Absorption ◽

Mg Alloy ◽

Compressive Properties ◽

Absorption Properties ◽

Compression Behavior ◽

Foaming Agent ◽

Az31 Mg Alloy ◽

Absorption Characteristics ◽

Zirconium Addition

The compressive behaviors of AZ31-Zr foams using Ca particles as thickening agent and CaCO3 powder as foaming agent were investigated in this study. The porosity was about 48.7%~72.9%, pore size was between 0.43~0.97 mm, and homogenous pore structures were obtained. Mechanical properties of AZ31 Mg alloy foams were investigated by means of UTM. The cellular AZ31 Mg foams possess superior comprehensive mechanical properties. The energy absorption characteristics and the effects of compression behavior on the energy absorption properties for the cellular AZ31 Mg foams have been investigated and discussed. The results show that with the addition of Zr, the Mg alloy foam has the highest energy absorption value of 16.26 MJ/m3 and the hardness value of 81.8 HV, which is much higher than that of the foams fabricated without Zr.

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