Crashworthiness analysis and multiobjective optimization of bio-inspired sandwich structure under impact load

Abstract In order to research the impact mechanical response characteristics of the bio-inspired composite sandwich structure, the hemispherical impactor is preloaded with different energy to impact bio-inspired and conventional composite sandwich structure, the stress distribution and dynamic response characteristics of composite sandwich structure under impact load are studied. The results show that the main damage of the upper panel is fiber shear fracture, while crushing fracture for the core, and the main damage of the lower panel is fiber tensile tearing under different impact load. The bio-inspired composite sandwich structure shows better impact resistance in terms of damage depth and maximum impact load under the same impact energy. From the perspective of energy consumption, the bio-inspired structure absorbed more energy than conventional structure under high energy impact.

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An Integrated Approach for Optimization of Honeycomb Sandwich Structure under Impact Load

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.152-154.1717 ◽

2012 ◽

Vol 152-154 ◽

pp. 1717-1722

Author(s):

Hamdan Ajmal Khan ◽

Faizan Habib Vance ◽

Asif Israr ◽

Tanzeel Ur Rehman

Keyword(s):

Genetic Algorithm ◽

Quadratic Programming ◽

Sequential Quadratic Programming ◽

Sandwich Structure ◽

Impact Load ◽

Sheet Thickness ◽

Integrated Approach ◽

Buckling Stress ◽

Core Height ◽

Honeycomb Sandwich Structure

In this paper weight optimization of sandwich structure consisting of a honeycomb core sandwiched between two layers is presented through the use of Sequential Quadratic Programming & Genetic Algorithm by constraining of certain parameters such as buckling stress, cost and geometry. The variables to be optimized are core height, face sheet thickness and cell thickness for an effective design and better performance of the entire structural system. Sequential Quadratic Programming in Matlaband Genetic Algorithm technique with high robustness is performed and comparison between the two results is made for early convergence of the variables to be optimized. In this way, the structure could easily be monitored for any volatility, and avoid probable failure by employing proper remedial action.

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Crashworthiness Analysis and Optimization of Thin-Walled Square Tube with Pyramidal Ripples Based on Mechanics Properties

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.625.69 ◽

2012 ◽

Vol 625 ◽

pp. 69-74

Author(s):

Xiao Guang Hu ◽

Jing Bo Yang

Keyword(s):

Kinetic Energy ◽

Impact Load ◽

Explicit Finite Element ◽

Surface Method ◽

Finite Element Technology ◽

Thin Walled ◽

Crashworthiness Analysis ◽

Energy Absorbing ◽

Impact Kinetic Energy ◽

Load Simulation

Thin-walled structure absorbs most impact kinetic energy during collision accident,and they are widely used as energy-absorbing element. In order to improve crashworthiness of them, regular pyramidal ripple is added on the thin-walled square tube’s surface. Explicit finite element technology is applied to simulate the behavior of the tube under axial impact load. Simulation data was delt with by Response Surface Method to form a function of variables and response,and the new structure was optimized. Research results show that, the thin-walled square tube with pyramidal ripples can improve controllable of structure deformation obviously and Optimized structure can absorb and dissipate much more impact kinetic energy.

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Arrangement Optimization and Crashworthiness Analysis of B-Pilla Solder Joint Based on Collision Safety

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.315.90 ◽

2021 ◽

Vol 315 ◽

pp. 90-95

Author(s):

Dong Wen ◽

Wang Hua ◽

Hai Feng Yang ◽

Liu Tao ◽

Qiu Yue Jiang

Keyword(s):

Solder Joint ◽

Impact Load ◽

Middle Part ◽

The Body ◽

Side Impact ◽

Collision Safety ◽

Class B ◽

Torsional Frequency ◽

Crashworthiness Analysis ◽

The Impact

Through hyperworks and Lsdyna, the side impact simulation of the vehicle model with Q&P980 class B-pilla is carried out. The middle part of B-pillar is the main part to bear the impact load, which corresponds to the occupant's chest and abdomen. The invasive displacement and the speed are large and the change trend is basically the same. After the optimization of the B-pillar weld solder joint layout, the number of solder joints was reduced by 23.61%, the structural static stiffness and the first-order torsional frequency were improved, the collision performance remained basically unchanged, and the body assembly cost was reduced.

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Crashworthiness analysis and multiobjective optimization for circular tubes with functionally graded thickness under multiple loading angles

Advances in Mechanical Engineering ◽

10.1177/1687814017696660 ◽

2017 ◽

Vol 9 (4) ◽

pp. 168781401769666 ◽

Cited By ~ 7

Author(s):

Shuguang Yao ◽

Yi Xing ◽

Kai Zhao

Keyword(s):

Multiobjective Optimization ◽

Functionally Graded ◽

Circular Tubes ◽

Multiple Loading ◽

Crashworthiness Analysis ◽

Graded Thickness

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Crashworthiness Analysis of Octagonal-Inner Double Tube with different thickness under Off-Axis Oblique Load

International Journal of Mechanics ◽

10.46300/9104.2020.14.29 ◽

2020 ◽

Vol 14 ◽

Keyword(s):

Impact Load ◽

Rigid Wall ◽

Oblique Impact ◽

Element Analysis ◽

Frontal Crash ◽

Moving Wall ◽

Oblique Loading ◽

Crashworthiness Analysis ◽

Oblique Load ◽

Different Thickness

The crash tube is one of the important parts to reduce the effects of accidents. The design of crash tube only watches the frontal crash, but oblique crash might affect the passengers. Besides, Lack of oblique-loading researches in crashworthiness becomes causes to analyze crash tubes more. This paper aims to study crashworthiness performance of octagonal-inner double tubes under off-axis oblique impact load (0°, 10°, 20°, and 30°). The tubes have been connected with two walls, top wall as moving wall and a bottom wall as rigid wall underl different load angles. The tubes were made from Aluminum Alloy and consisted of a circular-outer tube and an octagonal-inner tube. The crashworthiness parameters of absorption of specific energy (SEA), maximum collapse force (Fmax) and efficiency of crush force (CFE) were obtained for all the structures. In order to get the value of parameters, the method of finite element analysis was used. The effects of different thickness of 1 mm, 2 mm, 3 mm and 4 mm and various oblique were studied. Based on numerical results, structures of 4 mm thickness were the greatest SEA of 26.39 kJ/kg among other thickness of structures. In addition, the value of energy absorption for tubes obliquely loaded decreased for all the size of thickness structures. Finally, this structure can be considered as crash box of vehicle in future

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Imaging magnetic microstructure with SEMPA

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010015099x ◽

1993 ◽

Vol 51 ◽

pp. 1032-1033

Author(s):

M. H. Kelley ◽

J. Unguris ◽

R. J. Celotta ◽

D. T. Pierce

Keyword(s):

Electron Microscopy ◽

Thin Films ◽

Scanning Electron Microscopy ◽

Sandwich Structure ◽

Magnetic Coupling ◽

Polarization Analysis ◽

Secondary Electrons ◽

Magnetic Microstructure ◽

Escape Depth ◽

Scanning Electron

By measuring the spin polarization of secondary electrons generated in a scanning electron microscope, scanning electron microscopy with polarization analysis (SEMPA) can directly image the magnitude and direction of a material’s magnetization. Because the escape depth of the secondaries is only on the order of 1 nm, SEMPA is especially well-suited for investigating the magnetization of ultra-thin films and surfaces. We have exploited this feature of SEMPA to study the magnetic microstrcture and magnetic coupling in ferromagnetic multilayers where the layers may only be a few atomic layers thick. For example, we have measured the magnetic coupling in Fe/Cr/Fe(100) and Fe/Ag/Fe(100) trilayers and have found that the coupling oscillates between ferromagnetic and antiferromagnetic as a function of the Cr or Ag spacer thickness.The SEMPA apparatus has been described in detail elsewhere. The sample consisted of a magnetic sandwich structure with a wedge-shaped interlayer as shown in Fig. 1.

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Enhanced performance of supercapacitors by constructing a “mini parallel-plate capacitor” in an electrode with high dielectric constant materials

Journal of Materials Chemistry A ◽

10.1039/d0ta04364h ◽

2020 ◽

Vol 8 (32) ◽

pp. 16661-16668

Author(s):

Huayao Tu ◽

Shouzhi Wang ◽

Hehe Jiang ◽

Zhenyan Liang ◽

Dong Shi ◽

...

Keyword(s):

Dielectric Constant ◽

Carbon Fiber ◽

Parallel Plate ◽

Sandwich Structure ◽

High Dielectric Constant ◽

Parallel Plate Capacitor ◽

Plate Capacitor ◽

Fiber Metal ◽

High Dielectric ◽

Mini Plate

The carbon fiber/metal oxide/metal oxynitride layer sandwich structure is constructed in the electrode to form a mini-plate capacitor. High dielectric constant metal oxides act as dielectric to increase their capacitance.

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