Dynamic response of sandwich structures with graded auxetic honeycomb cores under blast loading

Jin, Xiaochao; Wang, Zhi Hua; Ning, Jianguo; Xiao, Gesheng; Liu, Erqiang; Shu, Xuefeng

doi:10.1016/j.compositesb.2016.09.037

Cited by 218 publications

(59 citation statements)

References 43 publications

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“…The cores' failure was found to change from compressive to shear once the impulse exceeds a threshold. Furthermore, an innovative panel with a honeycomb core design was developed numerically and examined by Jin et al [9]. The author achieved an enhancement in the blast mitigation characteristics.…”

Section: Of 18mentioning

confidence: 99%

Study of Mild Steel Sandwich Structure Energy Absorption Performance Subjected to Localized Impulsive Loading

2020

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Extensive research focus had been given to sacrificial sandwich panels to mitigate the effects of blast loads. This is due to their ability to distribute the load and absorb a significant portion of the blast energy. This paper studies the behavior of sacrificial sandwich mild steel panels of axially oriented octagonal tapered tubular cores subjected to near-field impulsive blast. The deformation behavior and several assessment parameters consisting of the peak force, stroke efficiency, energy absorption and core efficiency were investigated using validated finite element analysis. The developed deformation modes were mainly influenced by the top plate and tube thickness. Tubes of a 5° taper performed unfavorably, exhibiting increased peak force and lower energy absorption. Panels of top plate thickness of 4 mm exhibited higher stroke efficiency as compared to panels of lower thickness. The top plate and tube thickness significantly affected energy absorption. An increase of 73.5% in core efficiency was observed in thick-plate panels as compared to thin-plate ones.

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Section: Of 18mentioning

confidence: 99%

Study of Mild Steel Sandwich Structure Energy Absorption Performance Subjected to Localized Impulsive Loading

2020

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“…Zhang et al [14] discussed the influences of different cell wall aspect ratios and cell-wall angles of auxetic re-entrant honeycombs, and confirmed that plateau stresses are related to impact velocities. Jin et al [15] systematically analyzed the dynamic properties and blast resistance of sandwich structure with auxetic re-entrant honeycomb cores under blast loading by using the LS-DYNA. Qi et al [16] found that a combination of the steel plate and an auxetic sandwich panel has a higher specific energy absorption than the conventional honeycomb panels with the same size.…”

Section: Introductionmentioning

confidence: 99%

In-plane crashworthiness of re-entrant hierarchical honeycombs with negative Poisson’s ratio

Tan

et al. 2019

Composite Structures

148

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Both auxetic structures and hierarchical honeycombs are marked with lightweight and excellent mechanical properties. Here, we combine the characteristics of auxetic structures and hierarchical honeycombs, and propose two re-entrant hierarchical honeycombs constructed by replacing the cell walls of re-entrant honeycombs with regular hexagon substructure (RHH) and equilateral triangle substructure (RHT). The honeycombs are subjected to in-plane impact in order to investigate the crashworthiness by using the commercial software LS-DYNA. The plateau stress of RHH and RHT in x and y directions are derived by a two-scale method. The results from numerical simulation indicate that the specific energy absorption of RHT and RHH is improved by up to 292% and 105%. RHT and RHH improve the mean crushing force value by 298%, 108% respectively compared with the classic re-entrant honeycomb (RH) under quasi-static loading at stress plateau region. The RHT and RHH still have the characteristic of negative Poisson's ratio. Additionally, the parametric studies are further carried out to investigate the effects of impact velocities and relative densities on crashworthiness. All the findings of this study indicate that the proposed two hierarchical honeycombs exhibit an improved crushing performance, and RHT provides the highest energy absorption capacity among all specimens.

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“…The steel panel was modelled using a plastic kinematic material model that ignored the effect of thermal changes due to the limitation of material data [55]. This model is also used by Jin to model his plate [43]. A plastic kinematic model is acceptable since the lack of stress-strain data.…”

Section: Materials Modelmentioning

confidence: 99%

“…The idea of using a core sandwich material as a blast protector is not new. Several numerical and analytical studies of sandwich structure responses subjected to impulse loading have been conducted [40][41][42][43][44][45][46]. The studies have varied materials, panel thickness, or panel configuration.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of auxetic sandwich panels on 160 grams of PE4 blast loading

Arifurrahman

Critchley

Horsfall

2020

Jnl of Sandwich Structures & Materials

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Mines, specifically as Anti-Tank (AT) mines are a significant threat for defence vehicles. While approaches such as v-shaped hulls are currently used to deflect the blast products from such threats, such a solution is not always usable when hull standoff is limited. As such the development of a low profile, energy absorbing solution is desirable. One approach that has potential to achieve these requirements are sandwich panels. While sandwich panel cores can be constructed from various materials, one material of particular interest are auxetics. Auxetic are materials that exhibit a negative Poisson’s ratio. This material has potential to be an efficient an impact energy absorber by increasing stiffness at local deformation by gathering mass at the impact location. This study investigates the effectiveness of novel auxetic core infills alongside three other panel types (monolithic, air gap, polymer foam sandwich) against buried charges. 160 grams of PE4 were buried in 100 mm depth and 500 mm stand off the target. Laser and High Speed Video (HSV) system were used to capture the deflection-time profile and load cell sensors were used to record the loading profile received by the panels. Experimental works were compared with numerical model. Explicit model were generated in LSDYNA software as ‘initial impulse mine’ keyword. The result found that the auxetic and foam core panels were effective in reducing peak structural loading and impulse by up to 33% and 34% respectively. Air-filled panels were the most effective to reduce the deflection of the rear of the plate, however variation between capture methods (HSV and Laser system) were reported, while numerical modelling provided comparable plate deflections responses. When normalised against panel weight, the air filled panels were experimentally the most efficient per unit mass system with the auxetics being the least effective.

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Dynamic response of sandwich structures with graded auxetic honeycomb cores under blast loading

Cited by 218 publications

References 43 publications

Study of Mild Steel Sandwich Structure Energy Absorption Performance Subjected to Localized Impulsive Loading

Study of Mild Steel Sandwich Structure Energy Absorption Performance Subjected to Localized Impulsive Loading

In-plane crashworthiness of re-entrant hierarchical honeycombs with negative Poisson’s ratio

Experimental and numerical study of auxetic sandwich panels on 160 grams of PE4 blast loading

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