Dynamic response of Nomex honeycomb sandwich panels subjected to aluminum foam projectile <scp>impact–An</scp> experimental study

Deng, Yaxin; Hu, Xiaoyu; Yang, Xiangdong; Huang, Ziqiang; Wang, Yuetong; Zhou, Chunping

doi:10.1002/pc.27151

Cited by 10 publications

(6 citation statements)

References 38 publications

(43 reference statements)

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“…25 Based on the grayscale distribution information of the speckle image before and after deformation, relevant calculations are carried out, and the displacement vector of the center point of the reference subregion is calculated by the matching algorithm so as to obtain the displacement and strain information of the measurement point. 26 It has the advantages of full-field measurement, strong anti-interference ability, and high measurement accuracy. The displacement cloud diagram for the edge portion of the back panel cannot be displayed, but it does not affect the calculation of the back panel deformation data.…”

Section: Methodsmentioning

confidence: 99%

“…Three‐dimensional digital image correlation is a non‐invasive optical technique that allows for full‐field deformation information 25 . Based on the grayscale distribution information of the speckle image before and after deformation, relevant calculations are carried out, and the displacement vector of the center point of the reference subregion is calculated by the matching algorithm so as to obtain the displacement and strain information of the measurement point 26 . It has the advantages of full‐field measurement, strong anti‐interference ability, and high measurement accuracy.…”

Section: Methodsmentioning

confidence: 99%

“…Failure mode analysis of honeycomb sandwich structures occupies an important position in impact experiments. 26 Before the hail impacts the sandwich panel, the energy of the system exists only in the form of the kinetic energy of the hail. After the collision occurs, the initial kinetic energy begins to undergo dissipation due to the breakage of the hail, the deformation of the sandwich panel, the sprouting and expansion of the damage in the composite laminate, and the buckling of the honeycomb core.…”

Section: Failure Mode Analysismentioning

confidence: 99%

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Dynamic response of GFRP/Nomex honeycomb sandwich panels subjected to multiple hail impacts – An experimental study

Sun,

Xu,

Deng

2024

Polymer Composites

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Nowadays, more and more aircraft components are made of composite sandwich structures, and ice impacts are prone to cause internal damage to composite sandwich structures, so it is crucial to study the impact of hail on composite sandwich structures. Since hail impacts may occur several times at a single point, an experimental approach was used to investigate the dynamic response of GFRP/Nomex honeycomb sandwich panels under multiple hail impacts. The dynamic response of the structure was investigated in terms of response rate and deflection‐profile curves using 3D digital image correlation methods, and the effects of impact energy, hail size, and number of impacts on the impact resistance of the honeycomb sandwich structure were explored. The results show that the dynamic response process of sandwich panels can be categorized into the ball‐and‐crown phase, the rebound phase, and the vibration phase. Under the same impact energy, the impact of small‐sized hailstones is more threatening to honeycomb sandwich panels. As the number of impacts increases, the maximum deflection value of the back panel first increases uniformly, and when the layered damage area reaches the threshold value, fiber stripping occurs, and the increment of the maximum deflection value increases significantly.Highlights Since hail impacts may occur several times in real situations, this study conducted multiple impact experiments for one impact site. The dynamic response and damage pattern of the GFRP/Nomex honeycomb sandwich panels under multiple hail impacts were also investigated. The dynamic response process of GFRP/Nomex honeycomb sandwich panels was categorized into three phases: ball‐crown stage, rebound stage, and vibration stage. With the increase of the number of impacts, fiber stripping and fiber break damage began to occur when the layered damage area of the panel reached the threshold value. The honeycomb core has three main failure modes: cell wall folds, cell wall fracture, and cell wall debonding at the TGPW interface. Small‐diameter hails pose a more significant threat of damage to honeycomb sandwich panels at the same impact energy.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Failure Mode Analysismentioning

confidence: 99%

See 1 more Smart Citation

Dynamic response of GFRP/Nomex honeycomb sandwich panels subjected to multiple hail impacts – An experimental study

Sun,

Xu,

Deng

2024

Polymer Composites

Self Cite

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“…Lightweight sandwich structures with low manufacturing costs, high specific strength and high specific stiffness are frequently used in the design of protective structures [9][10][11][12]. Zhou et al [13] experimentally studied the impact resistance of a Nomex honeycomb sandwich structure subjected to the strong dynamic loading of projectiles and revealed the deformation process and breaking mode of the sandwich plate. Patel [14] studied the blast performance of a square honeycomb sandwich panel via simulation and explored the effect of honeycomb height on performance.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of the Damage Mechanism of Multilayer Liquid-Containing Protective Structure under Combined Blast Wave and Fragment Loading

Fan,

Li,

Huang

et al. 2023

JMSE

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A multilayer liquid-containing protective structure is composed of a liquid tank, ceramic, a honeycomb sandwich and homogeneous steel. This structure has superior resistance to combined blast wave and fragment loading. Due to the relatively complicated construction of the structure, the inner damage, energy absorption and the protection characteristics of the multilayer liquid-containing protective structure need to be further studied. In this paper, a multilayer liquid-containing structural model is constructed, the dynamic response process of multilayer liquid-containing structure under combined blast wave and fragment loading is analyzed, and the damage and energy absorption characteristics of each layer structure are investigated. In addition, the effects of the charge mass and fragment form on the structural failure modes and energy absorption characteristics are discussed. The results indicate that different modes of damage occur in each layer structure. The front plate of the liquid tank sustains the most damage and absorbs the most energy, and the honeycomb sandwich absorbs the second most energy. The damage area of the front plate and the degree of compression collapse of the honeycomb sandwich increase with increasing charge mass. When the charge mass is small, the damage mode of the multilayer liquid-containing structure is greatly affected by fragments, and the damage effect of the blast wave increases with increasing charge mass. For a constant charge mass, the degree of damage to the protective structure is minimally impacted by the fragment weight, and the degree of damage can be substantially reduced by reducing the number of fragments.

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“…Macro-scale DIC is used in the picture frame test and employed to study the distinct shear failure patterns of sandwich core materials. 33,34 Deng et al 35 fabricated single-layer, doublelayer, and rubber honeycomb sandwich structures using Nomex honeycomb core material and composite panels. The surface dynamic deformation of the sandwich panels was obtained using 3D-DIC technique.…”

mentioning

confidence: 99%

Shear performance assessment of repaired honeycomb sandwich composite panels: An experimental and numerical study

et al. 2023

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This article presents an effective test method for evaluating the shear performance of repaired honeycomb sandwich panels consisting of glass fiber/epoxy matrix skin and Nomex honeycomb core. Addressing the insufficient research on the shear performance of honeycomb sandwich panels after repair in existing literature, this study conducted mechanical performance tests on the honeycomb sandwich panels before and after repair using the picture frame test method. Surface strain measurements are obtained using digital image correlation (DIC) techniques, and load–displacement and shear stress–strain curves are generated from the experimental results. The study concludes that the repair method utilized in this investigation is effective in restoring the mechanical properties of the sandwich panels. In addition, finite element models of the honeycomb sandwich panels before and after repair are established, and a comparative analysis is conducted between the experimental and simulation results. The study examines the shear modulus, ultimate load, and failure mode of the repaired and unrepaired specimens. The findings verify the feasibility of the picture frame test method for evaluating the shear performance of honeycomb sandwich panels. This study provides valuable insights into the design of shear performance repair for honeycomb sandwich panels and offers theoretical support for material recycling.

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Dynamic response of Nomex honeycomb sandwich panels subjected to aluminum foam projectile impact–An experimental study

Cited by 10 publications

References 38 publications

Dynamic response of GFRP/Nomex honeycomb sandwich panels subjected to multiple hail impacts – An experimental study

Dynamic response of GFRP/Nomex honeycomb sandwich panels subjected to multiple hail impacts – An experimental study

An Investigation of the Damage Mechanism of Multilayer Liquid-Containing Protective Structure under Combined Blast Wave and Fragment Loading

Shear performance assessment of repaired honeycomb sandwich composite panels: An experimental and numerical study

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