The effect of curvature on the impact response of foam-based sandwich composite panels

Yurddaşkal, Melis; Baba, Buket Okutan

doi:10.12989/scs.2016.20.5.983

Cited by 12 publications

(13 citation statements)

References 17 publications

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“…Thickness of the core was 15mm similar to the experimental work [16]. Curvature of FE models are constant at 160mm.…”

Section: Constant Stiffness Core Modelmentioning

confidence: 75%

“…For this study, a foam core plate with glass/epoxy face-sheets are considered. Material properties for the glass/epoxy facesheets and impactor are presented in [16]. The radius of curvature of the panel 160mm.…”

Section: Parametric Studiesmentioning

confidence: 99%

“…A numerical finite element model of the curved sandwich plate is developed in finite element program, LS-DYNA. The main aim of this numerical model is to validate the analytical model and compare with available experimental data from impact tests performed by Yurddaskal and Baba [16] for a curved sandwich plate. The facesheets were made using glass/epoxy and modelled using 4-node 1.5mm shell elements with Belytschko-Tsay element formulation with four integration points to define the four layers in the facesheet.…”

Section: Validation With Finite Element Modellingmentioning

confidence: 99%

“…According to their results denting depends on the kinetic energy, compliance and nose shape of the colliding body as well as the compliance and mass density of the sandwich panel. Yurddaskal and Baba [16] studied curvature effects on impact response of sandwich panels. They discovered that contact force increases as impact energy increases for flat and curved plates and that curved plates exhibit more damage at the upper face-sheet.…”

Section: Introductionmentioning

confidence: 99%

“…Validation of the developed analytical modelsThe present analytical model is first validated with experimental work performed by Yurddaskal and Baba[16] performed experimental studies on low velocity impact response of foam based curved sandwich plates. In the calculation of the effective dynamic global stiffness, of the panel, the equations for the simply supported boundary conditions were used.…”

mentioning

confidence: 97%

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Effect of variable core stiffness on the impact response of curved sandwich plates

Arachchige

Ghasemnejad

2018

Composite Structures

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An extensive analytical model to determine behaviour of curved sandwich plates with variable stiffness cores and face-sheets under low velocity impact with foam core is presented in this paper. A developed method is introduced to determine effective dynamic stiffness of the facesheets and core with variable stiffness. A modified spring-mass-dashpot model was used to obtain the contact force function related to effective dynamic stiffness and effective dynamic frequency to determine the contact force histories by impact of a hemispherical-nose impactor. A parametric study was also performed to understand the effects of several factors such as impactor velocity, face-sheet thickness, core thickness (constant and variable stiffness), layup orientation and curvature on the contact force histories of curved sandwich plates. Different geometries of curved sandwich plates are analysed to study their performance under impact loading. Numerical analysis was performed in LS-DYNA to further validate with the developed analytical models.

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“…Thickness of the core was 15mm similar to the experimental work [16]. Curvature of FE models are constant at 160mm.…”

Section: Constant Stiffness Core Modelmentioning

confidence: 75%

Section: Parametric Studiesmentioning

confidence: 99%

Section: Validation With Finite Element Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 97%

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Effect of variable core stiffness on the impact response of curved sandwich plates

Arachchige

Ghasemnejad

2018

Composite Structures

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Curved grid‐scored foam core sandwich composites under low‐velocity impact loads: Effects of curvature, stacking sequence, and core finishing

Balıkoğlu

2023

Polymer Composites

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The objective of this paper is to experimentally investigate how material and geometric parameters, including face sheet layup, curvature, and core finishing, affect the contact force‐displacement behavior, absorbed energy, and damage modes of curved sandwich composites with grid‐scored foam under low‐velocity impact loads. An instrumented drop‐weight testing machine with a hemispherical impactor was used to perform low‐velocity impact tests at different energy levels. Angled‐ply stacking had the maximum contact force and impact resistance for low curvature radii. In the event of penetration, the impact energy absorption of all curved sandwich panels increased as the curvature increased. The core finishing influenced the contact forces of the curved and flat sandwich panels but not the penetration energy. The curvature and face sheet layups affected the delamination size and pattern. Angle‐ply and cross‐ply face sheets with the smallest and maximum radius of curvature, respectively, decreased penetration depth. The resin‐filled channels reduced foam cell impact damage and face‐core debonding. LVI penetration resistance was found to be highest for angle‐ply stacking and knife‐cut foam at small curvature radii. The proposed research will also provide naval designers with valuable insight into the impact response of sandwich structures used in curved parts of the hull and deck.Highlights The effect of curvature on the LVI responses varied due to face sheet layups. Core finishing affected contact forces, but not the absorbed energy. Curvature and face sheet layups affected the damage modes. Resin‐filled channels limited damage area and acted as stoppers for debonding.

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Preparation of melamine borate coated red phosphorus microcapsules and use of zinc borate as synergistic flame retardant in polyethylene

Liu

Zeng

et al. 2022

Vinyl Additive Technology

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Microcapsules (Mic-MBP) based on the melamine borate coated red phosphorus (RP) were prepared, and its synergistic flame retardant with zinc borate (ZB) on polyethylene (PE) was investigated. The flame retardant properties of the PE/20% Mic-MBP/10%ZB were superior to that of PE/20%RP/10%ZB. Furthermore, the limiting oxygen index of PE/20%Mic-MBP/10%ZB was 25.2%, and PE/20%Mic-MBP/10%ZB reached the UL-94V-0 rating. Compared with PE, the peak heat release rate (pk-HRR), total heat release (THR) and average effective heat of combustion (av-EHC) of PE/20%Mic-MBP/10%ZB had decreased. In addition, the flame retardant mechanism was investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), pyrolysis-gas chromatography-mass spectrometry (PY-GC-MS) and Fourier transform infrared spectroscopy (FT-IR). The results showed that the residual char of PE/20%Mic-MBP/10%ZB had thermal stability, and the formation of phosphorus free radicals and nonflammable gases effectively reduced the burning intensity of the gas phase. It indicated that Mic-MBP/ZB showed a condensed and gas phase flame retardant effect.

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The effect of curvature on the impact response of foam-based sandwich composite panels

Cited by 12 publications

References 17 publications

Effect of variable core stiffness on the impact response of curved sandwich plates

Effect of variable core stiffness on the impact response of curved sandwich plates

Curved grid‐scored foam core sandwich composites under low‐velocity impact loads: Effects of curvature, stacking sequence, and core finishing

Preparation of melamine borate coated red phosphorus microcapsules and use of zinc borate as synergistic flame retardant in polyethylene

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