Influence of lightning strikes on the structural performance of Ni-glass/epoxy radar-absorbing structures

Jang, Minsu; Choi, Jae-Hun; Jang, Woo-Hyeok; Nam, Young‐Woo; Kim, Chun-Gon

doi:10.1016/j.compstruct.2020.112301

Cited by 9 publications

(2 citation statements)

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“…This material system and cure cycle are similar to those reported in previous experimental studies. [18,21,26] Laminates with four different stacking sequences were fabricated in accordance with their intended characterization tests: [45 /À45 ] 4S (in-plane shear), [0 ] 16 , [90 ] 16 (inplane tension), and [0 ] 84 (through-thickness properties). Neat epoxy resin plates were also produced in order to test the matrix's elastic and thermal properties.…”

Section: Materials and Fabricationmentioning

confidence: 99%

“…[19,22] Ni-coated carbon-fiber polymer composites have been previously used in electrothermal heating, thereby demonstrating the potential for use in aircraft de-icing systems. [23][24][25] Additionally, the performance of nickelcoated glass-fiber [26] and carbon-fiber [27] polymer composites when struck by lightning has been investigated; initial results show that Ni-coated glass-fibers alone are insufficient to offer adequate lightning strike protection. Chakravarthi et al [28] reported that the addition of 4 wt% Ni-coated single-walled carbon nanotube (CNT) filler to carbon-bismaleimide (BMI) polymer composite reduced electrical resistivity tenfold and demonstrated by simulation a resulting reduced lightning strike damage area.…”

Section: Introductionmentioning

confidence: 99%

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Thermal cycling of strained nickel‐coated glass‐epoxy composite laminates: Effects on macro mechanical and fiber‐matrix interface properties

et al. 2022

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Nickel coating of reinforcing fibers via electroless plating can provide superior properties to polymer composites, particularly for radar stealth, although its effect on thermomechanical properties and thermal cycling response are relatively unverified. Thermal cycling of strained nickel‐coated glass fiber epoxy laminates was performed to evaluate its effect through in‐plane shear mechanical testing and fiber‐matrix interface region microscopic observations. Laminates were subjected to 4000 cycles of thermal conditioning (regular and strained). Subsequent in‐plane shear tensile tests revealed a ~10% increase in their ultimate shear strength, which was credited to polymer relaxation and increased plastic energy storage capacity. Atomic force microscopy in force modulation mode showed the most significant fiber‐matrix interface region changes for strained thermal cycled specimens, which we attribute to their higher stress during conditioning and plastic deformation. A relatively short fiber‐matrix interface region length was observed, which we attribute to the lower surface energy of Ni‐glass fiber. Thermomechanical analysis (TMA) revealed a glass‐transition temperature range of 71–110°C, and coefficients of thermal expansion (CTE) were evaluated for several laminate configurations.

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Section: Materials and Fabricationmentioning

confidence: 99%