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Dynamic impact behavior of syntactic foam core sandwich composites
Journal of Composite Materials ( IF 2.9 ) Pub Date : 2019-11-10 , DOI: 10.1177/0021998319885000
P Breunig 1 , V Damodaran 1 , K Shahapurkar 2 , S Waddar 3 , M Doddamani 3 , P Jeyaraj 3 , P Prabhakar 1
Affiliation  

Sandwich composites and syntactic foams independently have been used in many engineering applications. However, there has been minimal effort towards taking advantage of the weight saving ability of syntactic foams in the cores of sandwich composites, especially with respect to the impact response of structures. To that end, the goal of this study is to investigate the mechanical response and damage mechanisms associated with syntactic foam core sandwich composites subjected to dynamic impact loading. In particular, this study investigates the influence of varying cenosphere volume fraction in syntactic foam core sandwich composites subjected to varying dynamic impact loading and further elucidates the extent and diversity of corresponding damage mechanisms. The syntactic foam cores are first fabricated using epoxy resin as the matrix and cenospheres as the reinforcement with four cenosphere volume fractions of 0% (pure epoxy), 20%, 40%, and 60%. The sandwich composite panels are then manufactured using the vacuum assisted resin transfer molding process with carbon fiber/vinyl ester facesheets. Dynamic impact tests are performed on the sandwich composite specimens at two energy levels of 80 J and 160 J, upon which the data are post-processed to gain a quantitative understanding of the impact response and damage mechanisms incurred by the specimens. A qualitative understanding is obtained through micro-computed tomography scanning of the impacted specimens. In addition, a finite element model is developed to investigate the causes for different damage mechanisms observed in specimens with different volume fractions.

中文翻译:

复合泡沫芯夹层复合材料的动态冲击行为

夹心复合材料和复合泡沫已独立用于许多工程应用。然而,在夹心复合材料的芯材中利用复合泡沫的减重能力,特别是在结构的冲击响应方面,付出的努力微乎其微。为此,本研究的目标是研究与承受动态冲击载荷的复合泡沫芯夹层复合材料相关的机械响应和损坏机制。特别是,本研究调查了在受到不同动态冲击载荷的复合泡沫芯夹层复合材料中不同煤心体积分数的影响,并进一步阐明了相应损伤机制的程度和多样性。复合泡沫芯材首先使用环氧树脂作为基体和煤胞作为增强材料制成,四个煤胞体积分数分别为 0%(纯环氧树脂)、20%、40% 和 60%。然后使用带有碳纤维/乙烯基酯面板的真空辅助树脂传递模塑工艺制造夹心复合板。在 80 J 和 160 J 两个能级下对夹层复合材料试样进行动态冲击试验,对数据进行后处理以获得对试样的冲击响应和损伤机制的定量理解。通过对受影响标本的显微计算机断层扫描获得定性理解。此外,
更新日期:2019-11-10
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