A chopped‐glass fiber/multi‐walled carbon nanotubes (MWCNTs) hierarchical reinforcing structure was used to toughen the core‐face interlayer of sandwich materials. Chopped‐fiber mats modified by MWCNTs‐COOH were inserted at the face‐core interface before resin infusion. Sandwich beams were prepared by vacuum‐assisted resin transfer molding, containing a Polyvinylchloride (PVC) foam core covered with two glass fiber/epoxy composite face sheets. The mechanical properties were characterized using quasi‐static three‐point‐bending, Charpy impact, and asymmetric double cantilever beam. Improvement in mechanical properties and interlayer toughness was achieved in the sandwich structure with negligible weight increase and processing variations. The interfacial characteristics between chopped glass fibers, carbon nanotubes, and underlying energy absorption mechanisms were discussed and analyzed using scanning electron microscopy.

中文翻译：

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短切玻璃纤维/碳纳米管增强分层结构夹层泡沫夹芯的力学性能

短切玻璃纤维/多壁碳纳米管（MWCNT）分层增强结构用于增强夹心材料的芯面中间层。在树脂注入之前，将由MWCNTs-COOH改性的切碎的纤维毡插入面部-核心界面。夹层梁是通过真空辅助树脂传递模塑法制备的，其中包含一个聚氯乙烯（PVC）泡沫芯，上面覆盖有两个玻璃纤维/环氧树脂复合面板。力学性能通过准静态三点弯曲，夏比冲击和非对称双悬臂梁来表征。夹层结构的机械性能和层间韧性得到改善，而重量增加和加工变化可忽略不计。短切玻璃纤维，碳纳米管，