Self-sensing PET-CNT nonwoven interleaf for the integrated interlaminar toughening and structural monitoring of glass fiber reinforced composites
Glass fiber reinforced composites(GFRC)are a popular,low-cost,and lightweight structural material widely used in green energy fields,such as wind power generation,new energy vehicles,and battery shells.However,delamination damage is a common issue in GFRC structures during service.To improve the out-of-plane mechanical properties of laminated GFRC,various interlaminar materials have been extensively studied and applied.To prevent sudden delamination of GFRC during service,it is crucial to develop an in-situ,real-time,on-line non-destructive monitoring method to monitor the structural health of the system.This will help avoid catastrophic failure caused by sudden delamination.A PET-CNT self-sensing nonwoven composite interleaf was developed by using high-porosity PET nonwoven fabric,introducing functional intercalation into the interlayer relative to GFRC for modification.In addition,the one-step impregnation method produced a PET-CNT nonwoven interleaf with a multi-level network structure of entangling,loose and porous,allowing full impregnation with resin matrix.Upon solidification,a continuous and dense CNT-CNT seepage induction network was formed.The results demonstrated an 86％increase in initial fracture toughness(GIC.ini)and a 48％increase in propagation fracture toughness(GIC,prop)of the modified GFRC,effectively enhancing its mode Ⅰ interlaminar fracture toughness(ILFT).Real-time acquisition of piezoresistive response and establishment of quantitative mapping relationship between resistance change and crack growth length revealed a 270％gain factor in resistance change rate during the experiment,demonstrating excellent in-situ monitoring sensitivity and accurate efficiency in monitoring the entire process of crack growth in DCB experiment.In this study,a new PET-CNT nonwoven composite interleaf suitable for GFRC was prepared,and its integrated response behavior of interlayer toughening-structure monitoring was analyzed and verified,which proposed an effective and structural optimization method to improve the structural stability of GFRC and the overall robustness of GFRC throughout its life cycle.Additionally,it also provided a new scenario for expanding the industrial application of functional nonwoven materials.
万方数据
维普
