The investigation of damage evolution behaviour on adhesive interface of composites using nano-adhesive

doi:10.19936/j.cnki.2096-8000.20220428.012

Abstract

Abstract: Adhesive plays an important role on the repair efficiency and durability in the field of composites patch repair. Thus, it is important to carry out the optimization studies of adhesive. In this study, aiming to improve the mechanical strength and flexibility of epoxy resin adhesive, 0.1wt% cellulose nanofibers were added into epoxy resin to make nano-adhesive, so as to increase its repair efficiency and durability. Mechanical behaviors and deformation damages of different repair configurations under three-point bending loads were investigated by a combination of acoustic emission and digital image correlation technologies. Failure mechanisms were deeply discussed through the analysis of characteristic signals, cluster results as well as the measurement of global and local strain/displacement fields. According to the cluster analysis results and acoustic emission response of interior damage, the repair performance could be assessed and the main damage modes could be obtained. The deformation fields on the adhesive interface of different repaired specimens obtained from digital image correlation method could help to monitor the damage initiation and extension within adhesive layer. The experiment results showed that nano-adhesive had better bonding effect and showed higher energy absorption and load transfer capacity. The failure load and maximum displacement of repaired specimens were increased by 3.1% and 6.1%, respectively, compared with epoxy resin adhesive. The amplitude, frequency, relative energy and cumulative hits of acoustic emission signals of different repaired composites could successfully reflect the damage changes from micro-scale to macro-scale. The real-time displacement fields and strain fields obtained from digital image correlation technology provided the information of damage accumulation on the adhesive interface. The experimental results of mechanics were in agreement with the analysis results of acoustic emission and digital image correlation technologies. The damage evolution behaviors on the adhesive interface were realized through establishing the correspondence of acoustic emission characteristic response and internal deformation damage.

Key words: complementary non-destructive testing technologies, cellulose nanofibers, repair efficiency, damage evolution of adhesive interface, composites

CLC Number:

TB332

JI Xiao-long, ZHOU Wei, DU Yong-gang, LIU Jia, MA Lian-hua. The investigation of damage evolution behaviour on adhesive interface of composites using nano-adhesive[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(4): 73-80.

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