Research on improving the interlayer fracture performance of CFRP laminates with nano ZnO resin films

doi:10.19936/j.cnki.2096-8000.20250428.009

Abstract

Abstract: Carbon fiber reinforced plastics (CFRP) laminates are prone to damage and instability when subjected to out of plane loads due to their significantly lower normal stiffness compared to in-plane stiffness. In order to toughen the thickness direction, the effect of modified nano ZnO toughened films on the mechanical properties of CFRP laminates was studied. Nano-ZnO is first modified by coupling agent to obtain modified nano-ZnO, which was added into epoxy resin as nano-filler. By blending modified nano-ZnO particles at different mass ratios from 0 to 4wt% in the presence of a curing agent, some cohesive films with different interlaminar properties were formed between the two interfacial surfaces in a composite specimen, which have been applied in end-notched flexure (ENF) tests and double cantilever beam (DCB) tests. A series of finite element (FE) models, together with the predetermined model parameters, were built to assess the influence of modified nano-ZnO and curing agent. The results show that, for the toughened beam (with 4wt% modified nano-ZnO and 2wt% GEL2-BS), the critical loads of ENF tests and DCB tests increases by 30.25% and 68.40%, respectively.

Key words: cohesive film, modified nano-ZnO particles, interface toughening, end-notched flexure (ENF) tests, double cantilever beam (DCB) tests

CLC Number:

TB332

DU Xuwei, NIU Xuejuan. Research on improving the interlayer fracture performance of CFRP laminates with nano ZnO resin films[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(4): 74-81.

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