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Date of Publication:2022-10-06

Journal:材料研究学报

Volume:26

Issue:6

Page Number:583-589

ISSN No.:1005-3093

Abstract:Finite element analysis was used to analyze thermal stress distribution
   in CF/BMI composite under exposure to thermal cycles. Parabolic failure
   criterion was used to predict the potential failure zone in composite.
   Birth and death element technique was used to reveal the microcracks
   distribution in composite induced by thermal stress. Thermal stress at
   composite free end zone is higher than that in inner zone, and the
   maximum stress locates at the fiber surface in resin-rich area of free
   end zone. The potential failure zones locate at free end zone with the
   microcracks distributed along the interface, thus leads to interfacial
   debonding failure in composite. During the following thermal cycle, the
   thermal stress which is alleviated to some extent and redistributed,
   extends from free end zone to inner zone, thus exacerbates the degree of
   interfacial debonding. Properties evolution of CF/BMI composite
   subjected to thermal cycles were investigated, showing that the
   interfacial bond property was decreased due to the formation of
   microcracks along the interface. The numerical simulation results are in
   good agreement with the experiment results, which reasonbly expect the
   potential failure zone in composite and analyze the reason of decrease
   in interfacial bond property induced by thermal cycles.

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