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Pan L.,Nanjing University of Aeronautics and Astronautics | Cao J.M.,Nanjing University of Aeronautics and Astronautics | Yapici U.,Nanjing University of Aeronautics and Astronautics | Duan L.X.,Nanjing University of Aeronautics and Astronautics | And 2 more authors.
Materials Research Innovations | Year: 2015

The finite element analysis technique and the cohesive zone model are used to build a physical model of fibre reinforced metal laminates with a corrugate interfacial structure between metal and polymer to analyse the law of interfacial fracture toughness. The results suggest that an interface with a patterned structure has a relatively higher interfacial resistance ability than an interface with a common flat structure within limits. The ratio of stress intensity factor (KIC/K0) nearly increases linearly when the ratio of amplitude to wavelength (A/λ) is larger than 0·25; moreover, the variational trend of KIC/K0 is not linear when A/λ is smaller than 0·25, even the value is less than 1·0. The aforementioned results illustrate that the interfacial fracture toughness changes with the size and morphology regularly at some ranges and have some guidelines for experimental design of surface treatment. Source

Hu Y.B.,Nanjing University of Aeronautics and Astronautics | Li H.G.,Nanjing University of Aeronautics and Astronautics | Cai L.,Chengfei Precision Alloy Stick Co. | Zhu J.P.,Chengfei Precision Alloy Stick Co. | And 3 more authors.
Composites Part B: Engineering | Year: 2014

A novel Fibre-Metal Laminates (FMLs) based on carbon fibre reinforced PMR polyimide were prepared using a hot press process in this paper. Pre-treatment on the titanium surface were conducted prior to laminating. Scanning Electron Microscope (SEM) were used to observe the morphologies of the titanium and the cross-sections of the FMLs. SEM results showed that micro-roughness structures were formed on the titanium surface after anodization. This structure enhanced the interlaminar bond strength between titanium and polyimide. Flexural and Interlaminar shear (ILSS) tests showed that the FMLs possess excellent flexural and interlaminar properties at both room temperature and elevated temperature. Thermostability tests proved that the FMLs based on carbon fibre reinforced PMR polyimide offered excellent thermal properties. It is shown that no delamination appears between titanium layer and the fibre-reinforced polyimide layer after 1000 times thermal shock. © 2014 Elsevier Ltd. Source

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