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Interface fracture test of type I metal composites for fiber metal laminates

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Document pages: 11 pages

Abstract: The main contribution of this paper is to determine the mode I fracture in the metal composite interface of fiber metal laminate (FML). A hybrid DCB structure is proposed to study the mode I fracture between metal composite interface by experimental and numerical methods. In order to consider the influence of metal plasticity on the measurement of fracture energy, an efficient and reliable finite element model is established. The experimental and numerical results show that the metal plasticity increases the fracture energy of the metal composite interface with the progress of fracture events. By extracting the elastic strain energy data, the practical application energy for propagating metal composite interface fracture is predicted numerically The predicted true fracture energy was found to be approximately 50 smaller than the experimentally measured average propagation energy. The study concluded that metal plasticity in hybrid DCB configuration overpredicted the experimentally measured fracture energy, and this can be alleviated through numerical methodology such as the finite element approach as presented in this paper.

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