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Study on dynamic propagation characteristics of in-plane crack in PVB laminated glass plate

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Document pages: 13 pages

Abstract: Polyvinyl butyral (PVB) laminated glass has been widely used as an important part of machinery and building materials. The crack of PVB laminated glass has rich impact information, which is helpful to its impact resistance design. Firstly, a three-dimensional numerical simulation model of PVB laminated glass under impact load is established, and compared qualitatively and quantitatively with the corresponding experimental results recorded by high-speed photography system. At the same time, based on the dynamic stress intensity factor (DSIF) and stress wave propagation, the extended finite element method (XFEM) is introduced to analyze the crack propagation mechanism of laminated glass. Then a parametric study was carried out to studyte the influence of five critical parameters, that is, plate dimension, crack length, impact energy, glass properties, and PVB properties, on crack propagation characteristics of laminated glass. Results show that the interaction between crack tip and stress waves as well as the propagations of stress waves corresponds to the fluctuations of DSIFs at crack tip. Both the structure and material variables are proven to play a very important role in glass cracking DSIFs and thus govern the crack propagation behavior. Results may provide fundamental explanation to the basic crack propagation mechanism on radial cracks in PVB laminated glass under impact loading conditions, thus to instruct its impact design improvement.

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