In construction industry, laminated glass is more and more used for transparent loadbearing building components. It is known that the residual load-carrying capacity after glass breakage of glass/PVB (polyvinyl butyral) laminates is relatively poor, mainly due to the limited stiffness and strength of PVB. For that reason, the failure behaviour of laminates composed with a stiffer and stronger interlayer material, called SentryGlas ® Plus (SGP), was investigated experimentally. Consequently, 1100 mm long test samples composed of two annealed float glass layers and one SGP interlayer were subjected to destructive in-plane four-points bending tests. Subsequently, different stages were distinguished during the failure process, corresponding to a different number of broken glass layers. In spite of the relatively good interlayer material properties and in contradiction to what was expected, the observed post-failure safety was poor.However, the failure mechanisms observed were significantly different from those of glass/PVB beams: due to a lack of local delamination near the glass fracture zone, tear of the SGP interlayer occurred without preceding large visual interlayer elongations.
Transparent polymer interlayer foils are widely used to increase the safety of glass applications, mainly in construction and automotive industry. In case one or more glass sheets in a laminate fracture, the remaining structural capacity (i.e. stiffness and strength) highly depends on the solicitation and mechanical properties of the interlayer. In such a post-breakage state, the interlayer is subjected to a complex combination of phenomena such as partial delamination, large strain deformation, strain hardening, rupture, etc. In partim 1, an analytical model is presented in order to describe the mechanical behavior of glass laminates in post-breakage state for a simple configuration. In addition, the theoretical model is compared to experimental results in part 2, which is published together with part 1.
Transparent polymer interlayer foils are widely used to increase the safety of glass applications, mainly in construction and automotive industry. In case one or more glass sheets in a laminate fracture, the remaining structural capacity (i.e. stiffness and strength) highly depends on the solicitation and mechanical properties of the interlayer. In such a post-breakage state, the interlayer is subjected to a complex combination of phenomena such as partial delamination, large strain deformation, strain hardening, rupture, etc. In part 1, an analytical model was presented to describe the mechanical behavior of glass laminates in a post-breakage state in which both glass plates are broken. In addition, a comparison of the theoretical model with experimental results is presented in part 2 below.
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