Post Breakage Strength Testing for overhead Laminated Glass

Ingo Stelzer
Manager, Global Technical Consultancy
Kuraray America, Inc., Hattersheim

The design and structural performance of laminated glass in glazing applications like canopies and skylights is very critical, as it has an impact on the safety of occupants in a building and maintenance workers. For such applications, the post breakage strength of laminated glass construction is of the utmost importance. Pre-breakage strength can be predicted with reasonable accuracy by FEM technique-based software, which allows the user to input the mechanical properties of interlayers along with glass. This helps in the interlayer-based differentiation of pre-breakage structural strength and design optimization. However, the post-breakage strength of glass is still an unknown area, as analytical models for this are inconclusive so far and thus destructive testing is the only reliable solution. Impact testing, simulating the accidental fall of a maintenance worker (prDIN 18808-6) was done to assess the “fall through” resistance of point fixed laminated glass constructions having varying interlayers at different temperature levels.

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