Glass Expert at Read Consulting performed a glass failure analysis on a broken wine bottle. The objective was to determine the root cause of the bottle failure.Markings on the fracture surfaces (Wallner Lines) were used to trace back to the fracture origin to determine the cause of failure.
Conclusion: The cork extraction force combined with the rough edge of the cork screw crushed the glass at the top of the bottle and created a crack that was driven downward by the extraction of the expanded cork. Eventually the top separated from the bottle causing an injury. The story of the failure is explained by the photographs shown below.