Experimental investigation of energy dissipation mechanisms in laminated safety glass for combined blast-temperature loading scenarios

Abstract

Protective glazing is an important field of research and development as most common injuries resulting from an explosion event in urban territory are caused by the occurring shock wave and accelerated fragments of failed glass structures. In this context a selection of laminated glass specimens differing in lamination technique, extent of tempering and interlayer material is tested in shock tube experiments at the facilities of the Bundeswehr Technical Center 52 (WTD 52) in Oberjettenberg. Unlike conservative testing the specimen is subjected to a combination of blast and temperature loading. The influence of the interlayer temperature on the laminate behavior is examined according to the elastic response of the composite. Furthermore the paper focusses on the residual load carrying capacity after fracture of the glass component. An assessment of the specimen performance is undertaken by a work balance approach, which leads to the determination of energy dissipation capacities in elastic and damage configurations. This method is suitable for a further breakdown of internal work and dissipation processes. Fracture patterns are evaluated to identify crack densities along paths of principal normal stress. The average strain and strain rates close to originated crack centers are determined. Finally the testing results are superimposed to estimate the impact of material and loading parameters on the overall performance.