Stress Generation in Float Glass Plates Loaded with Blast Wave in a Vertical Square Shock Tube

Abstract

In order to study a glass plate strength against loading by explosion, stress generation of 300 mm×300 mm×19 mm float glass by blast wave loading was investigated by using a vertical square shock tube. Blast wave was produced by a vertical shock tube with an improved high-pressure chamber by inserting a cone-shaped material. Stress generation after maximum value upon blast wave was dependent on the decay pattern of blast wave loading. Stress generation σ(t, d*) at time t and normalized non-dimensional thickness d* by blast wave loading can be shown as using as a function of time t, various parameters: dynamic coefficient, Cd, static coefficient, Cb, two factors ω and λ dependent on glass thickness, decay constant A and positive time of blast wave tp: σ(t, d*)=Cd sin ωt•exp{−λ(t-π/2ω)}+Cb{1−(t-π/2ω)/tp}•exp{−A(t−π/2ω)/tp}with an additional decay term to blast wave equation due to shock tube loading. Further, it is suggested that shock wave loading and blast wave loading have almost similar influence on failure of glass.