Numerical analysis of fragmentation in tempered glass with parallel dynamic insertion of cohesive elements
Tempered glass is subjected to high eigenstresses that induce a state of compression along the surface and a state of tension inside the material. Whenever a crack reaches the tensile region, it rapidly propagates and branches in all directions driven by the eigenstress. These mechanisms induce dynamic fragmentation in tempered glass. The present work contains a numerical investigation of this phenomenon on plates with different thicknesses, using massively parallel simulation based on FEM with the dynamic insertion of cohesive elements. Simulations are first validated by comparing the obtained number of fragments with experimental data. Then, the resulting energy fields are examined and they show that the dissipated energy is significantly underestimated by the existing analytical models. Finally, an extended analytical model that includes the influence of the plate thickness is proposed to correctly estimate the number of fragments for high eigenstresses.