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Numerical analysis of fragmentation in tempered glass with parallel dynamic insertion of cohesive elements

Jean-François Molinari, Mauro Corrado, Marco Vocialta
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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.

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Proximité ontologique
Génie chimique
Concepts associés (32)
Ultimate tensile strength
Ultimate tensile strength (also called UTS, tensile strength, TS, ultimate strength or in notation) is the maximum stress that a material can withstand while being stretched or pulled before breaking. In brittle materials the ultimate tensile strength is close to the yield point, whereas in ductile materials the ultimate tensile strength can be higher. The ultimate tensile strength is usually found by performing a tensile test and recording the engineering stress versus strain.
Stress–strain curve
In engineering and materials science, a stress–strain curve for a material gives the relationship between stress and strain. It is obtained by gradually applying load to a test coupon and measuring the deformation, from which the stress and strain can be determined (see tensile testing). These curves reveal many of the properties of a material, such as the Young's modulus, the yield strength and the ultimate tensile strength. Generally speaking, curves representing the relationship between stress and strain in any form of deformation can be regarded as stress–strain curves.
Module de Young
Le module de Young, module d’élasticité (longitudinale) ou module de traction est la constante qui relie la contrainte de traction (ou de compression) et le début de la déformation d'un matériau élastique isotrope. Dans les ouvrages scientifiques utilisés dans les écoles d'ingénieurs, il a été longtemps appelé module d'Young. Le physicien britannique Thomas Young (1773-1829) avait remarqué que le rapport entre la contrainte de traction appliquée à un matériau et la déformation qui en résulte (un allongement relatif) est constant, tant que cette déformation reste petite et que la limite d'élasticité du matériau n'est pas atteinte.
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Numerical analysis of fragmentation in tempered glass with parallel dynamic insertion of cohesive elements

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MOOCs associés (8)
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