The simulation of laminated glass loaded by air blast waves is complex. The behaviour of Polyvinylbutyral (PVB) under short term loading shows an elastic-hardening behaviour. The Young’s modulus and the hardening factor depend on the strain rate. Several numerical models are investigated to find a model which represents the failure of the glass as well as of the PVB interlayer. Layered elements with a special failure criterion can be used very efficiently. The integration points over the thickness use different materials. After the failure of an integration point in glass, the stresses in this integration point are set to zero if the strains are positive. The material can still react to compression stress. If the interlayer reaches the failure criterion of PVB, the element is eroded. The layered model shows a good correlation with experiments – also in cases where the interlayer fails. In comparison to this a full 3D solid model is presented, where the behaviour of the combination of the glass splinters and the interlayer can be investigated. A new experiment with laminated glass is performed to validate the numerical results. The laminated glass is clamped to a metal frame and loaded by an air blast wave using a shock tube. The experiments are compared with calculations. The numerical model can represent the experimental behaviour and can be used to simulate the failure of laminated glass loaded by air blast waves.

LARCHER Martin;  GEBBEKEN Norbert;  TEICH Martien;  SOLOMOS George; 

2011-11-04

Katholieke Universiteit Leuven

JRC65807

https://publications.jrc.ec.europa.eu/repository/handle/JRC65807,