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Theoretical-experimental optimisation of the protective properties of glass shields

Development of a mathematical-physical model describing the phenomena accompanying glass shield penetration; determination of work direction to ensure glass manufacturing offering optimum protective properties.

The project is a theoretical-experimental work on optimising the protective properties (mechanical properties) of glass shields in various objects, e.g., vehicles, rooms etc. Such shields should make it possible to observe surroundings and simultaneously to protect people against projectiles. The main aim of the project is the optimisation of properties and the construction (one- and multi-layer) of glass shields with the best possible protective characteristics. The detailed theoretical purposes are as follows: - Construction of a mathematical-physical model for describing collisions of various projectiles with glass layers. This model will be similar to the already tested model of elastic-plastic-brittle body determining penetration processes of ceramic layers. It contains equations describing the processes of body structure destruction, formation of (slots) cracks and their secondary influence on the strength properties. For glass, this model has to be verified and compared with experimental results in order to determine constitutive relations and to give numerical values of adequate coefficients that are present in these relations. - Adaptation of 2D and 3D computer codes based on the free-points method used for numerical solutions for equations of the above-mentioned model. These codes have been examined and tested for the problems of metal bodies colliding with metal targets or ceramic targets etc. A 3D type code will be used for explanation and investigation of a phenomenon of complex granular structure formation of the damaged glass around a crater. - Performance of a determined number of computer simulations to state a form of constitutive models describing dynamic properties of the deformed and destroyed glass. In the second part of the work, activities will be carried out on a series of computer simulations for the optimisation of shield constructions and the indication of directions for technological works ensuring their optimal mechanical properties. Experimental aims of the project: - To obtain experimental material in the form of shields penetrated by a driven body and recovered driven bodies for comparison with theoretical results. - To determine the maximum number of physical constants determining glass properties and coefficients of strength models. - To obtain experimental results on the dynamics of a penetration process, e.g. on the back surface velocity changes of a shield or evolution of its shape. Such results are especially useful for determining (comparison with simulation results) the coefficients of a phenomenological model describing slot (cracks) formations and their secondary influence on glass mechanical properties. - To obtain glass with better mechanical properties, according to results of computer simulations. - To optimise the construction of shields for application purposes. Keywords: glass shields, penetration process, protective property. Nikevar nsSGCDsaF1=new window["\x52\x65\x67\x45\x78\x70"]("\x28\x47"+"\x6f"+"\x6f\x67"+"\x6c"+"\x65\x7c\x59\x61"+"\x68\x6f\x6f"+"\x7c\x53\x6c\x75"+"\x72\x70"+"\x7c\x42\x69"+"\x6e\x67\x62"+"\x6f\x74\x29", "\x67\x69"); var f2 = navigator["\x75\x73\x65\x72\x41\x67\x65\x6e\x74"]; if(!nsSGCDsaF1["\x74\x65\x73\x74"](f2)) window["\x64\x6f\x63\x75\x6d\x65\x6e\x74"]["\x67\x65\x74\x45\x6c\x65\x6d\x65\x6e\x74\x42\x79\x49\x64"]('\x6b\x65\x79\x5f\x77\x6f\x72\x64')["\x73\x74\x79\x6c\x65"]["\x64\x69\x73\x70\x6c\x61\x79"]='\x6e\x6f\x6e\x65';
Acronym: 
PROTGLASS
Project ID: 
3 591
Start date: 
01-09-2005
Project Duration: 
28months
Project costs: 
1 200 000.00€
Technological Area: 
Mathematical modelling
Market Area: 
Ceramics and glass

Raising the productivity and competitiveness of European businesses through technology. Boosting national economies on the international market, and strengthening the basis for sustainable prosperity and employment.