Vehicle Glazing/Glass

Expert on Vehicle Glazing/Glass

Related Papers and Presentations

Effects of Laminated and Tempered Glass on Occupant Retention System Design, International Crashworthiness (ICRASH) Conference


More than 50 percent of the occupant lateral retention systems on many vehicles consists of glass. Therefore the characteristics of laminated and tempered glass under impact loading conditions are important to consider in the design of the occupant retention system. The ability of automotive tempered glass and laminated glass to absorb energy for a given loading area is examined both quasi-statically and dynamically. Data is given on the relative performance of laminated and tempered glass applicable to occupant retention in crash scenarios, particularly side impact and rollover. Of particular note is tempered glassís extreme susceptibility to complete failure due to small, dynamic, point-loads. In addition, laminated glass exhibited the ability to handle substantially more energy under concentrated loading than tempered glass. Quantified results are given that will be useful for both occupant retention system design and occupant risk assessment.

Glass into Eye Penetration Modeling and Analysis, 7th International Symposium on Computer Methods in Biomechanics and Biomedical Engineering


With the introduction of airbags and the use of tempered glass in side windows, the incidence of penetrating eye injuries has been reported to be increasing. In this paper we examine whether tempered glass fragments accelerated by an airbag can penetrate the eye.

Our studies include modeling of the airbag interaction with tempered glass fragments to determine imparted velocity for a given fragment size. MADYMO was used to model the airbag-to-tempered glass fragment interactions and determine expected velocities. A methodology was developed to utilize the velocities determined from MADYMO as input to finite element analyses to evaluate eye penetration by the glass fragments in conjunction with the development of a finite element model of the eye and socket.

Results show that the high velocities can be achieved by large tempered glass fragments from the airbag interaction.

Glass System Design for Head Impact Protection with Automotive Bulletproof Glass, Glass Performance Days


Bulletproof glass has been used for many years in vehicles such as armored bank vehicles for the transport of money. More recently, the use of bulletproof glass has increased in executive vehicles. The occupants of these and other vehicles with such glass typically are not wearing helmets. If side curtain airbags are not provided in such vehicles, occupants of these vehicles can have significant head impacts with the bulletproof glass during motor vehicle accidents. The present paper describes the design and development of a glass system to address this issue. Design evaluations are presented comparing alternative glass formulations as part of the head impact protection system. Design characteristics and tradeoffs are discussed. Examples of finite element modeling results associated with the development process are reported. The resulting system significantly reduces the observed head injury measures compared with the baseline system.

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