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Paper on cracked laminated glass receives industry recognition

Du Pont Engineering Polymers : 31 January, 2005  (Company News)
A paper, co-authored by Dr. Stephen J. Bennison of DuPont
Dr. Bennison, along with fellow authors of the 2002 paper, Dr. Anand Jagota (then also of DuPont), Professor Sunil Saigal and Dr. Muralidhar Seshadri (then both of the Department of Civil and Environmental Engineering, Carnegie Mellon University, Pittsburgh), received the 2004 Orr Award for contributions to the literature on fracture and failure investigations. The research contained within the paper has contributed strongly to the modelling competency of DuPont Glass Laminating Solutions for understanding and engineering laminated glass.

Laminated glass plates are used in architectural and transportation applications to enhance structural integrity, safety, security and acoustic performance. The mechanical behaviour of the laminates after glass-fracture, for example their projectile energy absorbing capacity and residual stiffness, determines their utility in many applications. This paper provides a framework for analysing the combined influence of interlayer properties and glass properties in order to guide laminate design.

The analytical model and the simulation technique described in the paper can be useful tools for the design of laminated glass structures in terms of determining failure probability in the glass ply. This information is in turn used to generate a set of fragment patterns that are most likely to arise after glass fracture. The polymer layer and the glass–polymer interfacial bonding may then be designed to satisfy a residual strength criterion. The technique is also useful in evaluating the residual strength of damaged laminates and deciding whether replacement is necessary.

The Orr award, presented by ASME, honours the memory of Leighton Orr, whose interest in the properties of fractured glass earned him national renown among engineering professionals in the US. An ASME Life Fellow, he was a Society member for more than 60 years. He headed the physical testing at PPG Industries Research Laboratory in Pittsburgh and retired in 1972. He continued to work as a consultant up until February 2004, handling more than 900 assignments in total.

The paper, ‘Mechanical Response of Cracked Laminated Plates’ by M. Seshadri, S.J. Bennison, A. Jagota and S. Saigal, is published by Elsevier Science Ltd., in the journal Acta Materialia, volume 50, pages 4477–4490, in 2002. Reprints are available from or by calling +1 (407) 345-4020.
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