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Working Group 2

Characterization and Material Improvement
Material Charecterisation


Aims & Objectives


The actual strength of glass is several orders of magnitude lower than the molecular strength due to the stress raising surface flaws. The effects from stress corrosion caused by prolonged exposure of surface flaws to stress are relatively well understood.  Other important factors that affect the surface characteristics are however the subject of on-going research, namely: 
  • The extent to which inferior quality float glass affects structural performance. 
  • The effect of cutting technique and edge finish on the strength of annealed glass.
  • The variations in tempering pre-stress close to discontinuities of heat treated glass (such as edges and holes) and the variability in tempering pre-stress close from one heat treatment plant to another. 
  • The extent of surface damage accumulation caused by natural causes or from malicious attack and how these affect the long term strength of glass. 
  • The ability of surface coatings and other surface engineering techniques to reduce the incidence and growth of surface flaws and thereby increase the strength of glass. 
  • This fundamental characterisation research is essential for using glass efficiently. The work in this area draws on elastic fracture mechanics and on the latest developments in non-destructive surface characterisation techniques such as atomic force microscopy and strain polarimetery.
  • Other fields to be discussed within the group are the scratch resistance of glasses and coatings, the glass surface behavior and surface classification under different environmental conditions, building site conditions and long term weathering.
  • Moreover, the material characterization and material improvement of glasses by lamination with different interlayer materials are within the focus. The goal within the working group is to discuss and develop experimental and numerical methods to classify the mechanical behavior of viscoelastic interlayer materials for the unbroken and the broken state of the glass. Here, an interaction  with WG1 and WG3 is required.

Task Groups

Within Working Group 2 different sub-themes are addressed and Task Groups have been formed accordingly, which are:

TG 4: Thermal tempering

TG Leader: Prof Reijo Karvinen

Title First Name  Last Name Organisation Country
Dr Fabrice Bernard INSA Rennes FR
Prof Reijo Karvinen Tampere University  FI 
Dr Jens Henrik  Neilsen  Technical University Denmark  DK 
Prof Jens  Schneider  Technical Universität Darmstadt  DE
Mr Marco Zaccaria University of Cambridge UK

TG 5: Glass strength and ageing of glass
Leader: Mr Marc Vandebroek, Ghent University, BE
Title First Name  Last Name Organisation Country
Prof           Ezio Cadoni University of Applied Sciences of Southern Switzerland CH
Mr Jonas Hilcken Technische Universität Darmstadt FI 
Mr Gergely  Molnár  Budapest University of Technology and Economics HU
Mr Sebastian  Schula  Technische Universität Darmstadt  DE            
MsCostanzaRonchetti Universitá degli studi Roma Tre IT
Prof.GinevraSalerno Universitá degli studi Roma Tre IT

TG 6: Interlayer Properties
Leader: Dr Gérard Savineau

Title First Name  Last Name Organisation Country
Ms Caroline Butchart University of Cambridge UK
Dr Dieter Callewaert Scheldebouw BE 
Mr Paulo   Carvalho  University of Minho  PT 
Mr Didier  Delincé Ghent University BE
Prof Gintaris  Kaklauskas  VGTU  LT 
Mr Heinz Pfefferkorn  GBD Engineers  AT 
Mr  Juozas  Ramanauskas  Kaunas University of Technology  LT 
Dr  Gérard Savineau Independent FR 
Mr Tomas Serafinavičius Vilnius Gediminas Technical University LT