Abstract
A glued joint is a suitable connection between a glass pane and a framework. The mechanical properties of adhesives are not given in specifications. The most important property of adhesives is the shear - strain relation. Tests are carried out to determine this relation under prescribed conditions. Curing conditions, short-lived increase of temperature, storing time and testing protocol are the same for each adhesive. Two adhesives, polyurethane and epoxy, are tested at a constant deformation rate and at three different temperatures. Polyurethane has a low stiffness which slightly increases with larger strains. The stiffness and shear strength decrease with increasing temperature. Epoxy shows a stiff and toughened shear - strain relation at room temperature. Under frozen conditions, the epoxy has a larger stiffness and shear strength, but fails brittle. The stiffness significantly decrease at high temperature accompanying with large strains. Both
adhesives are subjected to a short-lived increase of temperature three days after making the specimens. This had favourable effect on epoxy (post curing), leading to a more toughened behaviour. Polyurethane shows smaller values for shear stress and larger values for strain. After longer storing time each adhesive shows a slightly increase of the shear strength. The shear modulus of the adhesives has been determined. The shear modulus of polyurethane can be simplified by a bi- or tri- linear diagram and for epoxy by a linear diagram. Finally, the found shear strength is not the ultimate shear strength, because all test specimens fail adhesively instead of cohesively.
Original language | English |
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Title of host publication | Proceedings of the 10th International Conference on Architectural and Automotive Glass, 15-18 June 2007, Tampere, Finland |
Place of Publication | Tampere, Finland |
Publisher | Glass Performance Days, Tamglass Ltd. Oy |
Pages | 367-370 |
ISBN (Print) | 952-91-8674-6 |
Publication status | Published - 2007 |
Event | conference; 10th International Conference on Architectural and Automotive Glass, Tampere, Finland; 2007-06-15; 2007-06-18 - Duration: 15 Jun 2007 → 18 Jun 2007 |
Conference
Conference | conference; 10th International Conference on Architectural and Automotive Glass, Tampere, Finland; 2007-06-15; 2007-06-18 |
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Period | 15/06/07 → 18/06/07 |
Other | 10th International Conference on Architectural and Automotive Glass, Tampere, Finland |