Proposed Approach for the Exploration of System Capability and Durability
Based on the fundamental knowledge identified in the dynamic-mechanical material analysis, the assessment approach can be consequently complemented by
Copyright by ASTM Int’l (all rights reserved); Tue May 6 12:07:08 EDT 2014 Downloaded/printed by
Rochester Institute Of Technology pursuant to License Agreement. No further reproductions authorized.
an assessment tool able to validate capability and durability of the complete glazing system (glass-pane-sealant-frame) and it’s interaction with regard to its actual performance. Previous experiences with capability and durability performance assessment of pavement joints under load superposition are available as a general foundation for a practical adaption of this approach on SSG systems [6-8,14]. Based on the needs and requirements, and taking into account the performance-related assessment concept, such a system test must demonstrate the following:
• the functional capability in terms of flexibility, cohesive and adhesive bond strength, indication of imperfections, and debonding,
• the durability in terms of fatigue strength and long-term cohesive and adhesive bond strength under superimposed mechanical and climatic loading,
the technical basis for the realization of this complex system testing approach will be a special adapted testing device (see Fig. 19).
The test facility includes a mechanical loading device to simulate quasistatic and/or dynamic horizontal and/or vertical deformations to emulate various axial and/or multi-axial stress conditions. The loading device is situated in a climate chamber able to apply a simultaneous simulation of the relevant climatic loads, i. e., temperature changes in the range —20 to +60°C, rain, relative humidity in the range 40—95%, and UV irradiation with a wavelength range of 300-400 nm. Both loading devices (mechanical and climatic) are synchronized by a central control unit, thus allowing operation in single as well as coordinated, superimposed loading modes in numerous variations.