Techno-Economic Safety Analysis of Adhesively Bonded Structures
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Techno-Economic Safety Analysis of Adhesively Bonded Structures In numerous fields of technology, such as construction, vehicle and aircraft engineering, structural adhesives are a key enabling technology for bonding various types of materials ensuring their structural performance and safety. The selection of the optimal adhesive is crucial for the bonding success in operation, in terms of safety, quality and performance over the entire service life.
Dr. Martin Brandtner-Hafner
For some time, adhesives have been assuming a leading role in the field of joining technology. They were successfully established as a viable option amongst alternative bonding techniques such as screwing, riveting, welding and soldering. Especially in the automotive, aircraft and building industries, high safety standards are required and necessary. By the end of 1970, several mechanical tests were developed for investigating the adhesive bonding safety from a technical point of view. The most common are the lap-shear test [1–4], the tensile strength test [5–7] and the peeling test [8, 9]. Particularly the first procedure is applied to generate lap-shear stress values for technical datasheets. However, if one considers the associated costs of several thousand euros per data sheet, the question arises whether this procedure is still up-to-date or economical due to its limited informative value with regard to adhesive safety. This is illustrated in Figure 1, where test related influences on the quality of tensile-shear test results are compiled. Nine reasons alone speak against the use of tensile shear tests for the adhesive performance evaluation of joints. Further de30
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Introduction
Figure 1 > Compilation of Influences affecting lap-shear test result quality.
tails can be looked up in earlier publications [10-12].
Materials and methods Regarding the economic analysis of adhesive bonds, only a few publications are available. Some of these sample studies are for instance Arenas et al. [13], who use value analysis for evaluating hybrid bonding technologies and Yang and Rostentrater [14], who conduct a techno-economic analysis of adhesives including life cycle assessment. However, when considering the safety-based analysis of highstrength structural bonds, no comparative studies have been found in the literature to date. Therefore, this article presents a new techno-economic evaluation approach for the adhesive safety of structural adhesives which closes this gap. It is based on a study by Brandtner-Hafner, which was presented at this year’s INAdhesives Symposium in Munich [15]. It takes up aspects of a publication from 2019, which was presented at an international conference on structural adhesives [16]. Techno-economical safety analysis In industrial areas, increasing demands are placed on products’ construction and design. To meet these requirements, adhesive bonding is an ideal supplementary joining technique. However, there are still numerous objections and skepticism regarding the use of bon
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