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Development of a cohesive zone model for adhesive joints that includes humidity and fatigue degradation
Başlık:
Development of a cohesive zone model for adhesive joints that includes humidity and fatigue degradation
Yazar:
Costa, Marcelo Bruno Serrão Fontes Parente da, author.
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (113 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 76-09C.
Özet:
Adhesive joints in critical structures of industries such as aeronautical and automotive are exposed to environmental degradation agents such as humidity, which should be carefully considered as they will reduce the mechanical properties of said joints in the long term. Furthermore, cyclic loadings will also degrade the joint, so the combined effect of moisture degradation and fatigue on adhesive bonds should be understood.
To that effect, this work combines extensive experimental testing under various moisture degradation levels to determine the in uence of humidity in the properties of adhesive joints under mode I. Firstly, specimens with reduced dimensions are proposed and validated which allow for faster saturation times, the possibility of being tested in an in-house environmental chamber and also increased speed in the manufacture process of all needed specimens: bulk tensile and double cantilever beam. Fick's law is determined for each studied adhesive, followed by immersion of the developed specimens in containers with distilled water. The specimens are then removed from the container at different time steps, which translates to different levels of average moisture content in the joint, and tested in both static and cyclic conditions. This allows for the relevant properties to be determined as a function of moisture content. Relationships are then determined for the evolution of each property as a function of moisture, so that the value of the property for any moisture concentration may be estimated. Finally, a finite element is created which encompasses all the previously determined relationships, allowing for an otherwise unaged adhesive joint to be simulated under both moisture and fatigue conditions. The element was studied for various types of conditions against experimental data and was found to accurately model stages of moisture degradation under static and fatigue conditions, thus has proved itself as a robust tool for modelling ageing in adhesive joints under mode I.
Notlar:
School code: 5896
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(691206.1) | 691206-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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