Determination of cohesive parameters for aerospace adhesives Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/gb19f912d

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  • The use of adhesives in demanding engineering applications is a very common occurrence in the modern world. These adhesives are taking the role of many traditional fasteners, especially in the area of fiber reinforced composites. As the use of these adhesives become more common place, better understanding of their mechanics and failure methods are needed. Adhesives typically do not behave like metals under extreme loading, and so traditional failure analysis methods are not adequate. New numerical methods that combined strength and energy fracture mechanics have shown to be better modeling tools for adhesives. Cohesive zone analysis is one of those methods. This method is limited by the adhesive constitutive parameters that dictate how the cohesive elements will behave in the finite element analysis. There has been a number of studies focused on experimental methods for collecting these parameters, but there exist no prevalent database of values that can be used. The current study will use several different methods to collect cohesive parameters for a group of aerospace adhesives. This will allow researchers to more accurately model structures that use these adhesives, as well as understand strengths and weaknesses between the different testing methods. The adhesives tested in this study were Araldite AV4600, 3M DP420, Locktite E120, Hysol E9359.3, and JB weld. A traction law device was used to investigate and calculate cohesive parameters in mode I and mode II loading. Additional test were used to collect individual cohesive parameters for the two loading modes. After testing was concluded traction laws were created and cohesive strength and toughness values generated. The different tests shows good agreement in most cases with some margin of error for different adhesives. The traction law device proved to be a capable tool for generating traction laws, but required special testing equipment and extensive post analysis. The process of collecting data with this device was time consuming and delicate. Due to these factors the results showed less agreement between test specimen groups and therefor carried less confidence in the parameters generated. The individual tests showed better agreement between test specimens and required less time for experiments and analysis. These however were not capable of generating full traction law curves.
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