"The objective of the research is to characterize the behavior of composite/composite joints with paste adhesive using both experimental testing and analytical modeling. In comparison with the conventional tape adhesive, joining composites using paste adhesive provides several advantages. The carbon fiber laminate material systems employed in this study included IM7 carbon fibers and 977-3 epoxy matrix assembled in prepreg tape, and AS4 carbon fibers and 977-3 epoxy matrix as a five-harness satin weave. The adhesive employed was EA 9394 epoxy. All laminates and test specimens were fabricated and inspected by Boeing using their standard propriety procedures. Three types of test specimens were used in the program. They were bonded double-lap shear (DLS), bonded double cantilever beam (DCB) and bonded interlaminar tension (ILT) specimens. A group of specimens were conditioned at elevated temperature and humidity in an environmental chamber at Boeing's facility and their moisture absorption recorded with time. Specimens were tested at room temperature dry and elevated temperatures. DCB and DLS specimens were tested in fatigue as well as static conditions. Two-dimensional finite element models of the three configurations were developed for determining stresses and strains using the ABAQUS finite element package code. Due to symmetry, only the one-half of the specimen needed to be considered thus reducing computational time. The effect of the test fixture is not taken into account instead equivalent distributed stresses are applied directly on the composite laminates. For each of the specimen, the distribution of Mises stress and the first strain invariant J₁ are obtained to identify potential failure locations within a specimen"--Abstract, page iv.
Dharani, Lokeswarappa R.
Ramsay, Christopher W.
Berkel, Thomas R.
Mechanical and Aerospace Engineering
M.S. in Aerospace Engineering
Air Force Research Laboratory (Wright-Patterson Air Force Base, Ohio)
Missouri University of Science and Technology
ix, 31 pages
© 2013 David Lee Harris, All rights reserved.
Thesis - Open Access
Composite materials -- Testing
Strains and stresses -- Computer simulation
Electronic OCLC #
Harris, David Lee, "Modeling of fracture and durability of paste-bonded composite joints subjected to hygro-thermal-mechanical loading" (2013). Masters Theses. 5450.