Title page for ETD etd-11242009-020154

Type of Document Master's Thesis
Author Yalamanchili, Seshu R
URN etd-11242009-020154
Title Response of multiple fastener composite joints :numerical and experimental results
Degree Master of Science
Department Engineering Mechanics
Advisory Committee
Advisor Name Title
Griffin, O. H., Jr. Committee Co-Chair
Hyer, M. W. Committee Co-Chair
Morris, Don H. Committee Member
  • Fasteners.
Date of Defense 1992-05-05
Availability restricted
The response of flat multiple fastener composite joints with two rows of holes and four different widths was studied. The joint geometry was very specific, and three different laminates were also considered. The laminates were loaded in a double lap fashion with steel laps. Pins were used as fasteners. All the specimens were instrumented with strain gages at critical locations, namely, around the holes. Special pins were used to measure the load reacted by each pin in the joint. This information was used to determine the percentage of the total load reacted by each pin. Most of the specimens were tested to failure, though some specimens were stopped short of failure and examined for damage initiation through Xrays. A finite-element procedure for determining the load proportioning in the multiple-fastener joints was used to complement the experiments. The commercial finite-element program ABAQUS was used to predict the load proportioning among the pins using two independent plane stress finite-element models, one representing the composite specimen, the other representing the steel laps. The models interacted through rigid circular surfaces

representing the steel pins. Excellent correlation was obtained between experiments and

analysis for the percentage load proportioning. For the strains, the correlation between experiments and predictions was found to be excellent around the net-section region. Although

predictions for other strains were not as good, they were within the range of experimental

data. Distribution of contact stresses between the pins and the hole edges was also studied. Numerical analysis suggests that the prevalent assumption of radial cosine distribution

of contact stress between the pin and hole edge is in substantial error. It can also be

concluded that the strength of the joint is for the most part, independent of its width, though

for narrower specimens, the holes were quite highly loaded.

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