PERFORMANCE OF ADDITIVELY MANUFACTURED COMPOSITE JOINTS

  • Edem Dugbenoo

Student thesis: Master's Thesis

Abstract

Composite adhesive joints were fabricated using 3D printed continuous fiber reinforced polymer composite adherends and their performance was experimentally evaluated under monotonic tension. The additive manufacturing process was tailored to create a net-like structure of loosely packed nylon filaments on the bonding surface of the adherends. Single-lap joints fabricated from adherends sporting this net-like structure showed joint strengths 180% greater than geometrically similar joints whose adherend bonding surface is comprised of closely packed nylon filaments and has undergone a conventional surface treatment procedure. These net-like joints also show joint strengths 480% greater than joints with closely packed nylon filaments and no surface treatment. The effect of using carbon, kevlar, and glass reinforcing fibers on the performance of additively manufactured composite joints was examined and it was found that the joint strength is proportional to the stiffness of the fibers used. It was also demonstrated how the change in fiber orientation within the bonded region can impart strain-tolerance to joints and thus improve joint performance. As additively manufactured parts are increasingly being joined to create structures which are larger than the build volume of available 3D printers, this study demonstrates how the mechanical performance of 3D printed composite adhesive joints can be tailored by modifying the surface and microstructure of the adherends via the 3D printing process itself.
Date of AwardDec 2016
Original languageAmerican English
SupervisorKumar Shanmugam (Supervisor)

Keywords

  • Additive Manufacturing Technologies(3D Printing)
  • Additive Manufacturing Industry
  • Rapid Prototyping
  • Computer Aided Design
  • Digital Light Processing

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