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Experimental Studies Of Fatigue Performance Of Inconel 718 And Fiberglass Reinforced Vinylester, Sean Gribbin

Master's Theses and Capstones

Fatigue performance of structural materials depend on their microstructure and manufacturing processes. In this thesis, two different materials are investigated: additively manufactured Inconel 718 and a fiberglass reinforced vinylester composite.

The microstructural features of a direct metal laser sintered Inconel 718 are compared to a traditionally manufactured wrought Inconel 718. The effects of 3D printing direction and heat treatment are studied. Low cycle fatigue specimens manufactured by Turbocam International are tested at strain amplitudes from 0.6% to 1.4% engineering strain. These data are correlated to the microstructural features seen in the electron backscatter diffraction. High cycle fatigue specimens are tested …

Experiments And Analysis Of Aluminum Tube Hydroforming, Adam Ryan Kaplan

Master's Theses and Capstones

This is a thesis on the development of an experimental table-top sized tube hydroforming machine at the University of New Hampshire. This thesis documents the design of the machine and the exploration of the forming envelope of the device via finite element modeling of the forming process. Several experiments on Al-6061-T4 tubes were used to evaluate the plastic behavior and strain limits of the tube in the axial and circumferential (hoop) directions. Two of these material tests, the uniaxial tension test and the ring hoop tension tests, were simulated with finite element models to refine the Al-6061-T4 plasticity curve, including …