Date of Award
Winter 2014
Project Type
Thesis
Program or Major
Mechanical Engineering
Degree Name
Master of Science
First Advisor
IOANNIS Korkolis
Second Advisor
Todd S Gross
Third Advisor
Yaning Li
Abstract
The mechanical behavior and material properties of a Stainless Steel SS-304L microtube, with an OD of 2.40 mm and wall thickness of 160 µm, was investigated through uniaxial, isothermal, biaxial, and metallographic testing. The grain structure, microhardness, and tube eccentricity were investigated using optical microscopy. The rate- and temperature-dependence of the material was characterized by isothermal uniaxial tension experiments. A biaxial experimental setup, consisting of a 2 kN electromechanical tensile stage and a 1.4 kbar hydraulic pump, was created to internally pressurize and axially load the microtube in biaxial stress states. Fourteen radial nominal stress path tests were conducted to determine the formability, failure mode, and anisotropy during biaxial stress states. The Yld2000-2D and Yld2004-3D yield functions were fit to the data at the initial yield surface and higher levels of plastic work. The path-dependence of failure stresses and strains was investigated by comparing radial path results to corner paths.
Recommended Citation
Ripley, Peter William, "BIAXIAL STRESS TESTING OF SS-304L MICROTUBES BY AXIAL LOAD AND INTERNAL PRESSURE" (2014). Master's Theses and Capstones. 1004.
https://scholars.unh.edu/thesis/1004