Mechanical Behavior of Metals Under Triaxial Stress: Apparatus and Experiments
Balzer, Mark Anthony
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https://hdl.handle.net/2142/83973
Description
Title
Mechanical Behavior of Metals Under Triaxial Stress: Apparatus and Experiments
Author(s)
Balzer, Mark Anthony
Issue Date
1998
Doctoral Committee Chair(s)
Sehitoglu, Huseyin
Department of Study
Mechanical Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Mechanical
Language
eng
Abstract
Under combined axial-stress/external-pressure loadings, a solid specimen experiences a truly three-dimensional, homogenous stress state comprised of a uniform axial stress in conjunction with radial and circumferential stresses equal to the negative of the pressure, -P. Through independent computer control of the pressure and axial stress, material behavior under a variety of multiaxial stress states is investigated. Experimental results obtained from conventional uniaxial and from triaxial monotonic and cyclic tests conducted using this unique apparatus are presented for carburized 4320 steel, hardened 4340 steel, nickel-titanium shape memory alloy and normalized 1070 steel. For the first three materials, stress state is shown to have a dramatic effect on the yield strength, the shape of the stress-strain curves and the phase transformation behavior. Pressure raised the fatigue strength of the 1070 steel, but did not affect the flow stress.
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