The Waste Package Project. Final report, July 1, 1995--February 27, 1996: Volume 1, The structural performance of the shell and fuel rods of a high level nuclear waste container Page: 15 of 94
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numerical and experimental study on the denting and subsequent axial compression of tubular
members. The finite element method was used to quantify the effect of damage induced residual
stresses. The possibility of modeling the dent damage by using an idealized model of the dent is also
investigated. They tried to define the dent profile in the axial direction as a constant gradient, linear
gradient and in an exponential form. In the proposed research, since the curvature of the dent will
be related to the maximum strains as measured by the strain gages, the dent profile will be defined
using a Lagrange interpolation of the strains. Ricles et.al. (1992) tested six steel tubular braces with
dent damage and various diameter to thickness ratios to examine their residual strength under direct
axial loading, and combined axial and flexural loading, they found that a dent depth of 10% of the
member's diameter would significantly reduce the member's compressive strength in the axial
direction. Fatt et.al. (1992) studied the impact damage of long plastic cylinders theoretically, they
made assumptions on the cross-sectional deformed shape of the cylinder and reduced the two-
dimensional shell problem into a one-dimensional problem of a plastic string resting on a rigid plastic
foundation. In this work, the instantaneous velocity and deflection profiles, the final deformed shape
of the shell and the maximum deflection attainable under impact were calculated. A parametric study
was performed by changing the mass and velocity of the impacting object over several orders of
magnitude. An approximation to the dynamic solution was also obtained by using the solution of the
shell under knife edge loading and by comparing the plastic work of the deformation process to the
kinetic energy of the impacting mass. Stronge (1993) studied the impact on metal tubes for both,
indentation and penetration. He showed that the end constraints significantly affect local indentation
if the indentation is only a few diameters from the end. Stronge also specifies an yield condition in
terms of bending moment, axial membrane force, plastic bending moment, and plastic membrane force7
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Ladkany, S.G. & Rajagopalan, R. The Waste Package Project. Final report, July 1, 1995--February 27, 1996: Volume 1, The structural performance of the shell and fuel rods of a high level nuclear waste container, thesis or dissertation, June 1, 1996; United States. (https://digital.library.unt.edu/ark:/67531/metadc672272/m1/15/: accessed March 29, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.