Finite-element stress and deflection analysis of CDF yoke and end plug Page: 4 of 49
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TM—1113
4
Table II summarizes the materials used in yoke construction
and their properties.
B. The Finite Element Models
The two models used in this analysis are shown in Fig. 2
and Fig. 3. These models differ only in the feet used for yoke
support. Due to geometric and load symmetry, only one-quarter of
the structure was modeled. The frame, ring, return legs, and
feet were modeled with eight node hex elements (ANSYS STIF45).
This is an incompatible element with extra shape functions which
allow the element to assume a parabolic deformation. Three
elements through the thickness of frame and ring were chosen both
as a modeling convenience and to accuractely represent bending in
these components.
The stainless backing plate, ribs, main diagonals, and
inserts were modeled with four node plate elements (ANSYS
STIF63). This element allows a cubic out of plane deformation,
and, with incompatible shape functions, a parabolic in-plane
deformation.
The difference in order of displacement fields can result in
incompatibilities between plates and solids when the two are used
in the same model. Also, rotational degrees of freedom are not
associated with the three-dimensional solid elements (since no
plate or beam type bending strain energy approximations are used
in the stiffness formulation). This results in no transfer of
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Wands, R.; Grimson, J.; Kephart, R. & Theriot, D. Finite-element stress and deflection analysis of CDF yoke and end plug, report, May 24, 1982; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1072751/m1/4/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.