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Unformatted text preview: tions and Modeling Notes
The problem is solved first using 2-D viscoelastic elements (VISCO88) and then using 3-D viscoelastic elements
In the 2-D case, due to the fact that the stresses will be the same in X and Z directions because of symmetry, an
axisymmetric analysis is performed with the nodal degrees of freedom coupled in appropriate directions. The
radial thickness of 0.2 cm is arbitrarily selected. Nodes 21 through 25 are coupled in the X-direction (radial
coupling). Nodes with the same Y-location are coupled in Y-direction (axial coupling).
In the 3-D case, an arbitrary thickness of 0.2 cm is assumed in both Y and Z directions. Nodal degrees of freedom
are coupled in appropriate directions to simulate the correct physical behavior in the finite element model.
The alumina is not a viscoelastic material, however, its material properties are input using viscoelastic format so
that only one element type (VISCO88 in 2-D and VISCO89 in 3-D) can be used for both materials. Also, note that
the viscoelastic material does not require the MP command for inputting t...
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- Spring '09
- The Land