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scan0038 - Simulation II 5—21 Rough Similar to the...

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Unformatted text preview: Simulation II 5—21 . Rough: Similar to the frictionless setting, this setting mbdels perfectly rough frictional contact where there is no sliding. It only applies to regions of faces. By default, no automatic closing of gaps is performed. This case corresponds to an infinite friction coefficient between the contacting bodies. . Frictional: In this setting, two contacting faces can carry shear stresses up to a certain magnitude across their interface before they start sliding relative to each other. It only applies to regions of faces. This state is known as “sticking.” The model defines an equivalent shear stress at which sliding on the face begins as a fraction of the contact pressure. Once the shear stress is exceeded, the two faces will slide relative to each other. The coefficient of friction can be any non—negative value. Choosing the appropriate contact type depends on the type of problem you are trying to solve. If modeling the ability of bodies to separate or open slightly is important and/or obtaining the stresses very near a contact interface is important, consider using one of the nonlinear contact types (Frictionless, Rough, Frictional), which can model gaps and more accurately model the true area of contact. However, using these contact types usually results in longer solution times and can have possible convergence problems due to the contact nonlinearity. lf convergence problems arise or if determining the exact area of contact is critical, consider using a finer mesh (using the Sizing control) on the contact faces or edges.” We will focus in our example on the pin contacting the slots in the yoke fingers and the stress in the yoke. Since the tensile loading can be assumed to maintain contact between these two surfaces, the No Separation model seems most appropriate. And since No Separation allows for small amounts of sliding along the contacting surfaces, we will use that model for the fingers contacting the sides of the stern as well. If we assume that the pin is tightly fit into the hole in the stem, Bonded is an appropriate choice for this contacting pair. These choices result in linear models that solve rather quickly. If more detail is desired at the pin-yoke contact surface, one of the nonlinear contact models can be used. 7. Set the contact types to No Separation, No Separation, Bonded. (Your order may be different.) Restrict the Yoke from motion in the X Direction and Apply a -1000 psi pressure to the Stem also in the X Direction. The stem cross sectional area is 2 sq. inches, so this corresponds to a tensile load of 2,000 lbf. ...
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