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Example 2 - Snap-thru Roof |
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Example 2 - Snap-thru Roof |
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A snap-through problem is studied on a shallow cylindrical roof upon which an imposed velocity is applied at its mid-point. The characteristic curve, caused by the limit load and achieved by simulation is compared to a reference. This example is considered a static problem.
Only one-quarter of the structure is taken into consideration and adequate boundary conditions are applied on the model sides.
The problem is solved using two different approaches:
| • | An analysis by an explicit solver |
| • | An analysis by an implicit solver |
The implicit strategy uses the arc-length method with a time step limitation. The RADIOSS implicit options are defined in the modeling description.
The simulations using explicit and implicit methods provide accurate results with a good evaluation of the limit load experimentally observed. A time step control with a low value is required in order to describe the nonlinear path of the load displacement curve. Both computations converge toward a single solution.
