You cannot use a force load with a force per unit area distribution on a geometric entity that you midsurface compress to another type of geometric entity. For example, if you decide to model the following rectangular plate as a shell, Creo Simulate would display a warning indicating that you need to redefine the problem load.

If you applied the load with a force per unit of length distribution to the top or bottom curve for the surface shown above, Creo Simulate would keep the load. If you loaded both the top and bottom curve, Creo Simulate would calculate the compressed load based on the value of both loads.

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