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Difference between smooth step and ramp linearly over time for quasi-static analysis

Difference between smooth step and ramp linearly over time for quasi-static analysis

Difference between smooth step and ramp linearly over time for quasi-static analysis

(OP)
I'm conducting an implicit dynamic (quasi static) analysis.
My problem is actually static, but in some of my experiments, dynamic behaviour has occured. I have it displacement controlled by using a rigid plate

I can use in the step: Application: quasi static and then load variation
will change from instant to 'ramp linearly over time' or I can use smooth
step in the amplitude options (0 - 0 and 1 - 1) but what is the difference?

Whenever I select smooth step, my solution won't converge, but it will when I select quasi static application in the step. My results are now 1% - 3% off and
kinetic energy is less than 1% of the internal energy. But still curious what they would be with a smooth step IF there is any difference.

RE: Difference between smooth step and ramp linearly over time for quasi-static analysis

The amplitude types are explained in Users Manual 34.1.2 Amplitude curves

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