I am doing 3pt bending test in LS-Dyna with a glassfibre-epoxy sample. So it is a non-linear dynamic (quasi static) problem. I assume it is a implicit problem since the event is slower and the effects of strain rates are minimal. But my professor used explicit control card to solve this. what difference can it give?
Explicit solver can be used for modelling slow problems if you use appropriate time scaling or mass scaling.
Without the scaling, the run time will be very long since the load is applied at a very slow rate. And with too much scaling, the results will be incorrect.
When you say he used Explicit, I assume that he used explicit solver with the actually loading rate.
Strain rate effects are related to the rate of displacement or deformation....not whether it is implicit solver or explicit. You still can simulation dynamic problems with implicit analysis and model quasi-static events with explicit, but you need to know what are the suitable keywords to add in both cases.
Here is how I did 3-point bending. I used explicit because I wanted to apply a dynamic load
https://youtu.be/4VPQVCk5F3A
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