Dynamic Compaction Simulation by ABAQUS

Greeting Everyone, I’m a new user of ABAQUS. I’m trying to simulate soil dynamic compaction by Cap model. I simulated the blow by half sinusoidal wave. Although I used Cap model and entered the hardening table, the soil still behaves in the elastic state (as the image show) during 15 blows. Also, the incremental crater depth for each blow should be smaller than the previous but that didn’t happen.

Do you have any tip of advice, professor David Mašín?
What should I do to improve my model?