Sabal Panthee Why are you using a dynamic explicit solver? The distortion suggests that the mesh might not be accurate, or perhaps the solver algorithm isn’t suitable. Could you explain in more detail why you’ve chosen the explicit solver? Abaqus can be quite complex if its workings aren’t fully understood. Send me a personal message on WhatsApp explaining your reasoning; https://wa.me/+923440907874.

1. Reduce Time Step: Lower the time step size to avoid exceeding the critical time step.

2. Refine Mesh: Increase mesh density, especially around high-stress regions.

3. Check Material Model: Use a suitable concrete model (e.g. Concrete Damage Plasticity) and ensure correct material parameters.

4. Improve Contact Definitions: Use hard or surface-to-surface contact with proper friction and possibly add damping.

5. Use Mass Scaling: If used, keep mass scaling small to stabilize without affecting results.

6. Add Artificial Damping: Apply small artificial damping to improve stability.

7. Prevent Rigid Body Motion: Properly constrain all degrees of freedom to avoid instability.

8. Check Element Types: Use solid elements (e.g., C3D8) with appropriate formulations.

9. Gradual Load Application: Ramp uploading gradually to avoid sudden force application.

You can define a proper mass-scaling in step module and also use refine mesh too.

Hello. You are programming models from various materials. Did I understand you correctly?