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I don't know how to describe my problem, so I'll post a gif of my problem first:

enter image description here

As you can see, the shrapnels don't seem to have a hitbox. They collide with the plane, but instead of flipping around on the ground like tiny metal plates, they just rotate in place at their center point.

How do I fix this problem? (I created this animation using Quick Explosion) Thanks in advance!

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You can't fix that with QuickExplosion.

Since its based on particles, only particle as point (placed in centre of each piece) collides. Maximum you can get is spherical boundary so they stay more above surface, but they will still rotate and boundary will be the same size for all shards = some will levitate some still partialy under surface. From this answer it seems you can make it better.

enter image description here

To make it work properly you will need to use Rigid Body simulation for shards done with Fracture Cell addon or beter via Fracture modifier (that is not include officially in 2.8x for now).

Some older tips you can find here

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