You misunderstand how the effect works. It's a (pseudo-)simulation, not a static geometry deformer. The forces affecting the shards are accumulative and unless you use other forces to counter them, the initial impuls and energy will be conserved. your only way to freeze stuff is to pre-compose and time-remap.
Yeah.. makes sense. Wonder why they made it keyable though. Just ads to the confusion if you can't use it.
But thanks.. now I know how to go around it.
You can keyframe the strength to speed things up, but if you want to slow things down you need to keyframe viscosity. Take a look at this example that uses a comp camera, a mask path for the path of force 1 and throws in viscosity at the end to slow things down.
That's actually how I solved it.. I just animated the visconsity and it worked fine.. thanks.
Shatter's inventor, Brian Maffitt, explains it all for you on youtube in two hours of very cool stuff. Even with all the 3D features being added to AE, Shatter remains one of my favorite tools for lots of unexpected simulations and fly through effects