I attached my hip file. I want my object to break after frame 50 by setting the constraint strength to 0.

there are 2 options :
alt1 : using rbd constraint property, set the strength to : if($F>50, 0, -1)
alt2 : manually adding attributes then using wrangle for condition (break after frame 50)

both in the rbd bullet solver : I set 'override attribute' to 'strength'

When i play simulation, nothing happen after frame 50. What is the problem ?

your RBDs went to sleep after the default of 2s of not moving
so either increase the Sleeping Time or set it to 0

tamte
your RBDs went to sleep after the default of 2s of not moving
so either increase the Sleeping Time or set it to 0

Awesome. Thanks a lot.