Disclaimer: I'm not a programming expert.
Encapsulate as it's used in programming means to take various disparate data items and corral them into a unit that is treated as one unit, or always in reference to the root unit.
Objects encapsulate data items (or members) which can consist of:
So ...
To un-encapsulate an object might mean you'd re-instantiate each data item as its own instance and no longer associate it with the object type. If you are doing this you have some weird type of cast going on or are doing something like accessing the object through a C-style union
that lets you get at the members. This is probably not common enough to give it a distinct name.
Or, you might do something weird like define a derived class, inherit the base object, and null out various methods or variables on the dervied object. This is probably not common enough to give it a distinct name. It might not even really be possible without hacks.
If you mean building a new object with different constitutents, un-encapsulate would be the word.
If you are talking about things that don't respect the boundaries of an encapsulation or abstraction/object model, you can say those actions break encapsulation or break the model.