effect of Capacitor when dc voltage source connected to it
One the capacitor is fully charged, theoretically it will act like an open circuit. As no DC is able to pass, there will be no current flow and the voltage on the capacitor will be equal to the supply. Of course, in real life there will be a small amount of leakage and the voltage will never be exactly equal!

Anyhow, to answer the question, yes. In a DC application, once a capacitor is fully charged, it acts like an open circuit.