Depending on your PC+ABS composition, you can find very accurate stress-strain curves online.
Try to find the main supplier's website - whichever company your current company buys them from. Or ask directly to the supplier to provide this data for you.
Stress-Life curves are mostly hard to find from those suppliers, but they most likely will have the stress-strain data as it is an easy test to retrieve those.
Don't know about chrome plated ABS. But had Aluminum+Steel Clad before. Aluminum+Steel would be modeled as either duplicate elements sharing the same nodes, or composite modeling with plies on a single layer of elements.
Chrome+ABS experienced FEA guys, please advise.
Spaceship!!
Aerospace Engineer, M.Sc. / Aircraft Stress Engineer