Can you give real examples for plain strain and plain stresses in finite element analysis?

Briefly examples for plane stress in finite element analysis are thin plates, white examples for plane strain are long structures with fixed cross-sections like box culverts.

in addition to the previouse answer:

examples for plain strain are Dams and pipes subjected to load that remain constant over their length.

while examples for plane stress are plate with holes , fillet or other change in geomatery that are loaded in their plane resulting in local stress concentration.