Examples from the Web for armour plate
Its thick hide studded with bosses was like armour-plate, and over its back impenetrable to bullets.Life in an Indian Outpost|Gordon Casserly
Arnold smiled back at her, and she saw recognition leap through the armour-plate of his ecclesiasticism.Hilda|Sarah Jeanette Duncan
Besides, I'd like to take off this armour-plate of mine and get comfortable.Cheerful--By Request|Edna Ferber
Permanent Splashes left where a Projectile has entered an Armour-plate.A Study of Splashes|Arthur Mason Worthington
What armour-plate could ever resist a projectile of 30,000 lbs.