Interface defeat is when a ceramic armour system, typically on an armoured fighting vehicle, defeats a kinetic energy penetrator at the ceramic's front surface. Above a certain impact velocity, known as the transition velocity, interface defeat can no longer occur and either penetration or perforation of the ceramic occurs.

References

• Lundberg, Patrik (2004). "Interface Defeat and Penetration: Two Modes of Interaction between Metallic Projectiles and Ceramic Targets" (PDF). Acta Universitatis Upsaliensis. Retrieved 2016-10-03. {{cite journal}}: Cite journal requires |journal= (help)