Interpenetration

Interpenetration occurs when two or more solid objects occupy the same space at the same time, blending or overlapping in a way that their boundaries intersect. In materials science and mechanics, it refers to the way different structures or components interlock or integrate within a shared volume, often enhancing stability or function. For instance, in composite materials, fibers and matrix materials interpenetrate to form a strong, unified structure. While physical objects can't truly pass through one another without damage, interpenetration describes how their regions overlap or interleave, often leading to improved mechanical properties or complex interactions.