Re:Best wat to stop a crack... (Score 1)

actually, yes and no. the cracks they are talking about start out initially a few nanometers in length. They are also typically internal. BUT, there are many composites which include nodules of a glue-like substance and nodules of a catalyst that enables the glue to harden. SO the idea is, a crack in the material forms. When it propagates, it hits a glue nod, and breaks it open. the glue expands and fills the crack. The catalyst activates the glue and hardens it, effectively stopping the crack from propagating further. (also stopping any further dislocations/crack that try to cross the "fixed" zone)