Tenacity as well as a trait in people who would indicate the effort constant, oblivious to discouragement, to achieve the end that pursued, can be a feature that scientists attribute to materials and is the resistance that oppose, on the basis of their nature or the cohesion of its molecules, to be cracked, deformed or destroyed. Scientists define it as total deforming energy that can absorb and accumulate before reaching the break by impact or accumulation of dislocations.