La ductilitat es una proprietat mecanica que designa la capacitat d'un materiau de s'estirar (deformacion plastica) sensa se rompre.
La rompedura a luòc quand un defaus (fissura ò cavitat) vèn critic e se propaga. Un materiau amb una ductibilitat importanta es dich ductile. Dins lo cas contrari, es considerat coma fragile.
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