La tenacidad ( propiedad inversa a la fragilidad) se define como la capacidad que tiene un material para almacenar energía en forma, por lo general, de deformación plástica antes de romperse.
Un material muy tenaz se deformará en gran medida antes de producirse una rotura; en cambio, un material frágil, o poco tenaz, apenas experimentará deformación alguna.
El más característico es el ensayo Charpy . En este ensayo se utiliza una probeta de sección cuadrada
provista de una entalladura que es sometida a la acción de una carga de ruptura por medio de un martillo que se desplaza en una trayectoria circular.
La energía absorbida por la ruptura se llama resiliencia ρ y su unidad en el sistema internacional es el J/m2
Ep =m⋅g(H −h) Energía potencia absorbida en la ruptura en Julios (J)
ρ= Ep/ Ao
m = Masa del martillo en kg
g = Gravedad terrestre 9,8 m/s2
H = Altura desde la que cae el martillo en metros (m)
h = Altura que alcanza el martillo después de romper la probeta en metros (m)
ρ= Resiliencia en Julios por metro cuadrado (J/m2)
Ao = Sección de la probeta por la parte de entalladura en metros cuadrados (m2)
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