Task: Translation
Input (Spanish): The test tube has an original design, which may have two recesses: the first recess is located at the central portion of the tube, the same being sharper where the fatigue resistance of the material is measured; the second recess being optional, thus may be located at the free end portion of the test tube where a load pre-evaluated by numerical simulation is located.
Output (English): El diseño de la probeta es un diseño original que puede presentar dos depresiones: una en la parte central siempre presente y más pronunciada donde se mide la resistencia a la fatiga del material; la segunda, no siempre presente, en el extremo libre de la probeta donde se puede colocar una carga preevaluada mediante simulación numérica.