When employing a non associated flow rule, principles proposed by Drucker Drucker 1950, Drucker 1951 are not fulfilled in regards to local material stability. However, such conditions are not strictly required Mroz 1963 and they do allow us to obtain results derived from experimental tests.
Al utilizar una regla de flujo no asociada no se satisfacen los postulados de Drucker Drucker 1950, Drucker 1951 sobre estabilidad local del material, sin embargo tales condiciones no son estrictamente necesarias Mroz 1963 y si permiten obtener resultados derivados de los ensayos experimentales.