Method for evaluating quality of rough surface of sectile rod for internal combustion engine of car, involves defining set of items on rough surface, and determining slope between points of surface, where items form nodes of grid on surface

The method involves defining a set of items (18) on a rough surface (14), where the items form nodes of a grid on the rough surface. A slope is determined between two points of the rough surface. An irregularity of the rough surface is determined according to the determined slope, where the rough surface is regarded as irregular when the irregularity of the rough surface is greater than a threshold value. The grid is provided with a set of meshes defined by edges (50) connecting the items. An independent claim is also included for an assembly for evaluating quality of a rough surface of a sectile rod for an internal combustion engine of a car. L'invention concerne un procédé d'évaluation de la qualité d'une surface de rupture (14), notamment d'une surface de rupture d'une bielle sécable (10) pour moteur à combustion interne d'un véhicule automobile, comprenant une étape consistant à déterminer une pente entre deux points de la surface de rupture (14).