بوقرة, رابحقريد, مصطفى2018-10-182018-10-1820111112-8984http://dspace.univ-msila.dz:8080//xmlui/handle/123456789/5998Despite the limited measures adopted to replace easy-to-damage in the machine, which extends from the moment of emergence of sings of erosion and so forth until its breaking, and therefore, it poses the problematic of multiple choices. In this paper we will discuss a mathematical model adopted to resolve this confusion with an attempt to apply it to some parts that feature ease of fracture described in the brood of the CERED Mills of M'sila.Orationalization of costs, maintenance costs, the probabilistic modelm.Article