RECOVERING OF THE MECHANICAL PROPERTIES OF A PEHD PLATE CONTAINING A NOTCH BY THE GRINDING TECHNIQUE

Abstract

In this work, we present a repair approach of HDPE pipes. We use for this goal, a single Edge notched tension (SENT) samples with different notches lengths. We observe, in the first part, that the shapes of the force displacement curve change when the specimen contains a notch comparing to the tensile test of the plates without a notch and in the second part that the area value of the specimens decreases with the increase of the notch length. This area under the force-displacement curve represent the material deformation potential and the decrease of this energy indicate that the material loss his deformation potential in the presence of a notch. The aim of our contribution is to propose a rehabilitation method of the material deformation potential based on the mater removal around the notch by the grinding technique. We show that the recovering of the deformation potential of the material is possible by using this method. We, also, show that the mechanical properties of the material are better when the grinding well is bigger. To finish, we propose a recovering efficacy criterion based on the determination of the optimal value of (where is the notch length and is the width of the sample), at eight percent (80%) of mechanical properties recovering, beyond witch the rehabilitation is ineffective.