Abstract
This paper presents a approach to determining the level of damage on rigid PVC pipes (polyvinyl chloride), destined for the supply of drinking water, and previously subjected to quasi-static impact. The originality of the work has been to experimentally characterize the level of damage via readily measurable physical quantities obtained under operating conditions. For this purpose, a wide range of experiments were performed. Firstly, trials involving impact with a hemispherical-end hammer weighing 16kg, dropped from a height of between 0 - 2m on portions of rigid PVC pipe. Thereafter, the dimensions of the affected area on the portions of the pipe are measured using a Tridimensional Measuring Machine (TMM). Finally, tensile tests on flat test pieces from around the impacted area of the pipe section were used to determine the post-impact residual mechanical strength. This investigation on post-impact properties allows the definition of the level of damage reached via the unified theory model of Bui Quoc. By analogy to the latter, the damage is expressed as a function of the area of the impacted section.
Highlights
Plastic materials occupy a large part of the drinking water supply pipelines due to its easy of installation and relatively low costs
This paper presents a approach to determining the level of damage on rigid PVC pipes, destined for the supply of drinking water, and previously subjected to quasi-static impact
Impact tests using a 16kg mass dropped from different heights, have enabled the observation of bleaching of the area of the affected zone
Summary
Plastic materials occupy a large part of the drinking water supply pipelines due to its easy of installation and relatively low costs. Drinking water supply pipes are often subject to accidental impacts such as pebbles drops, scratches etc., during their installation. An estimate of the level of damage of the material is necessary. There exists, in literature, different damage models that predict, for a given stress, the level of damage of the material [3, 4, 5]. Most of these models are based on difficultly measurable quantities during operating conditions. The aim of this work is to propose a simple and fast approach to constructors that will enable them to assess the level of damage of pipes subjected to impact. An analysis and a comparison of the defined damage are presented in the last part of the article
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