A. I. Gerasimov, E. V. Danzanova, G. V. Botvin
DETERMINATION OF THE FRACTURE TOUGHNESS LIMIT OF POLYPROPYLENE PIPES
At present, polypropylene pipes are most widely used in water supply systems. However, there are restrictions on the ambient temperature during their transportation. Thus, transportation, loading and unloading of polypropylene pipes are recommended to be carried out at an ambient temperature of at least minus 10 °C. Transportation is allowed at temperatures down to minus 20 °C, with fixation of pipes and observation of special precautions. This paper presents the results of testing samples of polypropylene pipes for crack resistance at different temperatures. The influence of the surface layer of the outer and inner walls of the pipes on fracture toughness is investigated. The results demonstrate that the removal of the surface layer from the inner wall of the pipe increases the value of the fracture toughness limit.
Keywords: polypropylene, fracture toughness limit, tension, incision, surface layer
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