Abstract
Lately, PP-R pipes have become increasingly popular in terms of drinking water installations and heating. Comparated to the classic pipes from copper or steel, pipes from propylene are much easier to use, they have obvious qualities and they are marketed at a much lower price. The study aims a comparative analysis of the physical-mechanical properties of the four most common types of pipes from propylene, which are currently found in commerce : simple without insertion(PP-R), with insert of composite fiber (PP-R-CF), with insert of basalt fiber (PP-R-BF) and with insert of aluminium (PP-R-AIF). Experimental research showed that from the point of view of thermal expansion, the best behavior is from the pipes from propylene without any insert and the value of the thermal expansion coefficient for the reinforcement pipe with basaltic fiber is very small. After these attempts at tensile, it resulted that all four samples which were analyzed from the point of view of the tensile strength, don�t exceed the limit that was given by the manufacturer (10-30 MPa), the values obtained being: for pipe from polypropylene of 17 MPa, for pipe from polypropylene with insert of aluminium of 18 MPa, for the test tube from pipe of polypropylene with insert of basalt fiber of 29 MPa and for the test tube from pipe of polypropylene with insert of composite fiber of 30 MPa. Therefore, from the point of view of the behavior at tensile and bending, the best behavior is from the pipes from polypropylene with insert of basalt fiber and pipes from polypropylene with insert of composite fiber.
Highlights
The economic-industrial competitiveness will always impose ways on how to obtain your products, with high technical parameters, to which the functional characteristics are combined with complete exploitation of materials properties
The presentation aims to analyze the behavior of the four types of PP-R pipes mentioned, to physicomechanical stresses, such as thermal expansion, tensile and bending, knowing that, before breaking, the values obtained for the simple tensile or repeated tensile cycles, deformations and necking, depend on the following factors: the type of pipe, the time of action of the force, the speed of loading; number of cycles and temperature in the piece
From the determinations and measurements made in this presentation, where the thermal expansion and behavior to mechanical stress of polypropylene pipes were studied, it was aimed at highlighting the behavior of polypropylene in various forms so simple as well as with different inserts
Summary
The economic-industrial competitiveness will always impose ways on how to obtain your products, with high technical parameters, to which the functional characteristics are combined with complete exploitation of materials properties. This can be realized by using high generation materials, with a better machinability and made through new or improved technologies, adapted to the new needs of humanity.
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