Browsing by Author "M. Mohellebi"

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    COMPARATİVE STUDY OF THE MECHANİCAL BEHAVİOUR OF THE ABS POLYMER: İNJECTİON PRESS-3D PRİNTİNG
    (2019-12-17) F. Djeddi; M. Mohellebi
    Plastic processing techniques depend on the nature of the polymers and on the destination of the finished products. To improve the productivity of plastics and their performance, the industrial world has given great importance to the evolution of these transformation techniques. Our work is a comparative study of the mechanical behavior of a polymer (ABS) in two different processing techniques: press injection and 3D printing. Plastic injection uses the thermoplastic properties of the polymer, to inject it softened into a mold, in order to create a footprint of it. This technique provides the best quality for productions of large and very large series.3D printing, also called additive manufacturing or direct digital manufacturing, allows making an object by creating a numerical model and printing it in three dimensions. It opens a wide range of technical possibilities with important economic stakes. Used mainly for prototyping, its potential applications are now of interest to many sectors of activity: aeronautics, automobile, medical, .... The melt flew index of the ABS used is 22.32 g / 10 min, the mode of transformation chosen, which is the injection, is in agreement with our material. The mechanical behavior of test pieces made by the two processes is different. The stress and strain characteristics are significantly higher in the conventional injection process than in the case of 3D printing. The values of modulus of elasticity and maximum stress decrease significantly in the 3D printing process. Micrographs obtained by optical microscope and scanning electron microscope observations (MEB) of fracture facies during tensile test show a big difference in the cohesion of the material between the two processes. The results obtained show that the transformation mode has a direct influence on the mechanical characteristics of the polymer. The mechanical characteristics required of the finished product impose the mode of transformation of the polymer..