Mechanical Properties of Ps Injected Parts Under Surface-Active Substances

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Mechanical properties of PS injected parts under surface-active substances

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MECHANICAL PROPERTIES OF PS INJECTED PARTS UNDER SURFACEACTIVE SUBSTANCES
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The main objective of this work was to develop the influence of surface-active substances in the mechanical properties of injected plastic parts in presence of cracks, a tension test and a constant load. The material used was Polystyrene and the surface-active substances were olive oil and corporal sweat. This study was conducted because it was observed that the surface-active substances affects the mechanical properties of the resin as well as the presence of cracks, and actually is not reported any methodology for conducting this study.

Experimental Part
For this study, there were injected 110.5*85.5*1 mm plates in a REED-Prentice 100 TE (Clamp Force = 100 ton) injection machine with an injection mold with two similar cavities, but with a different located entrance. The used material was a Polystyrene PS-2820 from Estirenos del Zulia (Table 1). In table 2 are showed the used optimal process conditions. Notches were mechanized in each plate with a saw. The normalized tensile test specimens were cut with a milling machine. It was used a Galdabini 2500 universal test machine to make mechanical tests, and a Starrett Sigma VB300 stereoscopic magnifying glass to verify the crack length. To study the crack surface it was used a Macro Magnifying glass Olympus SZ61. To study the orientation and the stress concentrator in the plaques it was used a polaryscope Photoelastic Inc. 082.

Introduction
Since long time ago, the fracture has been a serious problem for the use of all materials. The fracture may be described how any change of the…...

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