Abstract
This paper analyzes the indentation hardness and the indentation elastic modulus variation depending on the variation of the grind percentage of polymer, when the other factors that can influence the injection molding remain unchanged. The analyzed polymers were: acrylonitrile butadiene styrene ABS MAGNUM 3453, polyamide PA 6.6 TECHNYL AR218V30 Blak and polyoxymethylene POM EUROTAL C9 NAT. The samples that were studied had different compositions in new and grinding material. The G-Series Basic Hardness Modulus at a Depth method was used. The increase of the grind percentage of ABS (from 0 to 100 %) leads to insignificant changes in the indentation hardness, indentation modulus, and maximum force applied to samples of tested material. The maximum hardness (0.137 GPa) of PA 6.6 is recorded in the case of the sample with 80% grind content, and the maximum hardness of POM is recorded as well in the case of the sample with 80% grind content, as being 0.215 GPa. The variation of the grind content in the analyzed samples determines changes in the evaluated parameters, depending on the type of polymer. Combining the new material with grind in proportions experimentally established for each techno polymer leads to changes in their mechanical properties.
Highlights
The automotive industry is considered one of the largest consumers of plastic/polymers materials
Polyamides are substances characterized by a good dimensional stability, with a high level of rigidity; they are resistant to compression, wear, shock and vibration; being hard materials, under the action of heat, they remain hard and tenacious, with no visible changes, up to 80-90°C [1,2]
The determination of the indentation modulus and indentation hardness was realized on the specimen models, with the shape and size of those presented in figure 2
Summary
The automotive industry is considered one of the largest consumers of plastic/polymers materials. Polyamides have the proprieties to resist well in salted water, to be stable vs oil, hydrocarbons, lakes, esters, ethers, weak bases, alcohols, and automotive fuels. They are considered good electrical insulators, as well. The high degree of crystallinity gives the polyoxymethylenes some general mechanical properties (especially stiffness), higher than in the case of other thermoplastics, between 50-120°C They are resistant to shocks, fatigue, friction and wear. ABS is stiff, wear-resistant, resistant to mechanical stress at break, has a good dimensional stability over a wide temperature range, unlimited coloring possibilities, easy injection molding [5] and it is a good electrical insulator. Applications in the automotive industry: seat components, bumpers, carcasses for electrical and electronic assemblies, roof car truck, etc
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