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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2008

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Influence of polymer samples preparation procedure on their mechanical properties

Żenkiewicz M., Richert J.

Journal of Achievements in Materials and Manufacturing Engineering

2008

Vol. 26, nr 2

155-158

Purpose: The aim of this paper is to study the effect of the preparation procedure for the samples of five engineering polymers on the values of offset yield stress at 0.2% strain (σ02), tensile stress at yield (σy), and tensile stress at break (σB) as well as tensile strain at yield (εy) and tensile strain at break (εB). Design/methodology/approach: A single-screw extruder was used to obtain films from which one group of measuring samples was cut out. Another group of these samples was obtained by injection moulding, using a laboratory injection moulding press with a 200-MPa nominal injection pressure. Determination of the material strength under static tension was performed using a tensile testing machine. Findings: The values of the three characteristics stresses (σ02, σy, and σB) for the injected samples of all the studied polymers are greater than those for the extruded ones, the largest differences on average being in case of σy. Tensile strains (εy and εB) for the extruded samples are always greater than those for the injected ones. Research limitations/implications: The observed differences in mechanical properties result from different structures of the sample materials, caused by different respective production technologies. Detailed discussion on these differences and determination of quantitative relationships between them and the mechanical properties require further investigation. Practical implications: It is necessary to obey precision and caution while analysing and comparing the data acquired at various laboratories. In order to draw correct conclusions from such analyses, the respective samples have to be prepared and examined in a similar way. Originality/value: The values of characteristics stresses (σ02, σy, and σB) determined for all five polymers are much greater then those for the corresponding extruded ones.