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The Behavior of Plastics under Various Tensile Test Speeds - Development and Application of a Testing Machine for Producing High Loading Rates

The mechanical properties of polymers depend to a greater extent on the temperature and strain rate than many other materials. The loading rates of conventional tensile testing machine are 0,033 m / s. To determine the stress-strain behavior even at faster strain can, a high tensile test machine with strain rates ranging from 1 to 50 m / s was developed and thereby allows a speed range of 6.5 orders of magnitude. In conventional sample geometries are strain rate of approximately 10-2 to 105 (%/s) are possible. Force, strain and by integration of stress-strain curves the absorbed energy can be determined.

Tested are PA, ABS, PC, PMMA, PE, PVC, CAB and PU elastomers in the temperature range from -40 to + 140 ° C. Generally the tensile strength will increase with strain rate and the elongation at break. For the type of plastic-based high strain rates, there is brittle failure. Increased speeds have the same effect as decreased temperatures.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Karl Oberbach

Karl Oberbach
Fakultät für Maschinenwesen
Rheinisch-Westfälische Technische Hochschule Aachen

Information

Free keywords: Tensile Testing Machine, Strain Rate, Tensile Strength, Yield Strength, Elongation, Permanent Elongation, Energy Absorption, Brittle Fracture
Institute / chair: Fakultät für Maschinenwesen der RWTH Aachen
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. F. Bollenrath (Betreuer), Prof. Dr.-Ing. K. Krekeler
Publication year: 1965
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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In cooperation with the Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK), we provide free access to current dissertations in the field of plastics technology.

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