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An impact tensile testing apparatus with cantilever type load cell was developed for obtaining stress-strain curves of polyester multi-filament yarn at various strain rates. The experimental results were compared with the numerical results derived from an over-stress theory. By using this apparatus, tensile tests of yarn at wide range of strain rate from 10-3 to 102s-1 could be performed in the same measuring system. The over-stress theory gave satisfactory interpretation of the stress-strain curves of polyester multi-filament yarn up to breaking point at low strain rate, and up to yielding point at high strain rate. The difference between the calcurated curve and experimental results at high strain rate seemed due to the temperature rise of yarn during extension.

Stress-strain curve in polyester filament yarn for tensile deformation at high rates.