Determining Volumetric Strain in Biaxial Deformation of PET at Temperatures and Strain Rates for Stretch Blow Moulding

James Nixon; Gary MENARY

doi:10.4028/www.scientific.net/KEM.651-653.869

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 651-653Determining Volumetric Strain in Biaxial...

Determining Volumetric Strain in Biaxial Deformation of PET at Temperatures and Strain Rates for Stretch Blow Moulding

Abstract:

For materials formed in the rubbery region eg. PET in the stretch blow moulding process, the normal assumption is that the material is incompressible. In this paper the validity of this assumption is challenged by conducting a series of experiments that measure the volumetric strain under different strain and temperature histories. Experiments have been conducted on a biaxial testing machine instrumented with lasers for measuring the strain through the thickness in combination with and digital image correlation for measuring the in plane strain for PET stretched in uniaxial and biaxial deformation between 90°C and 100°C. Results will be presented that show that the Poisson’s ratio for PET can vary between 0.4 and 0.55 depending on the test conditions. It is concluded that the values measured greater than 0.5 are due to the strain induced crystallinity that occurs with PET during the biaxial deformation process.______________________________________________________________________

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Periodical:

Key Engineering Materials (Volumes 651-653)

Pages:

869-873

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.651-653.869

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Online since:

July 2015

Authors:

James Nixon, Gary MENARY*

Keywords:

PET, Poisson’s Ratio, Simulation, Stretch Blow Moulding, Viscoelastic

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References

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