What question did this study set out to answer?

To investigate the influence of hydrostatic pressures up to 8 kb on the tensile deformation, yield behaviour, and fracture of amorphous and semi-crystalline polymers, and correlate these responses with low-temperature properties.

August 1, 1971Philosophical magazine

The mechanical behaviour of polymers under high pressure

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Authors

ACAlfred W. ChristiansenUS Forest Service EBE. BaerCase Western Reserve University SRS. V. RadcliffeUniversity of Liverpool

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Implication

Experimental study demonstrates elevated yield stress and modulus under hydrostatic pressure up to 8 kb in polymers, indicating predictive links to low-temperature mechanics.

Key Points

To investigate the influence of hydrostatic pressures up to 8 kb on the tensile deformation, yield behaviour, and fracture of amorphous and semi-crystalline polymers, and correlate these responses with low-temperature properties.
Conducted tensile deformation testing on amorphous polymers (polycarbonate and poly(ethylene terephthalate)) and semi-crystalline polymers (polychlorotrifluoroethylene and polytetrafluoroethylene) under hydrostatic pressures up to 8 kb.
Performed atmospheric-pressure tensile tests on polycarbonate across low temperatures down to 116 K.
Fitted pressure-dependent yield stress data using modified von Mises and Mohr–Coulomb yield criteria and applied a pseudothermodynamic predictive equation.
Hydrostatic pressure consistently increased yield stress, yield strain, and elastic modulus while decreasing fracture strain in polycarbonate, poly(ethylene terephthalate), and polychlorotrifluoroethylene.
Polytetrafluoroethylene showed standard yielding trends up to 4 kb, beyond which yield stress and elastic modulus deviated due to a solid–solid phase transition and bulk modulus shifts near 5 kb.
Pressure-dependent yielding correlated with glass transition or melting temperatures, and low-temperature mechanical relaxation accurately predicted high-pressure ductile-to-brittle transitions.

Cite This Study

Christiansen et al. (1971) studied this question.

synapsesocial.com/papers/6a6f0179660549caf2c39865 https://doi.org/10.1080/14786437108227400

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Implication

Experimental study demonstrates elevated yield stress and modulus under hydrostatic pressure up to 8 kb in polymers, indicating predictive links to low-temperature mechanics.

The mechanical behaviour of polymers under high pressure

Discussion

Member takes

Implication

Key Points

Cite This Study

The mechanical behaviour of polymers under high pressure

Discussion

Member takes

Implication

Key Points

Cite This Study

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