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  • Thermomechanical characteri...
    Song, Peihao; Trivedi, Akash; Hawkins, Nicholas; Graham, Aaron; Chapman, David; Siviour, Clive R.

    Polymer (Guilford), 04/2024, Letnik: 300
    Journal Article

    Polyamide 6 is a widely used engineering plastic; however, its thermomechanical properties are not well understood, particularly at medium and high strain rates. In this research, the thermomechanical properties of Polyamide 6 were extensively characterized. Differential Scanning Calorimetry was performed to investigate the glass transition temperature and crystallinity. Frequency sweep Dynamic Mechanical Analysis was carried out through the secondary- and glass-transitions, and the temperature dependent storage moduli obtained from different sweep frequencies were used to construct a master curve. Quasi-static tensile tests at two loading speeds were conducted with digital image correlation for full-field strain mapping. Compression properties were measured at strain rates between 0.001 and 6000 s−1 at room temperature, and temperatures between −60 and 200 °C at 0.01 s−1. The mechanical response is highly rate- and temperature-dependent; at large strains and elevated rates, apparent softening occurs owing to heat generation, which was quantified using an infrared camera. Display omitted •Polyamide 6 characterised from −60 to 200 °C and 0.001–6000 s−1 in compression.•Tensile tests performed with digital image correlation.•High speed infrared camera measured temperature rise in compression.•Time-temperature equivalence gives insights into rate dependence.