Abstract
The mechanical properties of polyethylene (PE) materials are greatly influenced by their molecular structures, environmental temperature, and strain rate. In this study, static and dynamic compression tests were performed on two semicrystalline PE materials—ultrahigh molecular weight polyethylene (UHMWPE) and high-density polyethylene (HDPE). The stress–strain curves of HDPE and UHMWPE under uniaxial compression at temperatures of −40–120 °C and strain rates of 0.001–5500 s−1 were obtained. The research findings suggest that both the UHMWPE and HDPE showed significant strain rate-strengthening effect and temperature-softening effect. In particular, HDPE exhibited better compression resistance and high-temperature resistance. The relationships between the yield stress and temperature and between the yield stress and strain rate for both materials were fitted, and the Cowper–Symonds constitutive model was built while considering the temperature effect. The parameters of the constitutive model were obtained and input into LS-DYNA software to simulate the dynamic compression process of HDPE. The simulation result was consistent with the test result, validating the accuracy of the constitutive parameters.
Highlights
Academic Editors: Carola EspositoCorcione and Alexey V
When the charge is heated to a certain temperature, the low-meltingpoint materials stuffed in the pressure relief holes will be softened and discharged to release the high-temperature and high-pressure gas generated by the decomposing charge and reduce the temperature and pressure within the projectile body; this can lower the reaction level of the ammunition, minimize accident-caused property loss, and ensure the staff safety [2,3,4]
Chen et al [5] compared the reaction characteristics of four lowmelting-point materials—polyethylene (PE), polybutylene terephthalate, polyamide 6, and polycarbonate—under the action of temperature, pressure, and temperature–pressure coupling in a self-made device
Summary
Academic Editors: Carola EspositoCorcione and Alexey V. To improve the insensitivity of ammunition during design, multiple small pressure relief holes, in which low-melting-point materials are stuffed, are usually designed at the bottom or top of the projectile body [1]. When the charge is heated to a certain temperature, the low-meltingpoint materials stuffed in the pressure relief holes will be softened and discharged to release the high-temperature and high-pressure gas generated by the decomposing charge and reduce the temperature and pressure within the projectile body; this can lower the reaction level of the ammunition, minimize accident-caused property loss, and ensure the staff safety [2,3,4]. Chen et al [5] compared the reaction characteristics of four lowmelting-point materials—polyethylene (PE), polybutylene terephthalate, polyamide 6, and polycarbonate—under the action of temperature, pressure, and temperature–pressure coupling in a self-made device. The results showed that PE could more create exhaust ducts at the charge reaction temperature than the other three materials
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