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利用加装了自行研制的半导体高低温调控装置的特别加长的分离式Hopkinson杆,对三元乙丙橡胶在变温度(233K～323K)、变应变率(1.8×103/s～3×103/s)条件下进行力学性能实验。为贴近军事装备相关的自然环境要求,分别测定和拟合了三元乙丙橡胶在各个相同温度条件下不同应变率以及各个相同应变率条件下不同温度的应力-应变曲线。结果表明:三元乙丙橡胶的力学性能受温度和应变率影响明显,其刚度随着应变率的增加而增加,其柔性随着温度的增加而增强。温度和应变率对其力学性能的影响有一定的等效性。文中给出了三元乙丙橡胶材料高应变率条件下由橡胶态向玻璃态转变的温度值。
By using a specially designed split Hopkinson bar equipped with self - developed semiconductor high and low temperature control devices, the mechanical properties of EPDM at different temperature (233K ~ 323K), strain rate (1.8 × 103 / s ~ 3 × 103 / s) under the conditions of mechanical properties experiments. In order to be close to the requirements of natural environment related to military equipment, the stress-strain curves of EPDM at different temperatures under the same temperature conditions and at the same strain rates were measured and fitted respectively. The results show that the mechanical properties of EPDM are significantly affected by temperature and strain rate. The stiffness increases with the increase of strain rate, and its flexibility increases with the increase of temperature. The effect of temperature and strain rate on its mechanical properties has some equivalence. In this paper, the temperature of rubber-to-glass transition of EPDM rubber under high strain rate is given.