论文标题
高应变速率压缩的环氧微柱
High strain rate compression of epoxy micro pillars
论文作者
论文摘要
到目前为止，由于缺乏合适的仪器，对材料对材料的高应变速率机械行为的研究受到了阻碍。在本研究中，引入了一种新型的高应变速率微柱压缩设置。高速测试是通过基于摆的纳米识别装置的冲击配置进行的，该设备通过压电负载电池仪器具有强力感应能力。这是由于相当大的惯性效应，这使得对样品上的实际施加力远高于驱动的惯性作用。提出的新技术成功地用于研究环氧树脂在广泛的应变速率上的机械行为。结果揭示了明显的应变速率灵敏度，与宏观上相同材料获得的应变速率良好相关，从而验证了新型设置。
The study of the high strain rate mechanical behaviour of materials using micropillar compression tests has been hindered so far due to the lack of suitable instrumentation. In the present study, a novel high strain rate micropillar compression set-up is introduced. The high speed tests are carried out with the impact configuration of a pendulum-based nanoindentation device that was instrumented with force-sensing capability by means of a piezoelectric load cell. This is necessary due to the considerable inertia effects that make the actual applied force on the sample much higher than the actuated one. The proposed novel technique was successfully applied to study the mechanical behaviour of an epoxy resin over a wide range of strain rates. The results reveal a significant strain rate sensitivity that correlates well with that obtained for the same material at the macroscale, validating the novel set-up.
