采用改进的SHPB方法对闭孔泡沫铝的动态压缩性能的研究
Study on Dynamic Compressive Properties of Closed-cell Foamed Aluminum Using Improved SHPB Method
李志武1, 许金余1,2, 范飞林1, 苏灏扬1
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作者单位：(1. 空军工程大学 工程学院机场建筑工程系, 陕西 西安 710038; 2. 西北工业大学 力学与土木建筑学院, 陕西 西安 710072)
中文关键字：闭孔泡沫铝； 动态压缩性能； 分离式Hopkinson压杆； 应变率效应
英文关键字：closed-cell foamed aluminum; dynamic compressive properties; split Hopkinson pressure bar(SHPB); strain rate effect
中文摘要：采用改进的分离式霍普金森压杆，分别对长度为10、16 mm的闭孔泡沫铝试件在不同应变率下进行了动态压缩试验，得出了相应的应力-应变曲线，分析了应变率对闭孔泡沫铝的变形、应力以及能量吸收性能的影响。结果表明：在340 ～1350 s-1下，两组试件均未能完全压实，动态压缩应力-应变曲线只存在弹性区和屈服平台区，缺少致密区；闭孔泡沫铝的变形、应力以及能量吸收性能均有明显的应变率效应。
英文摘要：The dynamic compressive properties of closed-cell foamed aluminum with the length of 10 mm and 16 mm were studied at different strain rate using improved SHPB apparatus. The corresponding dynamic compressive stress-strain curves were obtained. The effects of strain rate on the transmutation, mechanical property and energy absorption were analyzed. The results show that, under the strain rate of 340 s-1～1350 s-1, the two aluminum samples do not completely compact, the dynamic compressive stress-strain curves could be only divided into elastic region and collapse region, but lack of densification region. The transmutation, mechanical property and energy absorption have a significant effect on the strain rate of the closed-cell foamed aluminum.