聚碳酸酯高应变率分离式霍普金森压杆实验研究  

Experimental Investigation of Polycarbonate at High Strain Rate by SHPB

作　　者：孙朝翔[1] 鞠玉涛[1] 胡少青[1] 郑亚[1] 

机构地区：[1]南京理工大学机械工程学院,江苏南京210094

出　　处：《南京理工大学学报》2012年第3期529-533,共5页Journal of Nanjing University of Science and Technology

摘　　要：为获得聚碳酸酯(PC)在环境温度范围内的动态力学特性,该文利用分离式霍普金森压杆技术对PC进行高应变率动态压缩力学实验。在低温-50℃、常温+15℃和高温+50℃三种温度下进行实验,并对实验数据有效性进行检验。用二波法对数据进行处理,得到PC在不同应变率下的应力应变曲线。基于应力应变曲线分析了应变率和温度对PC动态压缩特性的影响。实验结果表明PC具有明显的应变率相关性。在高应变率下,PC的屈服强度约为静态下的1.6倍。在动态下,屈服应力随着应变率的增加不断增加,与应变率常用对数呈线性增长关系。PC也具有对温度的敏感性,其屈服应力随着温度的升高而降低,表现为温度软化效应。在-50～+50℃范围内,PC力学特性基本一致,屈服应力变化幅值不超过6%。In order to obtain the dynamic mechanical properties of polycarbonate （ PC ） material in ambient temperatures ,high strain rate dynamic compressive mechanics experiments of PC are done using split Hopkinson pressure bar （SHPB）technique at three different ambient temperatures： -50 ℃ ,＋15 ℃ and ＋50 ℃. The availability of the data is examined. The data are dealt with one- wave method, and the stress-strain curves of PC in different strain rates are obtained. The effects of strain rates and temperatures on dynamic compression behaviors of PC are analyzed based on the stress-strain curves. The result suggests that PC is a significant strain rate dependent material. The yield strength of PC increases at high strain rates, which is approximately 1.6 times higher than that under quasi-static. The yield stress increases with the strain rate, showing a linear growth relationship with the logarithm of the strain rate. PC is sensitive to temperature. The yield stress decreases with the increase of temperature showing temperature softening effect. When temperature ranges in -50 ＋50 ℃, the mechanic performances of PC almost remain the same, and the change range of the yield stress is not more than 6%.

关 键 词：聚碳酸酯 高应变率 分离式霍普金森压杆 二波法 屈服强度 温度软化 

分 类 号：O347.3[理学—固体力学]