LC9铝合金的动态力学性能及温度相关性研究  

Research on Mechanical Properties and Their Temperature Dependencies of LC9 Alloys under Dynamic Load

作　　者：苗应刚[1] 邓琼[1] 索涛[1] 周战璇[1] 

机构地区：[1]西北工业大学航空学院,陕西西安710072

出　　处：《兵工学报》2009年第S2期90-93,共4页Acta Armamentarii

基　　金：陕西省自然科学基金(SJ08A07)

摘　　要：利用Hopkinson压杆、拉杆实验装置和万能材料实验机,对LC9铝合金材料在应变率从0.001 s-1至13 000 s-1,温度从77 K至573 K条件下的静动态压缩和拉伸力学性能进行了测试,得到了应力应变关系。结果表明,LC9铝合金应变率不敏感,但具有较强的温度敏感性。对塑性流动行为进行了分析,并修正了Johnson-Cook模型,得出了相应的塑性流动模型参数,拟合结果与试验结果吻合较好,能够描述并预测LC9铝合金材料在不同温度不同应变率耦合作用下的力学行为。The compression and tension tests of LC9 aluminum alloy were carried out at the temperature from 77 K to 573 K using SHPB,SHTB and CCSS88010 universal testing machine with the strain rate from 0.001 1 s-1 to 13 000 s-1.The stress-strain relationship was obtained.The research on its mechanical properties shows that the flow stress is not sensitive to the strain rate at room temperature;but sensitive to temperature.Finally,all the parameters of the model based on Johnson-Cook model were determined by curve-fitting.The prediction results based on the corresponding model agree fairly with the experimental data.

关 键 词：LC9铝合金 流动应力 应变率 本构模型 

分 类 号：TG146.21[一般工业技术—材料科学与工程]