【摘要】 为研究Fe-36Ni因瓦合金的动态力学性能及其本构关系,在20～800℃和10-3～104 s-1的应变率内,采用电子万能试验机和高温分离式霍普金森压杆分别对Fe-36Ni因瓦合金进行准静态实验和动态压缩实验,得到其高温、高应变率下的应力-应变曲线.结果表明,Fe-36Ni因瓦合金的流动应力表现出较强的应变率和温度敏感性,随着应变率的增大而增大,随着温度的升高而减小.采用改进应变率项和温度项的Johnson-Cook本构方程拟合了Fe-36Ni因瓦合金在高温、高应变率下的动态塑性本构关系,拟合结果与试验数据吻合很好.更多还原

【Abstract】 To study the dynamic mechanical property and constitutive relation of Fe-36Ni invar alloy,quasi-static and dynamic compression experiments of Fe-36Ni invar alloy were performed at a range of temperature from 20 ℃ to 800 ℃ and strain rate form 10-3to 104/s by electronic universal testing machine and high temperature Split Hopkinson Pressure Bar,and the curves of stress-strain under high temperatures and high strain rates were gained.The results indicate that the flow stress of Fe-36Ni Invar alloy is sensitive to the strain rate and temperature.The flow stress increases with the increasing of strain rate and the decreasing of temperature.An improved Johnson-Cook model with new strain rate item and temperature item was presented to fit the stress-strain curves of Fe-36Ni invar alloy very well.更多还原