【摘 要】
：
使用电子万能试验机和分离式Hopkinson压杆分别测量TC2钛合金的准静态和动态应变下的应力-应变曲线,并结合显微组织的变化研究了高应变率下的动态流动应力特征.结果 表明:应
【机 构】
：
南京航空航天大学直升机传动技术重点实验室 南京210016
论文部分内容阅读
使用电子万能试验机和分离式Hopkinson压杆分别测量TC2钛合金的准静态和动态应变下的应力-应变曲线,并结合显微组织的变化研究了高应变率下的动态流动应力特征.结果 表明:应变率为1100-6000 s-1时TC2钛合金具有一定的应变率敏感性,随着应变率的提高显示出明显的应变率增强和增塑效应,但是应变率超过4800 s-1后二者均减弱;在应变率为2500 s-1的试样中观察到与加载方向约成45°角的绝热剪切线,随着应变率的进一步提高出现剪切带,但是由于弥散的β颗粒相滑移聚集形成了阻拦带而没有明显增宽.用绝热温升项修正了Johnson-Cook本构模型,进行非线性拟合构建了TC2钛合金在室温下的动态塑性本构关系,统计分析了预测数据和实验数据,2.18％的平均相对误差和0.9935的相关系数说明改进的模型较好地描述了TC2钛合金在室温高应变速率条件下的流变行为.
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