摘要
利用有限元技术,研究了氢含量对TC4钛合金切削力及切削温度的影响规律,并对高速切削时的切削力、切削温度的规律进行了预测。利用电子万能材料试验机及霍普金森压杆装置获取了不同应变速率及温度时置氢钛合金的流变行为,通过数据的拟合得到了Johnson-Cook(J-C)本构方程,据此建立了切削数值模型。切削力及切削温度的模拟结果与试验数据对比表明,所建立的有限元模型能够较准确地反映切削过程。切削力及切削温度均随着氢含量的增加而呈现先减小后增加的相似规律,氢含量为0.3%时其所对应的切削力及切削温度均最低;高速切削下氢含量对切削力及切削温度的影响较低速时弱。
The present study is undertaken to investigate the effect of hydrogen on the cutting force and cutting temperature of Ti - 6A1 - 4V alloy by FEM, and the tendency at higher cutting speed is predicted. Mechanical behaviors of hydrogenated Ti - 6A1 -4V alloy are studied at elevated temperatures and high strain rates with split Hopkinson pressure bar （SHPB）. The Johnson-Cook model is developed combined with quasi-static experimental data. A numerical model is developed to simulate the cutting process. The results of the experiments and simulations correlate well. The results demonstrate that the presence of hydrogen has a significant effect on the cutting forces and temperature, and the cutting forces and temperature increase first and then decreased gradually with the increasing of hydrogen contents. The simulation results show that titanium alloys with 0.3 % hydrogen has better machinability. In addltion, the effect of hydrogen on cutting force and cutting temperature at high cutting speed is weaker than at low speed.
出处
《工具技术》
2011年第6期27-30,共4页
Tool Engineering
基金
国家自然科学基金资助项目(50775115)
关键词
置氢钛合金
本构方程
有限元
切削
hydrogenated titanium alloy
constitutive equation
FEM
cutting
