TC4钛合金L型材高温弯曲蠕变的数值模拟研究

Numerical Simulation of High Temperature Bending Creep of TC4 Titanium Alloy L Profile

利用ABAQUS有限元软件,针对TC4钛合金L型材,分别在蠕变温度为500、600和700℃及蠕变时间为600、1200、1800s的条件下,进行高温压弯蠕变的数值模拟分析,研究温度和时间对该L型材高温压弯蠕变变形后回弹量的影响规律。数值模拟结果表明,TC4钛合金应力松弛效果受温度影响明显,当温度为700℃时,应力松弛后残余应力降低至50 MPa以下;蠕变时间为600 s时,应力松弛后残余应力已经降低到趋于稳定的极限值,继续增加蠕变时间,应力松弛效应不发生显著变化。

Based on ABAQUS finite element software, in view of TC4 titanium alloy L profile, under the conditions of creep temperatures of 500,600 and 700 ℃, and creep time of 600, 1200, 1800 s, the numerical simulation analysis of high temperature bending creep was carried out to study the influences of temperature and time on the springback after high temperature bending creep deformation of the L profile. The numerical simulation results show that the stress relaxation effect of TC4 titanium alloy is significantly affected by temperature. When the temperature is 700 ℃, the residual stress after stress relaxation reduces to below 50 MPa;when the creep time is 600 s, the residual stress after stress relaxation has reduced to a stable limit value. With increasing the creep time continuously, the stress relaxation effect does not change significantly.