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Ti40阻燃钛合金热变形困难且容易发生开裂。因此,研究该合金在不失效的情况下实现预期的变形就显得非常重要。本研究采用韧性断裂准则和有限元模拟相结合的方法,对Ti40合金热变形过程进行开裂预测。通过圆柱试样不同温度和应变速率的压缩模拟试验,发现在一定的变形条件下该合金会发生纵向开裂和剪切开裂。随后的有限元模拟获得了变形试样各个区间的应力-应变分布情况及演变过程,这被用来评价6种已有的韧性断裂准则对Ti40合金高温变形的初始开裂位置及损伤值预测的准确性。研究结果表明,只有Oyane韧性断裂准则能准确地预测试验范围内所有条件的Ti40合金的初始开裂位置和临界开裂值。
Ti40 flame retardant titanium alloy is difficult to heat deformation and prone to cracking. Therefore, to study the alloy without failure to achieve the expected deformation is very important. In this study, the method of combining the ductile fracture criterion with the finite element method was used to predict the cracking of the Ti40 alloy during thermal deformation. Through compressive simulation tests of different temperatures and strain rates of cylindrical specimens, it is found that the alloy will undergo longitudinal cracking and shear cracking under certain deformation conditions. Subsequent finite element simulation of stress-strain distributions and evolutions in various sections of the deformed specimen were used to evaluate the accuracy of the initial crack locations and damage predicted by the six existing ductile fracture criteria for high-temperature deformation of the Ti40 alloy Sex. The results show that only the Oyane ductile fracture criterion can accurately predict the initial cracking position and the critical cracking value of Ti40 alloy under all conditions within the experimental range.