空位缺陷影响Ti_(3)Al涂层阻尼特性的仿真研究

Simulation Study on Influence of Vacancy Defects on Energy Consumption of Ti_(3)Al Coatings

阻尼涂层减振是解决航空发动机叶片断裂问题的有效方法之一。因此,准确模拟无机纳米涂层缺陷区域微观结构,揭示缺陷区域对涂层阻尼特性的影响,对航空发动机运转可靠性具有重大意义。利用分子动力学方法计算得出Ti_(3)Al涂层沿x方向拉伸时模型的应力和应变值,从而得到Ti_(3)Al涂层的应力-应变曲线。通过应力-应变曲线计算出不同缺陷率Ti_(3)Al涂层的韧性模量,对比韧性模量的大小,结果表明:缺陷率为0.3%的Ti_(3)Al涂层阻尼性能最好。对缺陷率为0.3%的Ti_(3)Al涂层微观结构进行模拟和分析,发现在拉伸过程中模型缺陷由空位演变为位错缺陷。

Damping coating damping is one of the most effective methods to solve the aero engine blade fracture problem. Therefore, simulating the microstructure of the inorganic nano-coating accurately and revealing the effect of the defect area on the damping characteristics of the coating, which is of great significance to the operational reliability of the aero-engine. The molecular dynamics method was used to calculate the stress and strain values of the Ti_(3)Al coating when it was stretched in the x-direction.The stress-strain curve of the Ti_(3)Al coating was obtained. The toughness modulus of the Ti_(3)Al coating with different defect rates by stress-strain curve and contrasting the modulus of toughness was calculated. The results show that Ti_(3)Al coating with a defect rate of 0.3% has the best damping performance. The microstructure of the Ti_(3)Al coating with a defect rate of 0.3% was simulated and analyzed. The results show that the model defect evolves from a vacancy to a dislocation defect during stretching process.