Ti-6Al-4V基体上等离子喷涂羟基磷灰石涂层的热-力耦合（英文）
发布时间：2018-07-28 14:03
【摘要】：在考虑了温度与变形之间的相互作用后,对经典的Fourier瞬态热传导方程进行了修正,并采用适合于高温及高应变率条件下的热弹塑性方程作为本构模型,从而建立了在Ti-6Al-4V基体上等离子喷涂羟基磷灰石涂层这一独特条件下的热-力耦合模型。据此,采用有限元方法对温度场和残余应力场进行了耦合求解。模拟了基体预热温度对涂层各个残余应力分量的影响。此外,为了能得到定量的比较,还采用了"材料去除"的实验技术测试了涂层在界面处的残余应力。结果表明:计算结果与实验结果吻合;在界面的边缘处有明显的应力集中;适当提高基体的预热温度对于减少残余应力是有帮助的。
[Abstract]:After considering the interaction between temperature and deformation, the classical Fourier transient heat conduction equation is modified, and the thermoelastic-plastic equation suitable for high temperature and high strain rate is used as the constitutive model. The thermal-mechanical coupling model of plasma sprayed hydroxyapatite coating on Ti-6Al-4V substrate was established. Based on this, the temperature field and residual stress field are solved by finite element method. The effect of substrate preheating temperature on the residual stress components of the coating was simulated. In addition, in order to obtain quantitative comparison, the residual stress at the interface of the coating was measured by "material removal" technique. The results show that the calculated results are in agreement with the experimental results, the stress concentration is obvious at the edge of the interface, and it is helpful to reduce the residual stress by increasing the preheating temperature of the matrix appropriately.
【作者单位】： 西南交通大学;
【基金】：Applied Basic Research Project in Sichuan Province(2014JY0016)
【分类号】：TG174.4
[Abstract]:After considering the interaction between temperature and deformation, the classical Fourier transient heat conduction equation is modified, and the thermoelastic-plastic equation suitable for high temperature and high strain rate is used as the constitutive model. The thermal-mechanical coupling model of plasma sprayed hydroxyapatite coating on Ti-6Al-4V substrate was established. Based on this, the temperature field and residual stress field are solved by finite element method. The effect of substrate preheating temperature on the residual stress components of the coating was simulated. In addition, in order to obtain quantitative comparison, the residual stress at the interface of the coating was measured by "material removal" technique. The results show that the calculated results are in agreement with the experimental results, the stress concentration is obvious at the edge of the interface, and it is helpful to reduce the residual stress by increasing the preheating temperature of the matrix appropriately.
【作者单位】： 西南交通大学;
【基金】：Applied Basic Research Project in Sichuan Province(2014JY0016)
【分类号】：TG174.4
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