【摘要】：在考慮了溫度與變形之間的相互作用后,對經(jīng)典的Fourier瞬態(tài)熱傳導方程進行了修正,并采用適合于高溫及高應變率條件下的熱彈塑性方程作為本構(gòu)模型,從而建立了在Ti-6Al-4V基體上等離子噴涂羥基磷灰石涂層這一獨特條件下的熱-力耦合模型。據(jù)此,采用有限元方法對溫度場和殘余應力場進行了耦合求解。模擬了基體預熱溫度對涂層各個殘余應力分量的影響。此外,為了能得到定量的比較,還采用了"材料去除"的實驗技術(shù)測試了涂層在界面處的殘余應力。結(jié)果表明:計算結(jié)果與實驗結(jié)果吻合;在界面的邊緣處有明顯的應力集中;適當提高基體的預熱溫度對于減少殘余應力是有幫助的。
[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.
【作者單位】： 西南交通大學;
【基金】：Applied Basic Research Project in Sichuan Province(2014JY0016)
【分類號】：TG174.4

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