本文選題：扭轉(zhuǎn)載荷　切入點(diǎn)：鎳基合金涂層　出處：《表面技術(shù)》2017年01期

【摘要】：目的通過有限元仿真獲得熔接涂層與基體結(jié)合界面處的應(yīng)力分布特性,得到熔接涂層與基體的力學(xué)性能匹配性。方法應(yīng)用ABAQUS有限元軟件,將模型沿軸向和徑向剖切,討論不同扭矩載荷下鎳基合金涂層和基體軸結(jié)合界面的應(yīng)力分布規(guī)律,分析涂層厚度對結(jié)合界面處應(yīng)力的影響。結(jié)果從模型剖切后采樣結(jié)點(diǎn)的應(yīng)力變化曲線看,基體和涂層的內(nèi)部應(yīng)力變化均勻,在基體和涂層結(jié)合處應(yīng)力存在突變,涂層上的應(yīng)力大于基體上的應(yīng)力。涂層厚度從0.5 mm增大到1.0 mm時最大應(yīng)力減小量約為18 MPa,從1.0 mm增大到2.5 mm時最大應(yīng)力的減小量約為1 MPa,涂層厚度大于1.0 mm后最大應(yīng)力減小量變化不明顯。結(jié)合面兩側(cè)涂層和基體應(yīng)力差值的最大值Δσ_(max)隨著涂層厚度的增大有所減小,在涂層厚度小于1.0 mm時,變化較為明顯。結(jié)合面底面處的應(yīng)力突變隨涂層厚度的增加而略有減小。結(jié)論在涂層和基體結(jié)合界面處存在應(yīng)力突變,最大應(yīng)力出現(xiàn)在涂層外表面的中心位置,增大涂層厚度可以減小應(yīng)力突變,在涂層厚度較小時效果明顯。
[Abstract]:Aim to obtain the stress distribution at the interface between the weld coating and the substrate by finite element simulation, and to obtain the mechanical properties matching between the weld coating and the substrate.Methods ABAQUS finite element software was used to cut the model along axial and radial direction to discuss the stress distribution of the interface between Ni-base alloy coating and substrate under different torque loads, and to analyze the influence of coating thickness on the stress at the interface.Results from the stress curve of the sampling node after the model cutting, the internal stress of the substrate and the coating changed uniformly, and there was a sudden change in the stress at the joint of the substrate and the coating, and the stress on the coating was larger than that on the substrate.When the coating thickness increases from 0.5 mm to 1.0 mm, the maximum stress decrease is about 18 MPA, and the maximum stress decrease from 1.0 mm to 2.5 mm is about 1 MPA. The maximum stress decrease is not obvious when the coating thickness is greater than 1.0 mm.The maximum value of stress difference between coating and substrate on both sides of the bonding surface 螖 蟽 _ max) decreases with the increase of coating thickness, and the change is more obvious when the coating thickness is less than 1.0 mm.The stress abrupt change at the bottom of the bonding surface decreases slightly with the increase of coating thickness.Conclusion there is a stress mutation at the interface between the coating and the substrate, and the maximum stress appears at the center of the outer surface of the coating. Increasing the thickness of the coating can reduce the stress mutation, and the effect is obvious when the coating thickness is small.
【作者單位】： 沈陽理工大學(xué);
【基金】：遼寧省特聘教授資助項(xiàng)目~~
【分類號】：TG174.4

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