Finite Element Simulation of Stress Distribution in Plasma Sprayed Thermal Barrier Coating
摘 要
采用热弹性有限元方法研究了热载荷条件下由数值模拟方法生成的热障涂层冷却至室温后的应力分布, 分析了热生长氧化物(TGO)层及其厚度对热障涂层应力分布的影响, 并与文献的试验结果进行了对比。结果表明: 不含TGO层的热障涂层, 陶瓷层和粘结层的凸起处为拉应力, 凹陷处为压应力; TGO层形成后, 陶瓷层凸起处表现为压应力, 凹陷处表现为拉应力; 界面附近的陶瓷层在TGO层达到一定厚度时出现应力反转现象, 且该现象的出现随着界面粗糙度的增大而延迟; 模拟预测的应力与文献报道的结果相近, 证明了模拟结果的正确性。
Abstract
A simulated micrograph of thermal barrier coating (TBC) was chosen to study the stress distribution at the thermal loading, cooling from initial temperature to room temperature, by using the thermoelasticity finite element method. The influence of thermally grown oxide (TGO) and its thickness on the stress distribution in TBC were analyzed. The simulated result was compared with the experimental result reported in literature. The results show that tensile stress was present at the peak and compressive stress was present at the valleys in as-sprayed conditions (that is, without TGO). When growing TGO layer, tensile stress appeard at the valley and compressive stresses appeared at the peak. The stress inversion appeared in the topcoat after reaching a certain TGO thickness, and the stress inversion was delayed by the increase of interface roughness. The predicted values of stress agreed well with the experimental result reported in the literatures, which confirms the validity of the simulation.
中图分类号 TG174.444 DOI 10.11973/jxgccl201509020
所属栏目 物理模拟与数值模拟
基金项目
收稿日期 2014/3/18
修改稿日期 2015/4/3
网络出版日期
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备注郑允宅(1988-), 男, 福建三明人, 硕士研究生。
引用该论文: ZHENG Yun-zhai,ZHU Jian-feng,CAO Ping-li,LI Qiang. Finite Element Simulation of Stress Distribution in Plasma Sprayed Thermal Barrier Coating[J]. Materials for mechancial engineering, 2015, 39(9): 84~88
郑允宅,朱建峰,曹萍丽,李强. 等离子喷涂热障涂层中应力分布的有限元模拟[J]. 机械工程材料, 2015, 39(9): 84~88
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参考文献
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【2】韩萌, 黄继华, 陈树海. 热障涂层应力与失效机理若干关键问题的研究进展与评述[J]. 航空材料学报, 2013,33(5):83-98.
【3】张红松,王富耻,马壮, 等. 等离子喷涂ZrO2热障涂层的热冲击性能[J].机械工程材料,2007,31(1):86-88.
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【5】GUPTA M, SKOGSBERG K, NYLN P. Influence of topcoat-bondcoat interface roughness on stresses and lifetime in thermal barrier coatings[J].Journal of Thermal Spray Technology,2014,23:170-181.
【6】AHRENS M, VAEN R, STVER D. Stress distributions in plasma-sprayed thermal barrier coatings as a function of interface roughness and oxide scale thickness [J]. Surface and Coatings Technology,2002,161:26-35.
【7】RANJBAR-FAR M, ABSI J, MARIAUX G, et al. Simulation of the effect of material properties and interface roughness on the stress distribution in thermal barrier coatings using finite element method [J].Materials & Design,2010,31:772-781.
【8】RANJBAR-FAR M, ABSI J, MARIAUX G, et al. Crack propagation modeling on the interfaces of thermal barrier coating system with different thickness of the oxide layer and different interface morphologies[J]. Materials & Design,2011,32:4961-4969.
【9】WEI S, FU-CHI W, QUN-BO F, et al. Lifetime prediction of plasma-sprayed thermal barrier coating systems[J]. Surface and Coatings Technology,2013,217: 39-45.
【10】GHAFOURI-AZAR R, MOSTAGHIMI J, CHANDRA S. Modeling development of residual stresses in thermal spray coatings [J]. Computational Materials Science,2006,35:13-26.
【11】KLUSEMANN B, DENZER R, SVENDSEN B. Microstructure-based modeling of residual stresses in WC-12Co-sprayed coatings [J]. Journal of Thermal Spray Technology,2012,21:96-107.
【12】LIMARGA A M, VAEN R, CLARKE D R. Stress distributions in plasma-sprayed thermal barrier coatings under thermal cycling in a temperature gradient [J]. Journal of Applied Mechanics,2011,78:1-9.
【2】韩萌, 黄继华, 陈树海. 热障涂层应力与失效机理若干关键问题的研究进展与评述[J]. 航空材料学报, 2013,33(5):83-98.
【3】张红松,王富耻,马壮, 等. 等离子喷涂ZrO2热障涂层的热冲击性能[J].机械工程材料,2007,31(1):86-88.
【4】EVANS H. Oxidation failure of TBC systems: an assessment of mechanisms [J]. Surface and Coatings Technology,2011,206:1512-1521.
【5】GUPTA M, SKOGSBERG K, NYLN P. Influence of topcoat-bondcoat interface roughness on stresses and lifetime in thermal barrier coatings[J].Journal of Thermal Spray Technology,2014,23:170-181.
【6】AHRENS M, VAEN R, STVER D. Stress distributions in plasma-sprayed thermal barrier coatings as a function of interface roughness and oxide scale thickness [J]. Surface and Coatings Technology,2002,161:26-35.
【7】RANJBAR-FAR M, ABSI J, MARIAUX G, et al. Simulation of the effect of material properties and interface roughness on the stress distribution in thermal barrier coatings using finite element method [J].Materials & Design,2010,31:772-781.
【8】RANJBAR-FAR M, ABSI J, MARIAUX G, et al. Crack propagation modeling on the interfaces of thermal barrier coating system with different thickness of the oxide layer and different interface morphologies[J]. Materials & Design,2011,32:4961-4969.
【9】WEI S, FU-CHI W, QUN-BO F, et al. Lifetime prediction of plasma-sprayed thermal barrier coating systems[J]. Surface and Coatings Technology,2013,217: 39-45.
【10】GHAFOURI-AZAR R, MOSTAGHIMI J, CHANDRA S. Modeling development of residual stresses in thermal spray coatings [J]. Computational Materials Science,2006,35:13-26.
【11】KLUSEMANN B, DENZER R, SVENDSEN B. Microstructure-based modeling of residual stresses in WC-12Co-sprayed coatings [J]. Journal of Thermal Spray Technology,2012,21:96-107.
【12】LIMARGA A M, VAEN R, CLARKE D R. Stress distributions in plasma-sprayed thermal barrier coatings under thermal cycling in a temperature gradient [J]. Journal of Applied Mechanics,2011,78:1-9.
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