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界面粗糙度對(duì)熱障涂層殘余應(yīng)力和裂紋演化的影響
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國(guó)家自然科學(xué)基金（10802065）；西北工業(yè)大學(xué)基礎(chǔ)研究基金（NPU-FFR-JC201240）


Effects of Interface Roughness on Residual Stress Distribution and Crack Nucleation and Propagation in Thermal Barrier Coatings
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    摘要:

    由于殘余應(yīng)力的作用是造成熱障涂層失效剝落的主要因素之一，本工作采用不同幅值的正弦曲線來(lái)模擬粗糙度對(duì)陶瓷層 (TBC)-結(jié)合層 (BC) 界面處殘余應(yīng)力分布的影響；以內(nèi)聚力模型模擬TBC-BC界面，研究了在外加機(jī)械載荷作用下粗糙度對(duì)界面裂紋萌生和擴(kuò)展的影響。結(jié)果表明，粗糙度對(duì)殘余應(yīng)力分布以及裂紋的形核與擴(kuò)展有很大的影響。隨著粗糙度的增大，陶瓷層和結(jié)合層靠近界面的波峰波谷處最大拉/壓應(yīng)力也增大。當(dāng)施加一定拉伸位移載荷時(shí)，最大損傷與裂紋首先在幅值最小的波峰波谷處產(chǎn)生。

    Abstract:

    The residual stress is one of the main factors to cause the failure of thermal barrier coatings. In this paper, a sinusoid curve with different amplitudes was used to model the roughness of interface between ceramic top coat (TBC) and bond coat (BC) in thermal barrier coatings and the effect of interface roughness on residual stress distribution was analyzed. Besides, the effect of roughness on interfacial crack nucleation and propagation under load was simulated with cohesive zone model. Results show that the interface roughness has a significant effect on residual stress distribution and crack nucleation and propagation. With the increase of interfacial roughness, the maximum tensile/compressive stress near the interface also increases in the TBC/BC. When applying a certain tensile displacement load, the maximum damage and crack firstly take place in the peak and valley of minimum amplitude.

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王力彬,于慶民.界面粗糙度對(duì)熱障涂層殘余應(yīng)力和裂紋演化的影響[J].稀有金屬材料與工程,2014,43(12):3095~3099.[Wang Libin, Yu Qingmin. Effects of Interface Roughness on Residual Stress Distribution and Crack Nucleation and Propagation in Thermal Barrier Coatings[J]. Rare Metal Materials and Engineering,2014,43(12):3095~3099.]
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  • 收稿日期:2013-12-11
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  • 在線發(fā)布日期: 2015-04-16
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