Interfacial behavior of thin film bonded to plastically graded substrate under tensile loading
Interfacial behavior of thin film bonded to plastically graded substrate under tensile loading
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DOI：
10.1016/j.euromechsol.2022.104818
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发表时间：
2022-10
期刊：
影响因子：
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通讯作者：
W. Guo;Peijian Chen;Hao Liu;Guangjian Peng;Jiaming Zhu;Yufei Wu
中科院分区：
文献类型：
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作者：
W. Guo;Peijian Chen;Hao Liu;Guangjian Peng;Jiaming Zhu;Yufei Wu
深入了解薄膜/衬底体系的界面行为，无论在自然界还是在工程实践中都具有重要意义。然而，缺乏对粘结在塑性梯度衬底上的薄膜的界面分析，阻碍了其在柔性电子、生物化学、汽车、航空航天等行业中的各种应用。本文建立了薄膜与有限厚度塑性梯度衬底在拉伸载荷作用下的粘结模型。通过数值模拟和量纲分析，综合研究了塑性性能、梯度层厚度和连接方式对界面应力、塑性变形和塑性能的影响。研究发现，较高的梯度层上、下表面屈服强度比改善了塑性梯度层在上、下均匀衬底之间的载荷传递。粘结层的引入会削弱或抑制塑性梯度性能的影响。本文的研究结果将有助于塑性梯度材料的应用，提高界面力学的知识水平。
A well understanding of interfacial behavior of film/substrate system is of significant importance in both nature and engineering practice. However, the lack of interfacial analyses of thin films bonded to plastically graded substrates hinders various applications in flexible electronics, biochemistry, automobiles, aerospace and other industries. In the present paper, a bonded model between a thin film and a finite-thickness plastically graded substrate under tensile loading is established. By means of numerical simulation and dimension analysis, the influences of the plastic property, the thickness of the graded layer and the connection type on interfacial stress, plastic deformation and plastic energy are comprehensively investigated. It is found that a higher yield strength ratio of upper surface to lower surface of graded layer improves the loading transmission of the plastically graded layer between the upper film and the underlying homogeneous substrate. The effect of plastically graded properties will be weakened or suppressed when bonding layers are introduced. The present findings should be helpful for the applications of plastically graded materials, and improve the knowledge of interface mechanics.