Enhanced and weakened strength in brittle film-substrate structure
Enhanced and weakened strength in brittle film-substrate structure
复制标题
脆性薄膜-基材结构强度的增强和减弱
DOI：
10.1016/j.matdes.2016.06.111
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发表时间：
2016-10
影响因子：
8.4
通讯作者：
Zhao Xiang
中科院分区：
文献类型：
--
作者：
Lu Yongjun;Zhang Kai;Wang Fenghui;Lou Kang;Zhao Xiang
多用途多层膜的力学性能，包括表观拉伸强度，对于评估多层膜的可靠性是重要的。然而，在双轴弯曲，存在增强或减弱的性能时，测量层合板的表观强度，类似于那些发现在单轴拉伸载荷。在本文中，提出了一个模型来预测薄膜的表观强度施加拉伸载荷的影响。通过引入表观强度增强因子（ASEF），讨论了6种表征复合膜性能增强或减弱的情况。值得注意的是，ASEF是独立的热残余应力的情况下，衬底可以继续维持整个外部负载时，薄膜裂纹首先。实验结果清楚地表明，叠层半电池的断裂应力低于相应的阳极基板。所提出的模型的预测能力已被实验结果验证，但仍需要额外的实验，以严格评估模型的预测范围内的双层层压板。此外，通过对不同加载方式下多层复合材料力学性能的对比分析，表明本文的分析方法对多层复合材料力学完整性的设计和探讨具有一定的指导意义。
The mechanical properties of multi-use multilayers including the apparent tensile strength are important for estimating the multilayer's reliability. Yet in biaxial flexure, there exist enhanced or weakened performances when measuring apparent strength of laminates, resembling those found in uniaxial tensile load. In this paper, a model is proposed to predict the effect of thin film on apparent strength in terms of the applied tensile load. Six cases are discussed to characterize the enhanced or weakened performances of laminated membranes by introducing Apparent Strength Enhancement Factor (ASEF). It is notable that the ASEF is independent from thermal residual stresses in the case where substrate can continue to sustain the entire external load solely when film cracks first. Experimental results show clearly that fracture stress of laminated half-cell is lower than that of corresponding anode substrate. The prediction capability of the proposed model has been validated by the experimental results, though additional experiments are still required in order to critically assess the model's predictions over a range of bilayer laminates. In addition, comparison of the reverse mechanical performances between different types of loading reveals that the present analysis is significative for design and discussion of the mechanical integrity for multi-use multilayers.
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影响因子：
56.9
作者：
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通讯作者：
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影响因子：
2.1
作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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