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首页> 外文期刊>Surface & Coatings Technology >Numerical study of tensile tests conducted on systems with elastic-plastic films deposited onto elastic-plastic substrates
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Numerical study of tensile tests conducted on systems with elastic-plastic films deposited onto elastic-plastic substrates

机译：在具有弹塑性薄膜的系统上进行拉伸试验的数值研究

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In this work, a series of two-dimensional plane-strain finite element analyses was conducted to further understand the stress distribution during tensile tests on coated systems. Besides the film and the substrate, the finite element model also considered a number of cracks perpendicular to the film/substrate interface. Different from analyses commonly found in the literature, the mechanical behavior of both film and substrate was considered elastic-perfectly plastic in part of the analyses. Together with the film yield stress and the number of film cracks, other variables that were considered were crack tip geometry, the distance between two consecutive cracks and the presence of an interlayer. The analysis was based on the normal stresses parallel to the loading axis (σ_(xx)), which are responsible for cohesive failures that are observed in the film during this type of test. Results indicated that some configurations studied in this work have significantly reduced the value of σ_(xx) at the film/substrate interface and close to the pre-defined crack tips. Furthermore, in all the cases studied the values of σ_(xx) were systematically larger at the film/substrate interface than at the film surface.
机译：在这项工作中，进行了一系列二维平面应变有限元分析，以进一步了解涂层系统的拉伸测试过程中的应力分布。除了薄膜和基底，有限元模型还考虑了许多垂直于薄膜/基底界面的裂纹。与文献中常见的分析方法不同，在部分分析中，薄膜和基材的机械性能均被认为是完全弹性的塑性。连同膜的屈服应力和膜的裂纹数量，其他考虑的变量包括裂纹尖端的几何形状，两个连续裂纹之间的距离以及中间层的存在。分析是基于平行于加载轴（σ_（xx））的法向应力进行的，该法向应力是在这种类型的测试期间在膜中观察到的内聚破坏的原因。结果表明，在这项工作中研究的某些构型已大大降低了膜/基底界面处的σ_（xx）值，并接近了预定的裂纹尖端。此外，在所研究的所有情况下，膜/基底界面处的σ_（xx）值在系统上都大于膜表面。

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