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Application of analytical methodology in parametric analysis of the stress state in a coating-substrate system based on dental materials
Journal of the Mechanical Behavior of Biomedical Materials ( IF 3.9 ) Pub Date : 2020-12-29 , DOI: 10.1016/j.jmbbm.2020.104297
Nikolay Dolgov , Tsanka Dikova

The aim of the present paper is to use analytical methodology by 2D shear-lag model in parametric analysis of the normal stress in the coating. The tension of a substrate with coatings on its top and bottom surfaces is considered. The parametric study is performed by varying coating thickness and elastic properties both the coating and the substrate. The calculations are done for different groups of dental materials – polyetheretherketone, dental resin composite and porcelain as a coating material and high gold, palladium and Co–Cr alloys as a substrate material.

It is established that the coating thickness strongly influences the normal stresses parallel to the loading axis – its increasing leads to decreasing of normal stresses in the coating. However, the increase of the coating thickness results in negligible increase of the additional normal stresses (perpendicular to the loading axis) in the central part of the coating. Young's modulus of the coating considerably influences the normal stresses parallel to the loading axis, while its influence on the additional normal stresses appears mainly in the zones near the free edge of the coating. The increase of the modulus of elasticity of the coating causes increase of the both normal stresses. The increasing of Young's modulus of the substrate insignificantly influences on the both normal stress in the coating.

It is found that: 1) the lowest normal stresses are generated in the porcelain layer with the largest thickness of 2.0 mm; 2) the porcelain is characterized with the highest normal stresses compared to the polymer and composite coating materials; 3) the alloy type of the substrate has negligible effect on both the normal stress in the porcelain coating.

The results are validated by tensile test of Co–Cr dental alloy specimens coated with porcelain. A good agreement is found between the analytical approach and the failure behaviour of the porcelain coating. Therefore, the proposed analytical model can be used as a tool to study the stress state in the coating under tensile test of coated flat specimens.



中文翻译:

分析方法在基于牙科材料的涂层基体系统应力状态参数分析中的应用

本文的目的是将二维剪切滞后模型的分析方法用于涂层中法向应力的参数分析。考虑了在其顶表面和底表面上具有涂层的衬底的张力。参数研究是通过同时改变涂层和基材的涂层厚度和弹性性能来进行的。计算是针对不同类别的牙科材料进行的-聚醚醚酮,牙科树脂复合材料和瓷作为涂层材料,高金,钯和Co-Cr合金作为基质材料。

可以确定的是,涂层厚度会严重影响平行于加载轴的法向应力-涂层厚度的增加会导致涂层中法向应力的减小。但是,涂层厚度的增加导致涂层中心部分的附加法向应力(垂直于加载轴)的增加可以忽略不计。涂层的杨氏模量极大地影响了平行于加载轴的法向应力,而其对附加法向应力的影响主要出现在涂层自由边缘附近的区域中。涂层弹性模量的增加导致两个法向应力的增加。基材的杨氏模量的增加对涂层中的两个法向应力影响均很小。

发现:1)在最大厚度为2.0 mm的瓷层中产生最低的正应力;2)与聚合物和复合涂层材料相比,瓷器具有最高的正应力;3)基材的合金类型对瓷涂层的法向应力的影响都可以忽略不计。

通过涂有瓷器的Co-Cr牙科合金试样的拉伸试验验证了结果。在分析方法和瓷涂层的失效行为之间找到了很好的协议。因此,所提出的分析模型可以作为研究涂层扁平试样拉伸试验中涂层应力状态的工具。

更新日期:2021-01-04
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