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Revised notched coating adhesion test to account for plasticity and 3D behaviour
Polymer Testing ( IF 5.1 ) Pub Date : 2021-08-28 , DOI: 10.1016/j.polymertesting.2021.107319
Olli Orell 1 , Jarno Jokinen 1 , Marke Kallio 2 , Mikko Kanerva 1
Affiliation  

Specialized polyamide-imide coating on a CuSn10Pb10 substrate, a material combination utilized often in modern bearing applications, is fabricated using the solvent casting method. The coating adhesion is studied using the well-known notched coating adhesion (NCA) test. Conventionally, the critical strain required to cause the debond propagation is determined by visual observation and indirectly linked to measured strain data to calculate fracture toughness. Here, digital image correlation (DIC) is used to systemically study the coating deformations during testing that enables quantitative determination of the instantaneous debond length. With the introduced method, the critical strain to induce the debond of the coating and the propagation of the debond can be determined for non-elastically behaving specimens reliably. The coating’s debond onset is studied with virtual crack closure technique (VCCT) here. The method can take 3D effects into account in detail and provides a sophisticated method to determine the critical energy release rate. Additionally, cohesive zone modelling (CZM) is used to simulate debond progression. Nonlinear stress–strain responses are observed taking place both with the coating and the substrate materials. The results emphasize that the coating plasticity has a remarkable role in the test behaviour which needs to be taken into account in the revised analysis.



中文翻译:

修订了缺口涂层附着力测试以考虑可塑性和 3D 行为

CuSn10Pb10 基材上的特殊聚酰胺-酰亚胺涂层是现代轴承应用中经常使用的材料组合,使用溶剂浇铸方法制造。使用众所周知的缺口涂层附着力 (NCA) 测试研究涂层附着力。通常,引起脱粘传播所需的临界应变是通过目视观察确定的,并与测量的应变数据间接相关,以计算断裂韧性。在这里,数字图像相关 (DIC) 用于系统地研究测试过程中的涂层变形,从而能够定量确定瞬时脱粘长度。通过引入的方法,可以可靠地确定非弹性行为试样引起涂层脱粘和脱粘传播的临界应变。此处使用虚拟裂纹闭合技术 (VCCT) 研究涂层的脱粘开始。该方法可以详细考虑 3D 效应,并提供一种复杂的方法来确定临界能量释放率。此外,内聚区建模 (CZM) 用于模拟脱粘过程。观察到非线性应力应变响应发生在涂层和基底材料上。结果强调,涂层塑性在测试行为中具有显着作用,需要在修订分析中加以考虑。观察到非线性应力应变响应发生在涂层和基底材料上。结果强调,涂层塑性在测试行为中具有显着作用,需要在修订分析中加以考虑。观察到非线性应力应变响应发生在涂层和基底材料上。结果强调,涂层塑性在测试行为中具有显着作用,需要在修订分析中加以考虑。

更新日期:2021-09-06
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