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Determination of interfacial fracture toughness of coatings using circumferentially notched cylindrical substrate

机译：使用周向缺口圆柱基材测定涂层的界面断裂韧性

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摘要

The evaluation of interfacial strength is a challenging task due to the complexity of loading, the thickness of coating and the material conditions of interface cracking and coating spallation. In this study, a new method using circumferentially notched tensile (CNT) specimens is proposed for evaluating the interfacial fracture toughness of coated materials. The 0°, 15°, 30° and 45° notch angled mild steel cylindrical substrates with electroplated nickel were tensile tested. A well defined precrack was introduced at the interface for quantitative evaluation of adhesion. In situ acoustic signals were acquired to obtain the crack initiation or the critical load. The crack initiation and propagation were analysed using scanning electron microscope. Finite element analyses were used to evaluate the critical interface energy release rate as a function of mode mixity from the obtained critical load. The results showed an increase in the interfacial fracture toughness values with an increase in the phase angle. Based on the findings, it has been concluded that this proposed method is an easier testing method to evaluate the adhesive properties of coatings on metallic substrates compared to traditional methods.
机译：由于加载的复杂性，涂层的厚度以及界面开裂和涂层剥落的材料条件，界面强度的评估是一项艰巨的任务。在这项研究中，提出了一种使用周向切口拉伸（CNT）试样的新方法来评估涂层材料的界面断裂韧性。对带有电镀镍的0°，15°，30°和45°切口角的低碳钢圆柱形基材进行了拉伸测试。在界面处引入了定义明确的预裂纹，以定量评估粘合力。采集现场声信号以获得裂纹萌生或临界载荷。使用扫描电子显微镜分析裂纹的萌生和扩展。有限元分析被用来评估临界界面能量释放速率，该能量释放速率是所获得临界载荷的模态混合的函数。结果表明，随着相角的增加，界面断裂韧性值增加。基于这些发现，可以得出结论，与传统方法相比，该方法是一种更简便的测试方法，可以评估金属基材上涂层的粘合性能。

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