R. Huang, Y. Zheng, S. Luo, H. Bai, P. Wang, Y. Chen, Z. Qu
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The impact of substrate effects on indentation-induced fracture behaviors was further studied using finite element analysis (FEA).</p><h3>Results</h3><p>The Palmqvist shape of the indentation crack under low loads was successfully identified. The first pop-in event in the load-displacement (<i>P</i>-<i>h</i>) curve was determined to be triggered by bottom cracking, marking the onset of the multiple fracture mode. Laugier’s equation offered a stable and reliable estimation of fracture toughness for the coating in the radial cracking mode.</p><h3>Conclusions</h3><p>XCT plays a crucial role in selecting the appropriate equation for indentation toughness calculation. The critical indentation depth for the first pop-in was suggested as the threshold for reliably extracting intrinsic fracture toughness of cermet coatings. 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引用次数: 0
摘要
背景金属陶瓷涂层的表面脆性断裂严重限制了其应用。本文旨在提出一种精确表征金属陶瓷涂层断裂韧性的方法。方法通过仪器压痕法和 X 射线计算机断层扫描（XCT），研究了 WC-12%Co 涂层在各种载荷下的压痕诱导断裂行为。XCT 对涂层内的三维次表层裂纹形态和损伤演变进行了非破坏性观察。压痕响应与损伤演变相关。利用有限元分析 (FEA) 进一步研究了基底效应对压痕诱导断裂行为的影响。载荷-位移（P-h）曲线中的第一个弹入事件被确定为由底部开裂引发，标志着多重断裂模式的开始。结论 XCT 在选择适当的压痕韧性计算公式方面起着至关重要的作用。建议将首次弹入的临界压痕深度作为可靠提取金属陶瓷涂层内在断裂韧性的临界值。数值结果表明，临界深度与涂层厚度之间存在恒定的线性关系，临界深度对基体屈服应力的敏感性很高。所提出的分析程序有望推广到金属基底上的各种金属陶瓷涂层。
Characterization on Fracture Toughness of Cermet Coating Coupling Instrumented Indentation and X‑Ray Computed Tomography
Background
The surface brittle fracture of cermet coating seriously restricts its application. Accurate evaluation of the fracture toughness of cermet coating is a prerequisite for improving its life.
Objective
This paper aims to propose an accurate characterization method for fracture toughness of cermet coating.
Methods
By coupling instrumented indentation and X‑ray computed tomography (XCT), the indentation-induced fracture behaviors under various loads within WC-12%Co coatings were studied. The three-dimensional subsurface crack morphologies and the damage evolution within the coating were nondestructively observed by XCT. The indentation response was correlated with the damage evolution. The impact of substrate effects on indentation-induced fracture behaviors was further studied using finite element analysis (FEA).
Results
The Palmqvist shape of the indentation crack under low loads was successfully identified. The first pop-in event in the load-displacement (P-h) curve was determined to be triggered by bottom cracking, marking the onset of the multiple fracture mode. Laugier’s equation offered a stable and reliable estimation of fracture toughness for the coating in the radial cracking mode.
Conclusions
XCT plays a crucial role in selecting the appropriate equation for indentation toughness calculation. The critical indentation depth for the first pop-in was suggested as the threshold for reliably extracting intrinsic fracture toughness of cermet coatings. Numerical results revealed a constant linear relationship between the critical depth and coating thickness, and a high sensitivity of the critical depth to yield stress of the substrate. The proposed analytical procedure holds potential for generalization to diverse cermet coatings on metal substrates.
期刊介绍：
Experimental Mechanics is the official journal of the Society for Experimental Mechanics that publishes papers in all areas of experimentation including its theoretical and computational analysis. The journal covers research in design and implementation of novel or improved experiments to characterize materials, structures and systems. Articles extending the frontiers of experimental mechanics at large and small scales are particularly welcome.
Coverage extends from research in solid and fluids mechanics to fields at the intersection of disciplines including physics, chemistry and biology. Development of new devices and technologies for metrology applications in a wide range of industrial sectors (e.g., manufacturing, high-performance materials, aerospace, information technology, medicine, energy and environmental technologies) is also covered.
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