使用纳米压痕仪和有限元分析对c-Al0.66 Ti0.33 N- M2钢系统进行理论-实验失效分析
Theoretical-Experimental failure analysis of the c-Al0.66Ti0.33N-M2 steel system using nanoindentation instrumented and finite element analysis
摘要：
提出了一种c-Al 0. 66 Ti 0. 33 N/ Interface / M2钢涂层系统失效分析的理论-实验方法。该c-Al_（0. 66）Ti_（0. 33）N涂层采用电弧-PVD技术沉积。涂层模型采用牵引-分离定律和扩展有限元法（XFEM），界面模型采用内聚区模型，基体模型采用Ramberg-Osgood定律。利用仪器化纳米压痕技术、划痕试验和拉应力试验获得了实验值，并将其引入模型。采用纳米压痕法测量了涂层的弹性模量、断裂能释放率和纳米硬度。通过划痕试验得到了界面在粘着和内聚临界载荷下的法向应力和剪应力值。采用维氏压痕法在c-Al 0. 66 Ti 0. 33 N/ Interface / M2钢涂层系统中产生裂纹图案。径向和横向裂纹产生和分析后，横向纤维束切割的断裂区。进行了有限元分析，以了解系统中的载荷-位移曲线和机械失效之间的关系，将弹出与成核、裂纹扩展和开裂模式相关联。这项工作提出了一种理论实验方法，用于硬涂层（整体）的失效分析，允许计算涂层材料的断裂韧性和模型接触力学引起的开裂模式。
英文摘要：
A theoretical-experimental methodology for failure analysis of the c-Al0.66Ti0.33N / Interface / M2 steel coating system is proposed here. This c-Al0.66Ti0.33N coating was deposited by the arc-PVD technique. For coating modeling the traction-separation law and the extended finite element method-XFEM were applied, the cohesive zones model was used for interface modeling and the Ramberg-Osgood law for substrate modeling. Experimental values using the instrumented nanoindentation technique, the scratch test and tensile stress test were obtained and introduced into the model. By means of nanoindentation the elastic modulus of coating, the fracture energy release rate and the nano-hardness. Normal and shear stress values of the interface were obtained with the scratch test, at the adhesive and cohesive critical loads. Vickers indentation was used to generate cracking patterns in the c-Al0.66Ti0.33N / Interface / M2 steel coating system. Radial and lateral cracks were generated and analyzed after transversal FIB cuts of the fracture zones. A finite element analysis was carried out to understand the relationship between the load-displacement curve and mechanical failure of in the system, associating the pop-in with nucleation, crack growth and cracking pattern. This works present a theoretical-experimental methodology for failure analysis of hard coatings (monolithic body) allowing to calculate fracture toughness of the coating material and model cracking patterns caused by contact mechanics.
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