Brazing, as a type of welding process, is widely used in the joining industry to produce assembled products from two or more individual components. In the brazing process a filler metal, in the form of foil, wire, paste, plating, or powder, with a melting point of above 450°C and below the solidus of the base metal, is melted and distributed between the faying surfaces of the individual components to join them following solidification.
This research is motivated by the reliability analysis of a revolutionary laminated die which is consists of many layers joined to each other by the brazing process. Manufacturing dies in a cost and time-efficient way, the ease of producing complicated cavities, and possibility of embedding conformal cooling channels for optimum heat dissipation are the main advantages of the laminated dies. As these joints are the most probable regions where the die failure may occur, this research is focused on the strength and fatigue analysis of these interfacial brazed joints. history of copper nanoparticles
In this study for the strength and fatigue analysis of the brazed joints, a method called the Cohesive Zone Model (CZM) has been employed. The CZM concept provides an interfacial constitutive model by defining the relationship between traction and separation at the fracture process zone. Although this concept has been widely used as an alternative approach to the conventional fracture mechanics since 1960, its application to the fracture analysis of joints, such as adhesive bonding and soldering, has only recently been developed. In this research, the CZM is going to be implemented as the brazed joint constitutive model for the fracture analysis.
The CZM is characterized by the two parameters of cohesive strength,Tmax , and separation energy,Gc. Determination of these parameters is the key issue in the modeling of interfaces. The techniques presented for determination of these parameters are generally categorized into direct and indirect approaches. Direct approaches are those techniques in which all the CZM parameters are measured by experiments. However, employment of a simulation tool for prediction of interface behavior in combination with experimental measurements is the concept of indirect approaches.
Ghovanlou M.K., Jahed H., Khajepour A., Cohesive Zone Modeling of Ductile Tearing Process in Brazed Joints, Under review, 2012.
Ghovanlou M.K., Jahed H., Khajepour A., Mechanical reliability characterization of low carbon steel brazed joints with copper filler metal, Journal of Materials Science and Engineering A 528, Issue 15–20, pp. 6146-6156, 2011.
Ghovanlou M.K., Jahed H., Khajepour A., CZM Application to failure Analysis of Brazed Joints, 12th Int. Conference on Fracture ICF12, Ottawa, Canada, 2009.
Fatigue and Stress Analysis Lab E3-2137 University of Waterloo 200 University Avenue West Waterloo, Ontario N2L 3G1 Contact Hamid Jahed, Director, Fatigue and Stress Analysis Lab
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