Evaluation of Mechanical Integrity on the Brazing Joint of a Tube-Type Heat Exchanger With Considering Local Material Properties
17-227-3-420
03/01/2013
- Content
- Recently, the demands for eco-friendly and effective energy systems have rapidly increased due to global environment problems. A heat exchanger is a well-known mechanical rig that has been used for a long time in many energy systems to reduce heat energy loss and to increase energy efficiency. However, till now, there have been few attempts to install a heat exchanger inside of an airliner engine. In such a case, the heat exchanger should be designed to be compact, lightweight, and highly reliable; therefore, the issue of the mechanical integrity of the heat exchanger becomes very important. In this study, we suggest a method by which it is possible to evaluate the mechanical integrity of a tube-type heat exchanger using global and local analysis. In the global analysis, fluid-structure interaction was introduced to get global behavior of a tube, which was used as boundary conditions in the local analysis. Also, local material properties near a brazing joint were measured using a nano-indentation test, and then they were utilized in the local analysis to evaluate clearly stress distribution around the joint. Through this study, a U-shaped single tube brazed on a manifold, which is a segment of a tube-type heat exchanger, was used as an example; its fatigue limit and stress concentration on the joint depending on the change of fillet radius were estimated by the proposed approach.
- Citation
- Kang, S., Park, S., Min, J., Cho, J. et al., "Evaluation of Mechanical Integrity on the Brazing Joint of a Tube-Type Heat Exchanger With Considering Local Material Properties," SAE Technical Paper 17-227-3-420, 2013, .