（1.School of Automotive and Information Engineering, Taizhou Vocational College of Science & Technology,Taizhou 318020, China; 2.Zhejiang Bondlye Environmental Technology Co.,Ltd., Taizhou 317000, China）


Abstract: Aiming at the cracking problem of platefin exhaust gas recycling（EGR） cooler, the fatigue analysis based on fluidsolid coupling was investigated and the design improvement was taken. The fluidsolid coupling process was built up based on Fluent and ABAQUS. The computational fluid dynamics and finite element calculation were carried out to study the relation between fluid temperature, heat transfer coefficient and solid temperature, thermal stress and stress amplitude. The crack on EGR cooler was proved to be a high stress low cycle fatigue fracture caused by calculation and SEM data. A design improvement was presented that additional pieceswere assembled on the each side of fins to reduce stress per unit area. The results indicate that the fluidsolid coupling thermal fatigue analysis is effective on fatigue analysis of EGR cooler.
Key words: fluidsolid coupling; exhaust gas recycling（EGR）cooler; failure analysis; fatigue crack