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| Simulation Study of Thermomechanical Fatigue Failure of Diesel Exhaust Manifold |
| DOI：10.13949/j.cnki.nrjgc.2020.03.012 |
| Key Words:exhaust manifold thermomechanical fatigue simulation analysis diesel engine |
| Author Name | Affiliation | | YUAN Quan,WANG Xiaoyan,JI Hongbo,CHEN Xiaoping | 1.Hangzhou Bay Automotive Institute, Ningbo University of Technology, Ningbo 315336, China
2.State Key Laboratory of Engine Reliability, Weichai Power Co., Ltd., Weifang 261061, China |
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| Abstract:In view of the cracking of the exhaust manifold of a six-cylinder heavy duty diesel engine, the failure mechanism was studied by simulation analysis. Results show that under high load operating conditions, the pipe body is plastically deformed due to compressive stress, while under low load operatingconditions, the plastic deformation area cannot be restored to its original state in time and is instead subjected to tensile stress. Under the repeated action of such compressive and tensile stresses, fatigue cracks will occur in the pipe body. To this end, the Sehitoglu thermomechanical fatigue(TMF) theory is used to predict the life of the exhaust manifold. |
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