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Thermomechanical Behavior of an Automotive Exhaust Aftertreatment Application
Technical Paper
2022-01-0277
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
An aftertreatment system is the back-end component of an automotive exhaust system, used mainly to reduce pollutant emissions. This system is exposed to high thermal loads which can exceed temperatures of 900 oC, usually they operate at temperatures under 600 oC - 700 oC, depending on the engine application. The durability assessment of a system under thermomechanical loads can be challenging due to the complexity of the technical problem, which involves complex material behavior at high temperatures and results in high thermomechanical strains and stresses. This study presents a computational approach for the lifetime assessment of an exhaust aftertreatment system subjected to thermomechanical loading. The method is composed of a fluid flow analysis to compute the temperature fields which are mapped to a mechanical analysis combined with a nonlinear elasto-viscoplastic material behavior. Lastly, the lifetime of the overall assembly is assessed through a fatigue analysis. The elasto-viscoplastic constitutive laws for the ferritic stainless steel EN 1.4509 are identified and a unified model for cyclic viscoplasticity based on the nonlinear kinematic hardening rule is implemented in ANSYS and the lifetime of the product is assessed. It is demonstrated how the lifetime of a product can be assessed by applying the afore mentioned computational approach. This method enables detailed prediction of strain and stress levels at high temperatures which using traditional test methods cannot be assessed. This computation approach will lead to shorter development time of products and will speed up its availability on the market.
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Serban, A., "Thermomechanical Behavior of an Automotive Exhaust Aftertreatment Application," SAE Technical Paper 2022-01-0277, 2022, https://doi.org/10.4271/2022-01-0277.Also In
References
- Novak , J.S. 2016
- Lemaitre , J. Handbook of Materials Behavior Models, Three-Volume Set: Nonlinear Models and Properties Elsevier 2001 978-0-12-443341-0
- Chaboche , J.L. A review of Some Plasticity and Viscoplasticity Constitutive Theories International Journal of Plasticity 24 10 2008 1642 1693 10.1016/j.ijplas.2008.03.009
- Lee , Y.L. , Pan , J. , Hathaway , R. , and Barkey , M. Fatigue Testing and Analysis: Theory and Practice 13 Butterworth-Heinemann 2005 0-7506-7719-8
- Cui , W. A State-of-the-Art Review on Fatigue Life Prediction Methods for Metal Structures Journal of Marine Science and Technology 7 2002 43 56 10.1007/s007730200012
- Meggiolaro , M.A. and Castro , J.T.P. Statistical Evaluation of Strain-Life Fatigue Crack Initiation Predictions International Journal of Fatigue 26 5 2004 463 476 10.1016/j.ijfatigue.2003.10.003
- Robin , M.C. , Delagnes , D. , Logé , R. , Bouchard , P.O. et al. Thermo-Mechanical Fatigue Behaviour of Welded Tubular Parts Made of Ferritic Stainless Steel International Journal of Fatigue 54 2013 84 98 10.1016/j.ijfatigue.2013.04.004
- Bucher , L. , Santacreu , P.O. , Köster , A. , and Remy , L. Elasto-Viscoplastic Behavior of the Ferritic Stainless Steel AISI 441-EN 1.4509 from Room Temperature to 850 C Journal of ASTM International 3 7 2006 1 6 10.1520/JAI13197
- Rémy , L. , Szmytka , F. , and Bucher , L. Constitutive Models for bcc Engineering Iron Alloys Exposed to Thermal-Mechanical Fatigue International Journal of Fatigue 53 2013 2 14 10.1016/j.ijfatigue.2011.11.007
- Aperam https://www.aperam.com/sites/default/files/documents/FT_K41_en_web.pdf Sept. 2021
- Wei , Z. , Konson , D. , Clark , D. , Luo , L. et al. Characterization and Ranking of Materials for Exhaust Systems Under Thermal-Cycling Condition SAE Technical Paper 2013-01-0512 2013 https://doi.org/10.4271/2013-01-0512
- Ekström , M. and Jonsson , S. High-Temperature Mechanical- and Fatigue Properties of Cast Alloys Intended for Use in Exhaust Manifolds Materials Science and Engineering: A 616 2014 78 87 10.1016/j.msea.2014.08.014
- Von Hartrott , P. , Cueva , A. , and Ohmenhäuser , F. Lifetime Estimation of High-Temperature Components Made of Ferritic Sheet Metal MTZ Worldw 74 2013 66 71 10.1007/s38313-013-0104-6
- Constantinescu , A. , Charkaluk , E. , Lederer , G. , and Verger , L. A Computational Approach to thermomechanical Fatigue International Journal of Fatigue 26 8 2004 805 818 10.1016/j.ijfatigue.2004.01.006
- ANSYS Workbench (Version 18.2) 2018
- Solidworks Flow Simulation (version 2018) 2018
- Santacreu , P.O. , Simon , C. , and Coleman , A. Thermomechanical Fatigue Behavior of Stainless Steel Grades for Automotive Exhaust Manifold Applications Thermomechanical Fatigue Behavior of Materials 4 (ASTM International) 2003 10.1520/STP11437S