Analysis and modeling of the failure behavior of carbonitrided parts
This work aims at a better understanding and modeling of the failure of carbonitrided pinions made out of 20MnB5 steel. Carbonitriding is a thermochemical treatment inducing high surface hardness while preserving significant core ductility. This results in graded microstructure and properties which...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Article |
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Elsevier
2019
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| Online Access: | http://hdl.handle.net/1721.1/120098 https://orcid.org/0000-0002-9060-227X |
| _version_ | 1826203556231774208 |
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| author | Karolak, Cyprien Montmitonnet, Pierre Parks, David Moore Delattre, Guillaume Bouchard, Pierre-Olivier |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Karolak, Cyprien Montmitonnet, Pierre Parks, David Moore Delattre, Guillaume Bouchard, Pierre-Olivier |
| author_sort | Karolak, Cyprien |
| collection | MIT |
| description | This work aims at a better understanding and modeling of the failure of carbonitrided pinions made out of 20MnB5 steel. Carbonitriding is a thermochemical treatment inducing high surface hardness while preserving significant core ductility. This results in graded microstructure and properties which makes the prediction of failure particularly complex: brittle external layer, ductile core material. A test bench was specifically designed to load one tooth of the studied pinions with a lateral force until complete failure. In situ observations were performed and the load-displacement curve recorded, showing a variety of behaviors as a function of the teeth engagement depth. The presence of the carbonitrided layer induces only a slight force and toughness increase. The main failure mechanism comes from shear failure of the ductile core material which will therefore be studied in this paper. Experimental tests with various stress states were conducted to measure plastic properties as well as to calibrate fracture criteria for the core steel. Von Mises plasticity and a simple strain hardening curve fit very well all these experiments. As fracture criteria from the literature were unable to predict failure correctly for all the mechanical tests, an adapted criterion has therefore been proposed as an outcome of this extensive mechanical testing campaign. Fracture simulations in LS Dyna were performed using the element erosion technique, the limitations of which are discussed. Comparison with the experimental tooth fracture allows evaluation of the proposed failure criteria, and enables to highlight and discuss the present limits of the simulation. Keywords: carbonitriding;
ductile - brittle failure; graded material; failure criteria; stress triaxiality ratio;
Lode parameter |
| first_indexed | 2024-09-23T12:39:26Z |
| format | Article |
| id | mit-1721.1/120098 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T12:39:26Z |
| publishDate | 2019 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | mit-1721.1/1200982022-10-01T10:18:35Z Analysis and modeling of the failure behavior of carbonitrided parts Karolak, Cyprien Montmitonnet, Pierre Parks, David Moore Delattre, Guillaume Bouchard, Pierre-Olivier Massachusetts Institute of Technology. Department of Mechanical Engineering Parks, David Moore This work aims at a better understanding and modeling of the failure of carbonitrided pinions made out of 20MnB5 steel. Carbonitriding is a thermochemical treatment inducing high surface hardness while preserving significant core ductility. This results in graded microstructure and properties which makes the prediction of failure particularly complex: brittle external layer, ductile core material. A test bench was specifically designed to load one tooth of the studied pinions with a lateral force until complete failure. In situ observations were performed and the load-displacement curve recorded, showing a variety of behaviors as a function of the teeth engagement depth. The presence of the carbonitrided layer induces only a slight force and toughness increase. The main failure mechanism comes from shear failure of the ductile core material which will therefore be studied in this paper. Experimental tests with various stress states were conducted to measure plastic properties as well as to calibrate fracture criteria for the core steel. Von Mises plasticity and a simple strain hardening curve fit very well all these experiments. As fracture criteria from the literature were unable to predict failure correctly for all the mechanical tests, an adapted criterion has therefore been proposed as an outcome of this extensive mechanical testing campaign. Fracture simulations in LS Dyna were performed using the element erosion technique, the limitations of which are discussed. Comparison with the experimental tooth fracture allows evaluation of the proposed failure criteria, and enables to highlight and discuss the present limits of the simulation. Keywords: carbonitriding; ductile - brittle failure; graded material; failure criteria; stress triaxiality ratio; Lode parameter 2019-01-17T21:11:12Z 2019-01-17T21:11:12Z 2017-11 2018-12-14T14:18:48Z Article http://purl.org/eprint/type/JournalArticle 1877-7058 http://hdl.handle.net/1721.1/120098 Karolak, Cyprien et al. “Analysis and Modeling of the Failure Behavior of Carbonitrided Parts.” Procedia Engineering 207 (2017): 2030–2035 © 2017 The Authors https://orcid.org/0000-0002-9060-227X http://dx.doi.org/10.1016/J.PROENG.2017.10.1103 Procedia Engineering Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Elsevier Elsevier |
| spellingShingle | Karolak, Cyprien Montmitonnet, Pierre Parks, David Moore Delattre, Guillaume Bouchard, Pierre-Olivier Analysis and modeling of the failure behavior of carbonitrided parts |
| title | Analysis and modeling of the failure behavior of carbonitrided parts |
| title_full | Analysis and modeling of the failure behavior of carbonitrided parts |
| title_fullStr | Analysis and modeling of the failure behavior of carbonitrided parts |
| title_full_unstemmed | Analysis and modeling of the failure behavior of carbonitrided parts |
| title_short | Analysis and modeling of the failure behavior of carbonitrided parts |
| title_sort | analysis and modeling of the failure behavior of carbonitrided parts |
| url | http://hdl.handle.net/1721.1/120098 https://orcid.org/0000-0002-9060-227X |
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