High cycle fatigue and ratcheting interaction of laser powder bed fusion stainless steel 316L : fracture behaviour and stress-based modelling
Variations in the physical and mechanical properties of parts made by laser power bed fusion (L-PBF) could be affected by the choice of processing or post-processing strategies. This work examined the influence of build orientation and post-processing treatments (annealing or hot isostatic pressing)...
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sg-ntu-dr.10356-1412832020-09-26T22:06:18Z High cycle fatigue and ratcheting interaction of laser powder bed fusion stainless steel 316L : fracture behaviour and stress-based modelling Zhang, Meng Sun, Chen-Nan Zhang, Xiang Wei, Jun Hardacre, David Li, Hua School of Mechanical and Aerospace Engineering Singapore Centre for 3D Printing Singapore Institute of Manufacturing Technology Engineering::Mechanical engineering High Cycle Fatigue Ratcheting Variations in the physical and mechanical properties of parts made by laser power bed fusion (L-PBF) could be affected by the choice of processing or post-processing strategies. This work examined the influence of build orientation and post-processing treatments (annealing or hot isostatic pressing) on the fatigue and fracture behaviours of L-PBF stainless steel 316L in the high cycle fatigue region, i.e. 104 – 106 cycles. Experimental results show that both factors introduce significant changes in the plastic deformation properties, which affect fatigue strength via the mechanism of fatigue-ratcheting interaction. Cyclic plasticity is characterised by hardening, which promotes mean stress insensitivity and improved fatigue resistance. Fatigue activities, involving the initiation of crack at defects and microstructural heterogeneities, are of greater relevance to the longer life region where the global deformation mode is elastic. As the simultaneous actions of ratcheting and fatigue generate complex nonlinear interactions between the alternating stress amplitude and mean stress, the fatigue properties could not be effectively predicted using traditional stress-based models. A modification to the Goodman relation was proposed to account for the added effects of cyclic plasticity and was demonstrated to produce good agreement with experimental results for both cyclic hardening and softening materials. EDB (Economic Devt. Board, S’pore) Accepted version 2020-06-05T08:16:04Z 2020-06-05T08:16:04Z 2018 Journal Article Zhang, M., Sun, C.-N., Zhang, X., Wei, J., Hardacre, D., & Li, H. (2019). High cycle fatigue and ratcheting interaction of laser powder bed fusion stainless steel 316L : fracture behaviour and stress-based modelling. International Journal of Fatigue, 121, 252-264. doi:10.1016/j.ijfatigue.2018.12.016 0142-1123 https://hdl.handle.net/10356/141283 10.1016/j.ijfatigue.2018.12.016 121 252 264 en International Journal of Fatigue © 2018 Elsevier Ltd. All rights reserved. This paper was published in International Journal of Fatigue and is made available with permission of Elsevier Ltd. application/pdf |
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Engineering::Mechanical engineering High Cycle Fatigue Ratcheting Zhang, Meng Sun, Chen-Nan Zhang, Xiang Wei, Jun Hardacre, David Li, Hua High cycle fatigue and ratcheting interaction of laser powder bed fusion stainless steel 316L : fracture behaviour and stress-based modelling |
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Variations in the physical and mechanical properties of parts made by laser power bed fusion (L-PBF) could be affected by the choice of processing or post-processing strategies. This work examined the influence of build orientation and post-processing treatments (annealing or hot isostatic pressing) on the fatigue and fracture behaviours of L-PBF stainless steel 316L in the high cycle fatigue region, i.e. 104 – 106 cycles. Experimental results show that both factors introduce significant changes in the plastic deformation properties, which affect fatigue strength via the mechanism of fatigue-ratcheting interaction. Cyclic plasticity is characterised by hardening, which promotes mean stress insensitivity and improved fatigue resistance. Fatigue activities, involving the initiation of crack at defects and microstructural heterogeneities, are of greater relevance to the longer life region where the global deformation mode is elastic. As the simultaneous actions of ratcheting and fatigue generate complex nonlinear interactions between the alternating stress amplitude and mean stress, the fatigue properties could not be effectively predicted using traditional stress-based models. A modification to the Goodman relation was proposed to account for the added effects of cyclic plasticity and was demonstrated to produce good agreement with experimental results for both cyclic hardening and softening materials. |
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School of Mechanical and Aerospace Engineering |
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School of Mechanical and Aerospace Engineering Zhang, Meng Sun, Chen-Nan Zhang, Xiang Wei, Jun Hardacre, David Li, Hua |
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Article |
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Zhang, Meng Sun, Chen-Nan Zhang, Xiang Wei, Jun Hardacre, David Li, Hua |
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Zhang, Meng |
title |
High cycle fatigue and ratcheting interaction of laser powder bed fusion stainless steel 316L : fracture behaviour and stress-based modelling |
title_short |
High cycle fatigue and ratcheting interaction of laser powder bed fusion stainless steel 316L : fracture behaviour and stress-based modelling |
title_full |
High cycle fatigue and ratcheting interaction of laser powder bed fusion stainless steel 316L : fracture behaviour and stress-based modelling |
title_fullStr |
High cycle fatigue and ratcheting interaction of laser powder bed fusion stainless steel 316L : fracture behaviour and stress-based modelling |
title_full_unstemmed |
High cycle fatigue and ratcheting interaction of laser powder bed fusion stainless steel 316L : fracture behaviour and stress-based modelling |
title_sort |
high cycle fatigue and ratcheting interaction of laser powder bed fusion stainless steel 316l : fracture behaviour and stress-based modelling |
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2020 |
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https://hdl.handle.net/10356/141283 |
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1681057434618036224 |