Viscoplastic–plastic modelling of IN792

Almroth, Per; Hasselqvist, Magnus; Simonsson, Kjell; Sjöström, Sören

doi:10.1016/j.commatsci.2003.12.002

Cited by 13 publications

(10 citation statements)

References 8 publications

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“…4, the present monolithic IN792 creep data agree well with the data presented for cast IN792 in Ref. [20], except for the transition to a low stress exponent n$ 1 below an applied stress of 300 MPa at 850 1C which is expected to be associated with diffusional creep and is thus dependent on grain size. The strain rate _ e in this regime is given in Ref.…”

Section: Compressive Creepsupporting

confidence: 85%

Processing and compressive creep of cast replicated IN792 Ni-base superalloy foams

DeFouw

Dunand

2012

Materials Science and Engineering: A

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Section: Compressive Creepsupporting

confidence: 85%

Processing and compressive creep of cast replicated IN792 Ni-base superalloy foams

DeFouw

Dunand

2012

Materials Science and Engineering: A

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“…In such cases, one can let the radius of the static yield surface be zero, and bound the dynamic yield surface with a plastic surface f , cf. [59,60], where rate-dependent behaviour occur inside the plastic yield surface, and rate-independent deformations when the stress state is located on the plastic yield surface. For high loading rates and/or low temperature, which usually is the case in e.g.…”

Section: Modelling Frameworkmentioning

confidence: 99%

Fatigue life prediction of additively manufactured ductile nickel-based superalloys : Constitutive and crack initiation modelling

Lindström

2022

Linköping Studies in Science and Technology. Dissertations

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The first part of the research project, which resulted in the Paper I, Paper II and Paper III, has been funded by the Swedish Energy Agency and Siemens Energy AB (formerly Siemens Industrial Turbomachinery AB) through the research programme Turbines for Future Energy Systems (Turbiner för framtidens energisystem), the support of which is gratefully acknowledged. The remaining part of the project, resulting in Paper IV and Paper V, has been funded by Linköping University and Siemens Energy AB. First and foremost, I would like to thank my main supervisor Associate Prof. Daniel Leidermark for your patience, encouragement and enthusiasm, and for always taking time for discussions, guidance, or anything I have on my mind. Special thanks goes also to Lic. Eng. Daniel Nilsson for all support you have provided me with regarding testing, application near questions, and for making it possible for at least some of our work to be used in "reality". I would also like to thank my research group; Prof. Kjell Simonsson, Dr. Jan-Erik Lundgren and Associate Prof. Robert Eriksson for your valuable input and support through the project.In addition, I would like to thank all Ph.D. colleagues at the Division of Solid Mechanics for, most importantly, making the Ph.D. studies a lot more fun, but also for all valuable discussions. A special thanks goes to my office mate Jordi for all your help, both at office and outside of work.Last, but not least, I would like to thank my girlfriend Ida for all your support. As we started our Ph.D. journeys almost at the same time, it has been invaluable to have someone to discuss things with at any time. However, most importantly, thank you for making my time outside work much more joyful.

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“…plays a fundamental role to warranty components reliability. High strength materials are necessary to provide long components' life under elevated temperature [26][27][28]. Figure 6: Failure of turbine components [24,[25] For the previously described applications (IHX and gas turbine applications) good material candidates are austenitic, hardened superalloys [29].…”

Section: List Of Tablesmentioning

confidence: 99%

“…Table 7. (26) The MPE represents the average percentage error by which the numerical simulated data differ from the experimental data. Therefore the smaller the MPE, the more accurate the constitutive model is.…”

Section: Optimized Materials Constantsmentioning

confidence: 99%

Development of a Novel Hybrid Unified Viscoplastic Constitutive Model

Stewart

2015

Volume 9: Mechanics of Solids, Structures and Fluids

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2015Dedicado a mi familia, a los de aquí y a los que desde arriba siguen aquí. v ACKNOWLEDGEMENTS I would like to thank my advisor Dr. Calvin M. Stewart, whose guidance and advice was fundamental to complete my master degree. It has been an honor to work and learn from such a professional advisor. I want to state my gratitude to the Mechanical Engineering Department for all the opportunities that have been provided to me which have tremendously contributed to my professional career. Finally I would like to thank my family for being my inspiration and for all the provided support. vi ABSTRACT Gas turbines are now days used in power plants for power generation and for propulsion in the aerospace industry. In these applications gas turbines are exposed to severe temperature and pressure variations during operating cycles. These severe operating conditions exposed the turbine's components to multiple deformation mechanisms which degrade the material and eventually lead to failure of the components. Nickel based and austenitic super alloys are candidate material used for these applications due to its high strength and corrosion resistance at elevated temperatures. At such temperature levels, candidate materials exhibit a rate-dependent or viscoplastic behavior which difficult the prediction or description of the material response due to deformation mechanisms. Unified viscoplastic constitutive models are used to describe this viscoplastic behavior of materials. In the present work Miller and Walker unified viscoplastic models are presented, described and exercised to model the creep of Hastelloy X and the low cycle fatigue behavior of stainless steel 304. The numerical simulation results are compared to an extensive database of experimental data to fully validate the capabilities and limitations of the considered models. Material constant heuristic optimizer (MACHO) software is explained and used to determine both models material constants and ensure a systematic calculation of them.This software uses the simulated annealing algorithm to determine the optimal material constants values in a global surface, by comparing numerical simulations to an extensive database of experimental data. A quantitative analysis on the performance of both models is conducted to determine the most suitable model to predict material's behavior. Based on the two exercised classical viscoplastic models, a novel hybrid unified model is introduced, to accurately describe the inelastic behavior caused by creep and fatigue effects at high temperature. The presented

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Viscoplastic–plastic modelling of IN792

Cited by 13 publications

References 8 publications

Processing and compressive creep of cast replicated IN792 Ni-base superalloy foams

Processing and compressive creep of cast replicated IN792 Ni-base superalloy foams

Fatigue life prediction of additively manufactured ductile nickel-based superalloys : Constitutive and crack initiation modelling

Development of a Novel Hybrid Unified Viscoplastic Constitutive Model

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