An Energy Based Fatigue Lifing Method for In-Service Components and Numerical Assessment of U10Mo Alloy Based Fuel Mini Plates
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The Ohio State University / OhioLINK
2011
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=osu1309210033 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-osu13092100332021-08-03T06:03:15Z An Energy Based Fatigue Lifing Method for In-Service Components and Numerical Assessment of U10Mo Alloy Based Fuel Mini Plates Ozaltun, Hakan Mechanical Engineering hysteresis energy energy based fatigue hot isostatic pressing blister annealing thermal creep irradiation enhanced creep swelling An energy based fatigue life prediction framework has been developed for calculation of remaining fatigue life of in service gas turbine materials. The purpose of the life prediction framework is to account aging effect caused by cyclic loadings on fatigue strength of gas turbine engines structural components which are usually designed for very long life. Previous studies indicate the total strain energy dissipated during a monotonic fracture process and a cyclic process is a material property that can be determined by measuring the area underneath the monotonic true stress-strain curve and the sum of the area within each hysteresis loop in the cyclic process, respectively. The energy-based fatigue life prediction framework consists of the following entities: (1) development of a testing procedure to achieve plastic energy dissipation per life cycle and (2) incorporation of an energy-based fatigue life calculation scheme to determine the remaining fatigue life of in-service gas turbine materials. The accuracy of the remaining fatigue life prediction method was verified by comparison between model approximation and experimental results of Aluminum 6061-T6. The comparison has shown promising agreement, thus validating the capability of the framework to produce accurate fatigue life prediction. The second part of this dissertation is related to the development of a new Finite Element Methodology and lifing assessment for U10Mo Monolithic fuel mini plates subject to actual irradiation conditions. Three distinct stages were considered: (1) Fabrication induced residual stresses due to the high temperature exposure, (2) Blister annealing to check the structural stability of the fabricated plates with consideration of the residuals; and finally (3) in-reactor mechanical behavior with the consideration of irradiation induced phenomena. As the Hot Pressing temperature during the fabrication process approaches the melting temperature of the cladding material, using material properties at these temperatures were crucial for the accuracy of the residual stress field and for the subsequent simulations. In addition, since solid mechanical and fluid properties are temperature dependent, inter-disciplinary simulations had to be considered. Once residuals and plastic strains due to HIP (Hot Isostatic Pressing) process were identified via elasto-perfectly plastic model, solution was used as initial condition for the subsequent simulations. For Blister simulation, thermo-elasto-plastic material model with thermally induced creep was constructed and residuals due to the fabrication process from Step 1 were implemented accordingly. For irradiation (in-service) simulation, coupled fluid-thermal-structural interaction had to be considered due to the thermal dependency of the mechanical, thermal and fluid properties. Once the thermal field was identified on plates, this field was used to simulate the stress field with the consideration of thermal creep of cladding, irradiation induced creep and swelling of the fuel foil. The analysis showed that the residual stresses dominate the mechanical response of the plate. Even though, irradiation induced creep caused stress relaxation on the plates, swelling acted as a counter effect. 2011-09-12 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1309210033 http://rave.ohiolink.edu/etdc/view?acc_num=osu1309210033 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Mechanical Engineering hysteresis energy energy based fatigue hot isostatic pressing blister annealing thermal creep irradiation enhanced creep swelling |
| spellingShingle |
Mechanical Engineering hysteresis energy energy based fatigue hot isostatic pressing blister annealing thermal creep irradiation enhanced creep swelling Ozaltun, Hakan An Energy Based Fatigue Lifing Method for In-Service Components and Numerical Assessment of U10Mo Alloy Based Fuel Mini Plates |
| author |
Ozaltun, Hakan |
| author_facet |
Ozaltun, Hakan |
| author_sort |
Ozaltun, Hakan |
| title |
An Energy Based Fatigue Lifing Method for In-Service Components and Numerical Assessment of U10Mo Alloy Based Fuel Mini Plates |
| title_short |
An Energy Based Fatigue Lifing Method for In-Service Components and Numerical Assessment of U10Mo Alloy Based Fuel Mini Plates |
| title_full |
An Energy Based Fatigue Lifing Method for In-Service Components and Numerical Assessment of U10Mo Alloy Based Fuel Mini Plates |
| title_fullStr |
An Energy Based Fatigue Lifing Method for In-Service Components and Numerical Assessment of U10Mo Alloy Based Fuel Mini Plates |
| title_full_unstemmed |
An Energy Based Fatigue Lifing Method for In-Service Components and Numerical Assessment of U10Mo Alloy Based Fuel Mini Plates |
| title_sort |
energy based fatigue lifing method for in-service components and numerical assessment of u10mo alloy based fuel mini plates |
| publisher |
The Ohio State University / OhioLINK |
| publishDate |
2011 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1309210033 |
| work_keys_str_mv |
AT ozaltunhakan anenergybasedfatiguelifingmethodforinservicecomponentsandnumericalassessmentofu10moalloybasedfuelminiplates AT ozaltunhakan energybasedfatiguelifingmethodforinservicecomponentsandnumericalassessmentofu10moalloybasedfuelminiplates |
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