Thermal fatigue crack networks parameters and stability: an experimental study |
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| Affiliation: | 1. DMN/SRMA, CEA Saclay, 91191 Gif sur Yvette Cédex, France;2. DM2S/ SEMT, CEA Saclay, 91191 Gif sur Yvette Cédex, France;3. Ecole Centrale de Lille, Cité Scientifique BP 48, 59651 Villeneuve d’Ascq, France;1. Department of Mechanical Engineering, School of Mechanical Engineering, Dalian University of Technology, Room 217, Engineering Training Center, No. 2 Linggong Road, Ganjingzi, Dalian, Liaoning 116024, China;2. Department of Mechanical Engineering, School of Mechanical Engineering, Dalian University of Technology, Room 207, Engineering Training Center, No. 2 Linggong Road, Ganjingzi, Dalian, Liaoning 116024, China;3. Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan;1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;2. National Materials Corrosion and Protection Scientific Data Center, University of Science and Technology Beijing, Beijing 10083, China;1. Chemical & Materials Engineering, University of Alberta, Edmonton, T6G 2V4, Canada;2. Mechanical & Aerospace Engineering, Utah State University, Logan, UT 84322, USA;3. Manufacturing Engineering Technology, Weber State University, Ogden, UT 84403, USA;1. TNO, Department of Structural Dynamics, PO Box 6012, 2600 JA Delft, The Netherlands;2. Delft University of Technology, Faculty of Civil Engineering and Geosciences, PO Box 5048, 2600 GA Delft, The Netherlands;3. Eindhoven University of Technology, Faculty of Built Environment, PO Box 513, 5600 MB Eindhoven, The Netherlands;1. Siemens Corporate Technology, 5101 Westinghouse Boulevard, Charlotte, NC 28273, USA;2. Siemens Energy, Inc., 11842 Corporate Boulevard, Orlando, FL 32817, USA;3. Department of Aerospace Engineering, Mississippi State University, MS 39762, USA |
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| Abstract: | A thermal fatigue device––called SPLASH––similar to the facility developed by Marsh [Fatigue crack initiation and propagation in stainless steels subjected to thermal cycling, International Conference on Mechanical Behaviour and Nuclear Applications of Stainless Steels at Elevated Temperature, 1981] has been built in CEA/SRMA in 1985. Since then, it was used mostly on austenitic stainless steels to assess the initiation and growth of thermal fatigue crack networks. In 1998, a leak appeared in an auxiliary loop of the primary circuit of a pressurized water nuclear plant in Civaux (France). Thermal fatigue was suspected and studies began on AISI 304 L type austenitic stainless steel. They were eventually compared to results obtained earlier on AISI 316 L(N). First, the initiation conditions were determined and the damage before initiation was qualitatively observed. Then, some crack networks parameters were chosen and quantitatively determined by image analysis. This part of the study was done at the surface, during crack growth, and at the end of the tests, in depth. Finally, the stability of the crack networks obtained by thermal fatigue was tested under isothermal load controlled four point bending fatigue test, and some conclusions were drawn on the mechanisms of propagating crack selection. |
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