Loading sequence effect on fatigue life of Type 316 stainless steel |
| |
| Affiliation: | 1. Institute of Nuclear Safety System, Inc., 64 Sata, Mihama-cho, Mikata-gun, Fukui 919-1205, Japan;1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;2. CEMMPRE, Department of Mechanical Engineering, University of Coimbra, Rua Luís Reis Santos, Pinhal de Marrocos, 3030-788 Coimbra, Portugal;3. Department of Mechanical and Industrial Engineering, NTNU, 7491 Trondheim, Norway;4. UNIDEMI, Department of Mechanical and Industrial Engineering, Faculty of Sciences and Technology, Universidade Nova de Lisboa, 2829-516 Monte de Caparica, Portugal;1. TNO, Department of Structural Reliability, Delft, The Netherlands;2. TU/e, University of Technology Eindhoven, Faculty of the Built Environment, Eindhoven, The Netherlands;1. Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China;2. Advanced Nuclear Energy Research Team, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China;1. Imperial College London, Exhibition Road, London SW7 2BX, UK;2. Amirkabir University of Technology, Mechanical Engineering Department, Iran;1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;2. Collaborative Innovation Center of Universal Iron & Steel Technology, Beijing 100083, China |
| |
| Abstract: | The change in fatigue life due to variable cyclic loading was investigated experimentally in order to consider the loading sequence effect in fatigue damage assessment for a component design, and the reason for the change was discussed. Strain-controlled fatigue tests, that is, two-step, surface removal two-step, repeating two-step and periodical overload tests were conducted using Type 316 stainless steel specimen in a room temperature laboratory environment. The high-low loading amplitude sequence for the two-step test, and the repeating two-step and periodical overload tests showed a shorter fatigue life than that predicted by the linear damage accumulation rule. On the other hand, the low–high loading amplitude sequence for the two-step test exhibited a longer fatigue life. The reduction in the fatigue life was mainly attributed to the change in effective strain amplitude. The fatigue life reduction due to the loading sequence effect could be assessed conservatively by determining the allowable number of cycles for effective stress amplitude. Namely, by assuming the crack mouth was fully opened in the assessment, predicted fatigue life became shorter than the experimental results. It was concluded that the margin of 1.3–2.3 should be considered in the design fatigue curve in order to take account of the reduction in fatigue life due to the loading sequence effect. |
| |
| Keywords: | Loading sequence effect Variable loading Stainless steel Low-cycle fatigue Design fatigue curve |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
