Ratcheting assessment of steel alloys under step-loading conditions |
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| Affiliation: | 1. Department of Chemical Engineering, National Institute of Technology Srinagar, Hazratbal 190 006, India;2. Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee 247 667, India;3. Department of Mechanical Engineering, National Institute of Technology Srinagar, Hazratbal 190 006, India;1. Motor Transport Institute, Warsaw 03-301, Poland;2. Institute of Fundamental Technological Research, Warsaw 02-106, Poland;1. School of Aerospace Science and Technology, Xidian University, Xi''an, Shanxi 710126, PR China;2. Department of Mechanics and Engineering Sciences, School of Civil Engineering and Mechanics, Key Laboratory of Mechanics on Environment and Disaster in Western China, The Ministry of Education of China, Lanzhou University, Lanzhou, Gansu 730000, PR China;3. School of Mechano-Electronic Engineering, Xidian University, Xi''an, Shanxi 710126, PR China;4. Science and Technology on Space Physics Laboratory, Beijing 100076, PR China;1. Faculty of Construction & Electricity, Ho Chi Minh City Open University, 97 Vo Van Tan Street, Ho Chi Minh City, Viet Nam;2. Department of Civil Engineering, International University – VNU HCMC, Viet Nam;3. Institute of Mechanics – VAST, 264 Doi Can, Hanoi, Viet Nam;4. Duy Tan University, Da Nang, Viet Nam;5. Department of Computational Engineering, Vietnamese-German University, Binh Duong New City, Viet Nam;1. Department of Astronautic Science and Mechanics, Harbin Institute of Technology, Harbin 150001, China;2. Department of Mechanical Engineering and Science, Kyoto University, Kyoto 615-8540, Japan;3. Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621900, China |
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| Abstract: | The present study examines the capability of a recently modified hardening rule to characterize ratcheting response of materials subjected to multi-step uniaxial stress cycles. The modified hardening rule was developed based on Armstrong–Frederick (A–F) hardening rule through implementing new ratcheting rate dependent coefficients γ2 and δ. These coefficients were estimated by means of calibrated curves for any given stress levels defined from the uniaxial single-step ratcheting response at various cyclic stress levels. At a constant mean stress, ratcheting strain progressively increased as stress amplitude over steps of loading history increased. Similar response was also evident for step-loading with constant stress amplitude while the values of mean stress increased. For high–low histories, the trend of predicted ratcheting strain from higher to lower magnitudes found agreeable with that of experimental data. The discrepancy of the predicted and experimentally ratcheting strain values in the high–low step loading however was due to constancy in the shape and size of translating yield surface in the modified kinematic hardening rule. The modified hardening rule was employed to assess ratcheting response of SS316L, SA333, SS316L(N) and 1070 steel alloys under various step-loading conditions. Predicted ratcheting data at various stress level were found in good agreements as compared with the experimental ratcheting strains. |
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| Keywords: | Ratcheting strain Mean stress Stress amplitude Single-/multi-step loading Loading sequence |
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