原文传递
Ultralow Cycle Fatigue Tests and Fracture Prediction Models for Duplex Stainless-Steel Devices of High Seismic Performance Braced Frames
| 题名： | Ultralow Cycle Fatigue Tests and Fracture Prediction Models for Duplex Stainless-Steel Devices of High Seismic Performance Braced Frames |
| 正文语种： | 英文 |
| 作者： | Marco Baiguera1; George Vasdravellis2; Theodore L. Karavasilis3 |
| 作者单位： | 1Research Associate, Dept. of Civil, Environmental, and Geomatic Engineering, Univ. College London, London WC1E 6BT, UK. 2Associate Professor, Institute for Infrastructure and Environment, Heriot-Watt Univ., Edinburgh EH14 4AS, UK (corresponding author). ORCID: 3Professor of Structures and Structural Mechanics, Faculty of Engineering and the Environment, Univ. of Southampton, Southampton SO17 1BJ, UK. |
| 关键词： | devices；calibration；loading；protocol；different；fatigue；prediction；palmgren；simulation；models |
| 摘要： | This paper presents ultralow cycle fatigue tests and the calibration of different fracture models for duplex stainless-steel devices of high seismic performance braced frames. Two different geometries of the devices were tested in full scale under 14 cyclic loading protocols up to fracture. The imposed protocols consisted of standard, constant-amplitude, and randomly generated loading histories. The test results show that the devices have stable hysteresis, high postyield stiffness, and large energy-dissipation and fracture capacities. Following the tests, two micromechanics-based models, i.e., the cyclic void growth model and the built-in ABAQUS ductile fracture model, were calibrated using monotonic and cyclic tests on circumferentially notched coupons and complementary finite-element simulations. In addition, Coffin-Mansonlike elationships were fitted to the results of the constant-amplitude tests of the devices, and the Palmgren-Miner’s rule was used to predict fracture of the devices under the randomly generated loading protocols. Comparisons of the experimental and numerical results show that the calibrated models can predict ductile fracture of the devices due to ultralow cycle fatigue with acceptable accuracy. |
| 出版年： | 2019 |
| 期刊名称： | Journal of Structural Engineering |
| 卷： | 145 |
| 期： | 1 |
| 页码： | 1-18 |
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