Residual strain distribution around a fatigue-crack tip determined by neutron diffraction
| Autor: | Kuan Wei Li, Yi Shiun Ding, Wan Chuck Woo, Soo Yeol Lee, E. Wen Huang, Chung-Hao Chen, L. W. Tsay |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Materials science
Orthogonal functions 304L stainless steel Crack growth resistance curve Neutron diffraction Stainless steel Strain Crack closure Residual stress mental disorders General Materials Science Fatigue crack propagation Composite material Stress intensity factor Stress concentration Crack tips Neutrons Multiaxiality Spatial resolution business.industry Crack propagation Mechanical Engineering Crack tip opening displacement Driving forces Structural engineering Paris' law Condensed Matter Physics Life-prediction methodology Plasticity testing Cyclic loadings Stress field Mechanics of Materials Fatigue crack growth mechanism Poisson distribution Residual strains Growth (materials) Factor analysis business Compact tension Fatigue of materials |
| Popis: | An analysis of residual stress, one of the contributory factors to the crack tip driving force, is extremely important to probe the fatigue crack growth mechanism and to further develop the life prediction methodology. Since fatigue crack growth is governed by crack-tip plasticity and crack closure in the wake of the crack tip, the investigation of residual stain/stress field in both behind and in front of the crack tip is crucial. In the current work, a 304L stainless steel compact-tension specimen is pre-cracked under constant-amplitude cyclic loading. Neutron diffraction is employed to directly measure the three orthogonal residual strain fields with 1-mm spatial resolution as a function of distance from the crack tip. The mapping results show that the three orthogonal residual-strain distributions around the crack tip depend on the stress multiaxiality, not following a single Poisson relationship to each axis. © 2012 Trans Tech Publications, Switzerland. 7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011, 1 August 2011 through 5 August 2011, Quebec City, QC |
| Databáze: | OpenAIRE |
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