| タイトル | Modeling the Interactions Between Multiple Crack Closure Mechanisms at Threshold |
| 本文（外部サイト） | http://hdl.handle.net/2060/20030053073 |
| 著者（英） | Riddell, William T.; Newman, John A.; Piascik, Robert S. |
| 著者所属（英） | Army Research Lab. |
| 発行日 | 2003-05-01 |
| 言語 | eng |
| 内容記述 | A fatigue crack closure model is developed that includes interactions between the three closure mechanisms most likely to occur at threshold; plasticity, roughness, and oxide. This model, herein referred to as the CROP model (for Closure, Roughness, Oxide, and Plasticity), also includes the effects of out-of plane cracking and multi-axial loading. These features make the CROP closure model uniquely suited for, but not limited to, threshold applications. Rough cracks are idealized here as two-dimensional sawtooths, whose geometry induces mixed-mode crack- tip stresses. Continuum mechanics and crack-tip dislocation concepts are combined to relate crack face displacements to crack-tip loads. Geometric criteria are used to determine closure loads from crack-face displacements. Finite element results, used to verify model predictions, provide critical information about the locations where crack closure occurs. |
| NASA分類 | Structural Mechanics |
| レポートNO | ARL-TR-2959
NASA/TM-2003-212402
NAS 1.15:212402
L-18279 |
| 権利 | No Copyright |
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