Fatigue crack growth under non-proportional mixed-mode I + II. Role of compression while shearing
| Autor: | Si Hai Mai, Véronique Doquet, Thomas Bonniot |
|---|---|
| Přispěvatelé: | Laboratoire de mécanique des solides (LMS), École polytechnique (X)-MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), SNCF : Innovation & Recherche, SNCF |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
wear
Materials science friction rail steel 02 engineering and technology Plasticity Industrial and Manufacturing Engineering [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph] 0203 mechanical engineering General Materials Science Growth rate mixed-mode I + II Non proportional Bifurcation Shearing (physics) Mechanical Engineering Mechanics Paris' law 021001 nanoscience & nanotechnology Mixed mode Critical value 020303 mechanical engineering & transports Mechanics of Materials Modeling and Simulation Fatigue crack 0210 nano-technology |
| Zdroj: | International Journal of Fatigue International Journal of Fatigue, Elsevier, 2020, 134, pp.105513. ⟨10.1016/j.ijfatigue.2020.105513⟩ |
| ISSN: | 0142-1123 |
| Popis: | Mode I + II fatigue crack growth tests are run, following sequential or pseudo-sequential loading paths, representative of those computed for ”squat type” cracks in rails. Stereo DIC provides the near-tip displacements, from which Δ K I effective and Δ K II effective are derived. Compression while shearing extends coplanar growth, by slowing down the wear-induced rise of the effective mode mixity ratio, up to the critical value for which bifurcation occurs. The consideration of plasticity and contact and friction stresses improves crack paths predictions, compared to the maximum tangential stress criterion. The coplanar crack growth rate correlates well with a combination of Δ K I effective and Δ K II effective . |
| Databáze: | OpenAIRE |
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