Cyclic slip localization and crack initiation in crystalline materials

0435388 - ÚFM 2015 RIV CH eng C - Conference Paper (international conference)
Polák, Jaroslav - Man, Jiří
Cyclic slip localization and crack initiation in crystalline materials.
11th International Fatigue Congress. Zurich: Trans Tech Publications, 2014 - (Clark, G.; Wang, C.), s. 452-457. Advanced Materials Research, 891-892. ISBN 978-3-03835-008-8. ISSN 1022-6680.
[Fatigue 2014 - International Fatigue Congress /11./. Melbourne (AU), 02.03.2014-07.03.2014]
R&D Projects: GA ČR(CZ) GAP108/10/2371; GA ČR(CZ) GA13-23652S
Institutional support: RVO:68081723
Keywords : fatigue * strain localization * persistent slip band * crack initiation * persistent slip marking
Subject RIV: JL - Materials Fatigue, Friction Mechanics

Cyclic plastic straining in crystalline materials is localized to persistent slip bands (PSBs) and results in formation of persistent slip markings (PSMs) consisting of extrusions and intrusions. Intensive plastic strain in PSBs results in dislocation interactions and formation of point defects. The extended model based on point defect formation, migration and annihilation is presented describing surface relief formation in the form of extrusion-intrusion pairs. Point defect migration and resulting mass transfer is the principle source of cyclic slip irreversibility leading to crack-like defects - intrusions. Fatigue cracks start in the tip of sharp intrusions.
Permanent Link: http://hdl.handle.net/11104/0239283