Institute of Physics of Materials AS CR, v. v. i. > Projects > Localization and irreversibility of cyclic slip in polycrystals

Localization and irreversibility of cyclic slip in polycrystals

InvestigatorIng. Jiří Man, Ph.D.
Number of ProjectP108/10/2371
AgencyGrantová agentura České republiky
Duration2009-12-31 - 2013-12-30

Anotace
The project is focused on the revealing and explanation of the fundamental micromechanisms of the localized
cyclic plastic straining in polycrystalline materials resulting in the early fatigue damage and leading to fatigue
crack initiation. The study of the evolution of the internal dislocation structure and of the development of
surface relief at ambient and depressed temperatures aims to clarify the role of point defects in the formation of
specific surface relief. Slip activity and slip irreversibility in persistent slip bands (PSBs) in dependence on the
crystallographic orientation will be studied in two materials with different stacking fault energy (polycrystalline
copper and 316L steel). Modern high resolution techniques as e.g. AFM (atomic force microscopy), EBSD
(electron back scattering), FIB (focused ion beam) etc. will be adopted. Analysis of experimental data and the
comparison with models of localized cyclic plastic straining and crack initiation leads to more thorough
understanding of the damage mechanisms and represents further stimulus for fatigue damage modeling.


2015

Man J., Valtr M., Petrenec M., Dluhoš J., Kuběna I., Obrtlík K., Polák J.: AFM and SEM-FEG study on fundamental mechanisms leading to fatigue crack initiation. Int. J. Fatigue 76 (2015) 11-18



2014

Polák J., Man J.: Cyclic slip localization and crack initiation in crystalline materials. Adv. Mater. Res. 891-892 (2014) 452-457

Man J., Valtr M., Kuběna I., Petrenec M., Obrtlík K., Polák J.: AFM and FIB study of cyclic strain localization and surface relief evolution in fatigued f.c.c. polycrystals. Adv. Mater. Res. 891-892 (2014) 524-529

Man J., Weidner A., Klapetek P., Polák J.: Slip activity of persistent slip bands in early stages of fatigue life of austenitic 316L steel. Key Eng. Mater. 592-593 (2014) 785-788

Polák J., Man J.: Fatigue crack initiation - The role of point defects. Int. J. Fatigue 65 (2014) 18-27

Polák J., Man J.: Mechanisms of extrusion and intrusion formation in fatigued crystalline materials. Mater. Sci. Eng. A 596 (2014) 15-24

Polák J., Man J., Kuběna I.: The true shape of persistent slip markings in fatigued metals. Key Eng. Mater. 592-593 (2014) 781-784



2013

Polák J., Kuběna I., Man J.: The shape of early persistent slip markings in fatigued 316L steel. Mater. Sci. Eng. A 564 (2013) 8-12



2012

Polák J., Man J., Petrenec M., Tobiáš J.: Fatigue behavior of ferritic-pearlitic-bainitic steel in loading with positive mean stress. Int. J. Fatigue 39 (2012) 103-108

Man J., Vystavěl T., Weidner A., Kuběna I., Petrenec M., Kruml T., Polák J.: Study of cyclic strain localization and fatigue crack initiation using FIB technique. Int. J. Fatigue 39 (2012) 44-53



2011

Man J., Obrtlík K., Petrenec M., Beran P., Smaga M., Weidner A., Dluhoš J., Kruml T., Biermann H., Eifler D., Polák J.: Stability of austenitic 316L stainless steel against martensite formation during cyclic straining. Procedia Eng. 10 (2011) 1279-1284

Polák J., Petrenec M., Kruml T., Chlupová A.: Cyclic plastic response and fatigue life in symmetric and asymmetric cyclic loading. Procedia Eng. 10 (2011) 568-577



2010

Man J., Valtr M., Weidner A., Petrenec M., Obrtlík K., Polák J.: AFM study of surface relief evolution in 316L steel fatigued at low and high temperatures. Proc. Eng. 2 (2010) 1625-1633