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POKLUDA, J. KONDO, Y. SLÁMEČKA, K. KOZÁK, V. HORNÍKOVÁ, J. ŠANDERA, P.
Original Title
Microstructural Interpretation of Effective Fatigue Threshold of Structural Steel
Type
conference paper
Language
English
Original Abstract
In the case of plain strain conditions, the shear misfit of crack flanks causing the rough-ness-induced crack closure is determined by the asymmetry of configurations of crack-wake dislo-cations and by a low value of the size ratio SR (the plastic zone size/the characteristic microstruc-tural distance). The crack wake dislocations produce also the plasticity induced crack closure as a result of a near-tip mismatch perpendicular to crack flanks. These extrinsic shielding effects can be quantitatively estimated according to recently published theoretical concepts [1-3] that were ap-plied to the austenitic steel of Japan provenience in the threshold region of fatigue crack propaga-tion. Related fatigue experiments were based on a standard load shedding technique associated with monitoring of the crack closure level. The surface roughness was analysed by means of the optical chromatography that enables a 3D reconstruction of fracture morphology. Calculated and measured effective threshold values of about 2.2 MPa.m1/2 are practically identical. Total levels of the extrin-sic toughening induced by the austenitic microstructure are rather low when compared to those identified in ferritic- and ferritic-austenitic steels.
Keywords
Microstructure, Effective Fatigue Threshold, Structural Steel
Authors
POKLUDA, J.; KONDO, Y.; SLÁMEČKA, K.; KOZÁK, V.; HORNÍKOVÁ, J.; ŠANDERA, P.
RIV year
2008
Released
2. 9. 2008
Publisher
Vutium
Location
Brno
ISBN
9781617823190
Book
Multilevel Approach to Fracture of Materials, Components and Structures (ECF17)
Edition
1
Edition number
Pages from
2216
Pages to
2219
Pages count
4
BibTex
@inproceedings{BUT27176, author="Jaroslav {Pokluda} and Yoshiyuki {Kondo} and Karel {Slámečka} and Vladislav {Kozák} and Jana {Horníková} and Pavel {Šandera}", title="Microstructural Interpretation of Effective Fatigue Threshold of Structural Steel", booktitle="Multilevel Approach to Fracture of Materials, Components and Structures (ECF17)", year="2008", series="1", number="1", pages="2216--2219", publisher="Vutium", address="Brno", isbn="9781617823190" }