Publication detail

Microstructural Interpretation of Effective Fatigue Threshold of Structural Steel

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

1

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"
}