Publication detail

Analysis of Roughness-Induced Crack-Tip Shielding in Terms of Size Ratio Effect

POKLUDA, J. ŠANDERA, P. HORNÍKOVÁ, J.

Original Title

Analysis of Roughness-Induced Crack-Tip Shielding in Terms of Size Ratio Effect

Type

journal article - other

Language

English

Original Abstract

A new theoretical concept is introduced to describe the roughness-induced shielding effects in metallic materials. It is based on the statistics of the local ratio between the characteristic microstructure distance and the plastic zone size. Both the crack branching and the crack closure phenomena are generally described in the frame of linear elastic fracture mechanics under the assumption of the remote Mode I loading. Using this approach, intrinsic values of fracture toughness and fatigue crack growth threshold can be determined, and the roughness-induced component can be separated from other closure components, such as plasticity or oxide induced closure. In order to estimate the total RIS effect, standard material data as the yield stress, the mean grain size, the surface roughness, and the fracture mode are only necessary. Application examples concerning static fracture and fatigue are presented for UHSLA steels, ARMCO iron, aluminum, and titanium alloys.

Keywords

roughness-induced shielding, crack branching, crack closure, size ratio, statistical approach

Authors

POKLUDA, J.; ŠANDERA, P.; HORNÍKOVÁ, J.

RIV year

2005

Released

1. 1. 2005

ISBN

1546-962X

Periodical

Journal of ASTM International

Year of study

2

Number

4

State

United States of America

Pages from

1

Pages to

15

Pages count

15

URL

http://www.astm.org/DIGITAL_LIBRARY/JOURNALS/JAI/PAGES/JAI11997.htm

BibTex

@article{BUT42830,
  author="Jaroslav {Pokluda} and Pavel {Šandera} and Jana {Horníková}",
  title="Analysis of Roughness-Induced Crack-Tip Shielding in Terms of Size Ratio Effect",
  journal="Journal of ASTM International",
  year="2005",
  volume="2",
  number="4",
  pages="1--15",
  issn="1546-962X",
  url="http://www.astm.org/DIGITAL_LIBRARY/JOURNALS/JAI/PAGES/JAI11997.htm"
}