Publication detail

Near-Threshold Propagation of Mode II and Mode III Cracks

HOLÁŇ, L. PIPPAN, R. POKLUDA, J. HORNÍKOVÁ, J. HOHENWARTER, A. SLÁMEČKA, K.

Original Title

Near-Threshold Propagation of Mode II and Mode III Cracks

Type

conference paper

Language

English

Original Abstract

Two prototype experiments allowing a simultaneous mode II and mode III fatigue crack propagation in a single specimen are described and the differences in related to growth are discussed. The cylindrical specimens made of austenitic and ferritic steels with circumferential V-notch were prepared. The specially manufactured loading setups enabled to assure a pure remote shear mode II at both the top and the bottom sites of the specimen, whereas a pure mode III operated at front and back sites. Differences between the mechanisms of crack propagation were assessed by means of the 3D fractographical analysis based on the stereophotogrammetry in SEM. The stress intensity factors KII and KIII were determined by a numerical method based on the ANSYS code and compared with asymptotically computed values of KIII. The threshold values \Delta KIIth (R = 0.1) were found to be of 1.2 MPam1/2 in ferrite and of 3.5 MPam1/2 in austenite, whereas \Delta KIIIth=2.0 in ferrite and \Delta KIIIth = 4.7 MPam1/2 in austenite. In both steels, the near-threshold crack growth rate under the mode II was found to be much higher than that under the mode III.

Keywords

crack paths, threshold, fatigue

Authors

HOLÁŇ, L.; PIPPAN, R.; POKLUDA, J.; HORNÍKOVÁ, J.; HOHENWARTER, A.; SLÁMEČKA, K.

RIV year

2009

Released

1. 10. 2009

Publisher

University of Parma

Location

Vicenza, Italy

ISBN

0000000000000

Book

Crack Paths

Pages from

585

Pages to

592

Pages count

8

BibTex

@inproceedings{BUT30036,
  author="Libor {Holáň} and Reinhard {Pippan} and Jaroslav {Pokluda} and Jana {Horníková} and Anton {Hohenwarter} and Karel {Slámečka}",
  title="Near-Threshold Propagation of Mode II and Mode III Cracks",
  booktitle="Crack Paths",
  year="2009",
  pages="585--592",
  publisher="University of Parma",
  address="Vicenza, Italy",
  isbn="0000000000000"
}