Publication detail

Progress in understanding of intrinsic resistance to shear-mode fatigue crack growth in metallic materials

VOJTEK, T. POKLUDA, J. HOHENWARTER, A. PIPPAN, R.

Original Title

Progress in understanding of intrinsic resistance to shear-mode fatigue crack growth in metallic materials

English Title

Progress in understanding of intrinsic resistance to shear-mode fatigue crack growth in metallic materials

Type

journal article in Web of Science

Language

en

Original Abstract

Recently made experiments allowed measurement of effective data (free of crack tip shielding) and enabled a better understanding of intrinsic behaviour of shear-mode cracks. Influence of crystal structure and microstructure was distinguished. Experimental results for niobium showed that growth micromechanisms and effective thresholds (ΔKIIeff,th ~ 1.0 MPa m1/2, ΔKIIIeff,th ~ 1.4 MPa m1/2) of modes II and III cracks were different, which was also observed in other metals. Validity of the simple formula for mode II effective threshold for single-phase metals based on the dislocation emission model was confirmed. The cracks propagated in a coplanar manner along the maximum shear plane, which is a characteristic behaviour for bcc metals. Model of propagation of remote mode III loaded cracks by local mode II advances was confirmed.

English abstract

Recently made experiments allowed measurement of effective data (free of crack tip shielding) and enabled a better understanding of intrinsic behaviour of shear-mode cracks. Influence of crystal structure and microstructure was distinguished. Experimental results for niobium showed that growth micromechanisms and effective thresholds (ΔKIIeff,th ~ 1.0 MPa m1/2, ΔKIIIeff,th ~ 1.4 MPa m1/2) of modes II and III cracks were different, which was also observed in other metals. Validity of the simple formula for mode II effective threshold for single-phase metals based on the dislocation emission model was confirmed. The cracks propagated in a coplanar manner along the maximum shear plane, which is a characteristic behaviour for bcc metals. Model of propagation of remote mode III loaded cracks by local mode II advances was confirmed.

Keywords

Modes II and III cracks, Effective threshold, Micromechanisms, 3D fractography, Niobium

Released

04.10.2016

Publisher

Elsevier

ISBN

0142-1123

Periodical

INTERNATIONAL JOURNAL OF FATIGUE

Year of study

89

Number

1

State

GB

Pages from

36

Pages to

42

Pages count

7

Documents

BibTex


@article{BUT129022,
  author="Tomáš {Vojtek} and Jaroslav {Pokluda} and Anton {Hohenwarter} and Reinhard {Pippan}",
  title="Progress in understanding of intrinsic resistance to shear-mode fatigue crack growth in metallic materials",
  annote="Recently made experiments allowed measurement of effective data (free of crack tip shielding) and
enabled a better understanding of intrinsic behaviour of shear-mode cracks. Influence of crystal structure
and microstructure was distinguished. Experimental results for niobium showed that growth
micromechanisms and effective thresholds (ΔKIIeff,th ~ 1.0 MPa m1/2, ΔKIIIeff,th ~ 1.4 MPa m1/2) of modes
II and III cracks were different, which was also observed in other metals. Validity of the simple formula
for mode II effective threshold for single-phase metals based on the dislocation emission model was confirmed.
The cracks propagated in a coplanar manner along the maximum shear plane, which is a characteristic
behaviour for bcc metals. Model of propagation of remote mode III loaded cracks by local mode II
advances was confirmed.",
  address="Elsevier",
  chapter="129022",
  doi="10.1016/j.ijfatigue.2016.01.009",
  institution="Elsevier",
  number="1",
  volume="89",
  year="2016",
  month="october",
  pages="36--42",
  publisher="Elsevier",
  type="journal article in Web of Science"
}