Detail publikace

Near-threshold Fatigue Crack Propagation under Mixed-mode II+III in ARMCO Iron

VOJTEK, T. POKLUDA, J. ŠANDERA, P. HORNÍKOVÁ, J. SLÁMEČKA, K. PIPPAN, R. HOHENWARTER, A.

Originální název

Near-threshold Fatigue Crack Propagation under Mixed-mode II+III in ARMCO Iron

Typ

článek ve sborníku ve WoS nebo Scopus

Jazyk

angličtina

Originální abstrakt

The paper is dedicated to experiments on near-threshold fatigue cracks under mixed-mode II+III in the ARMCO iron. The aim is to find the intrinsic (effective) threshold value of stress intensity factor (SIF) range in the mixed mode II+III and to compare it to those in modes II, III as well as to elucidate the crack growth mechanism. In this paper we only focus on the mixed-mode II+III experiment. Cylindrical bars with circumferential cracked notch were loaded by shear force. The notch is located in the middle of the bar and, therefore, no bending moment is present. Pre-cracks were created by compressive cyclic loading in mode I to obtain smooth fracture surfaces. After the experiment, the specimens were fractured under very low temperature or by cyclic tensile loading. The circumferential crack was loaded by different combination of modes II and III. The SIFs in mode II and III were numerically calculated using FEM. Two simple formulae were used to evaluate the effective mixed-mode SIF. The crack path and the surface topography were studied by means of a 3D reconstruction of fracture surfaces using stereo pairs of SEM images of the fracture surface (stereophotogrammetry in SEM). Differences between crack paths (and associated morphologies) under modes II, III and II+III were analyzed and statistically described in terms of local inclination and twisting angles.

Klíčová slova

mixed mode, stress intensity factor, crack growth, ARMCO iron

Autoři

VOJTEK, T.; POKLUDA, J.; ŠANDERA, P.; HORNÍKOVÁ, J.; SLÁMEČKA, K.; PIPPAN, R.; HOHENWARTER, A.

Rok RIV

2012

Vydáno

26. 8. 2012

Místo

Kazan

ISBN

978-5-905576-18-8

Kniha

19th European Conference on Fracture

Strany od

188

Strany do

193

Strany počet

6

BibTex

@inproceedings{BUT95956,
  author="Tomáš {Vojtek} and Jaroslav {Pokluda} and Pavel {Šandera} and Jana {Horníková} and Karel {Slámečka} and Reinhard {Pippan} and Anton {Hohenwarter}",
  title="Near-threshold Fatigue Crack Propagation under Mixed-mode II+III in ARMCO Iron",
  booktitle="19th European Conference on Fracture",
  year="2012",
  pages="188--193",
  address="Kazan",
  isbn="978-5-905576-18-8"
}