Publication detail

Verification of Linear Dependence of Plastic Zone Size on J-integral for Mixed-mode Loading

ŽÁK, S. HORNÍKOVÁ, J. ŠANDERA, P. POKLUDA, J.

Original Title

Verification of Linear Dependence of Plastic Zone Size on J-integral for Mixed-mode Loading

Czech Title

Ověření lineární závislosti velikosti plastické zóny na hodnotě J-integrálu pro smíšené zatěžování

English Title

Verification of Linear Dependence of Plastic Zone Size on J-integral for Mixed-mode Loading

Type

journal article

Language

en

Original Abstract

Determination of fatigue crack growth characteristics under shear-mode loading is a rather complicated problem. To increase an efficiency and precision of such testing, special specimens enabling simultaneous propagation of shear cracks under II, III and II+III loading modes started to be used rather recently. However, a description of crack growth rate in terms of appropriate fracture mechanics quantities demands a precise assessment of plastic zone size under various shear-mode loading levels. This contribution is focused on the numerical elasto-plastic analysis of stress-strain field at the crack tip in specimens made of a pure polycrystalline (ARMCO) iron loaded by mixed mode II+III. The dependence of plastic zone size on the J-integral value described the wide region of loading. The results reveal that formixed mode II+III the small scale yielding conditions are fulfilled in the region where plastic zone size is smaller than 1/10 of the total crack length.

Czech abstract

Stanovení únavových charakteristik růstu trhliny pro smykové zatížení je poměrně složitý problém. Pro zvýšení účinnost a přesnosti těchto testů se začaly poměrně nedávno používat speciální vzorky umožňující simultánní šíření smykových trhlin v módech II, III a II+III. Nicméně, popis rychlosti růstu trhliny pomocí příslušných parametrů lomové mechaniky vyžaduje přesné zhodnocení velikosti plastické zóny pro různé úrovně smykového zatížení. Tento příspěvek je zaměřen na numerickou elastoplastickou analýzu pole napětí-deformace v oblasti trhliny ve vzorcích vyrobených z čistého polykrystalické (Armco) železa zatíženého v kombinovaném režimu II + III. Závislost velikosti plastické zóny na hodnotě J-integrálu popisuje rozsáhlý soubor úrovní zatížení. Výsledky ukazují, že pro smíšený mód II+III jsou splněny podmínky malého zatěžování v oblasti, kde velikost plast zóny je menší než desetina celkové délky trhliny.

English abstract

Determination of fatigue crack growth characteristics under shear-mode loading is a rather complicated problem. To increase an efficiency and precision of such testing, special specimens enabling simultaneous propagation of shear cracks under II, III and II+III loading modes started to be used rather recently. However, a description of crack growth rate in terms of appropriate fracture mechanics quantities demands a precise assessment of plastic zone size under various shear-mode loading levels. This contribution is focused on the numerical elasto-plastic analysis of stress-strain field at the crack tip in specimens made of a pure polycrystalline (ARMCO) iron loaded by mixed mode II+III. The dependence of plastic zone size on the J-integral value described the wide region of loading. The results reveal that formixed mode II+III the small scale yielding conditions are fulfilled in the region where plastic zone size is smaller than 1/10 of the total crack length.

Keywords

Crack Growth, J- Integral, Mixed Mode Loading, Plastic Zone Size, Shear-Mode Cracks

RIV year

2015

Released

01.04.2015

Pages from

15

Pages to

20

Pages count

6

BibTex 


@article{BUT114709,
  author="Stanislav {Žák} and Jana {Horníková} and Pavel {Šandera} and Jaroslav {Pokluda}",
  title="Verification of Linear Dependence of Plastic Zone Size on J-integral for Mixed-mode Loading",
  annote="Determination of fatigue crack growth characteristics under shear-mode loading is a rather complicated problem. To increase an efficiency and precision of such testing, special specimens enabling simultaneous propagation of shear cracks under II, III and II+III loading modes started to be used rather recently. However, a description of crack growth rate in terms of appropriate fracture mechanics quantities demands a precise assessment of plastic zone size under various shear-mode loading levels. This contribution is focused on the numerical elasto-plastic analysis of stress-strain field at the crack tip in specimens made of a pure polycrystalline (ARMCO) iron loaded by mixed mode II+III. The dependence of plastic zone size on the J-integral value described the wide region of loading. The results reveal that formixed mode II+III the small scale yielding conditions are fulfilled in the region where plastic zone size is smaller than 1/10 of the total crack length.",
  chapter="114709",
  doi="10.4028/www.scientific.net/AMM.751.15",
  howpublished="print",
  number="1",
  volume="751",
  year="2015",
  month="april",
  pages="15--20",
  type="journal article"
}