Finite element analysis of crack-tip opening displacement and plastic zones considering the cyclic material behaviour

Tinoco, Héctor A.; Cardona, Carlos I.; Vojtek, Tomáš; Hutař, Pavel

doi:10.1016/j.prostr.2020.01.140

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…Due to cyclic loading, the material ahead of a crack tip experiences complexes states of deformation involving both tension and compression stresses, which are induced by the loading and unloading phases, respectively. 51 The material hardening (or softening, depending on the dislocation substructures 52 ) under cyclic loading is supposed to be steady after a certain number of cycles. 53 Consequentially, there is a stabilization of the yield surface, which can be modeled by adding an isotropic component to the flow stress.…”

Section: Materials Constitutive Modelmentioning

confidence: 99%

“…

\overset{σ}{true} = \sqrt{\frac{3}{2} σ^{'} : σ^{'}},

where

σ^{'}

is the deviatoric stress tensor. Due to cyclic loading, the material ahead of a crack tip experiences complexes states of deformation involving both tension and compression stresses, which are induced by the loading and unloading phases, respectively 51 . The material hardening (or softening, depending on the dislocation substructures 52 ) under cyclic loading is supposed to be steady after a certain number of cycles 53 .…”

Section: Numerical Modelmentioning

confidence: 99%

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Fatigue crack growth modeling considering a hybrid propagation strategy

Sérgio

Antunes

Neto

2023

Fatigue Fract Eng Mat Struct

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Fatigue results from the occurrence of several damage mechanisms and their interactions. The cyclic plastic strain and damage accumulation at the crack tip are widely pointed as the main agents behind fatigue crack growth (FCG). In this work, the authors propose the prediction of FCG through a node release numerical model that offers several possibilities regarding the modeling of the mechanisms behind fatigue. A hybrid propagation method is presented where both cumulative plastic strain and porous damage represent parallel propagation criteria. Accordingly, the node is released once either a critical plastic strain or a critical porosity, at the crack tip, is reached. The Gurson–Tvergaard–Needleman (GTN) damage model is employed to predict porous damage evolution through the processes of nucleation and growth of micro‐voids. The model is validated through comparison with experimental data for the AA2024‐T351 aluminum alloy. Finally, the interactions between plastic strain, porous damage, crack closure, and stress triaxiality are accessed.

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Section: Materials Constitutive Modelmentioning

confidence: 99%

“…

\overset{σ}{true} = \sqrt{\frac{3}{2} σ^{'} : σ^{'}},

where

σ^{'}

Section: Numerical Modelmentioning

confidence: 99%

Fatigue crack growth modeling considering a hybrid propagation strategy

Sérgio

Antunes

Neto

2023

Fatigue Fract Eng Mat Struct

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ProCrackPlast: a finite element tool to simulate 3D fatigue crack growth under large plastic deformations

Ganesh,

Dude,

Kuna

et al. 2023

Int J Fract

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Many structural components and devices in combustion and automotive engineering undergo highly intensive cyclic thermal and mechanical loading during their operation, which leads to low cycle (LCF) or thermomechanical (TMF) fatigue crack growth. This behavior is often characterized by large scale plastic deformations and creep around the crack, so that concepts of linear-elastic fracture mechanics fail. The finite element software ProCrackPlast has been developed at TU Bergakademie Freiberg for the automated simulation of fatigue crack growth in arbitrarily loaded three-dimensional components with large scale plastic deformations, in particular under cyclic thermomechanical loading. ProCrackPlast consists of a bundle of Python routines, which manage finite element pre-processing, crack analysis, and post-processing in combination with the commercial software Abaqus . ProCrackPlast is based on a crack growth procedure which adaptively updates the crack size in finite increments. Crack growth is controlled by the cyclic crack tip opening displacement $$\varDelta $$ Δ CTOD, which is considered as the appropriate fracture-mechanical parameter in case of large scale yielding. The three-dimensional $$\varDelta $$ Δ CTOD concept and its effective numerical calculation by means of special crack-tip elements are introduced at first. Next, the program structure, the underlying numerical algorithms and calculation schemes of ProCrackPlast are outlined in detail, which capture the plastic deformation history along with the moving crack. In all simulations, a viscoplastic cyclic material law is used within a large strain setting. The numerical performance of this software is studied for a single edge notch tension (SENT) specimen under isothermal cyclic loading and compared to common finite element techniques for fatigue crack simulation. The capability of this software is featured in two application examples showing crack growth under mixed-mode LCF and TMF in a typical austenite cast steel, Ni-Resist. In combination with a crack growth law identified in terms of $$\varDelta $$ Δ CTOD for a specific material, the tool ProCrackPlast is able to predict the crack evolution in a 3D component for a given thermomechanical loading scenario.

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