A numerical analysis of CTOD in constant amplitude fatigue crack growth

Antunes, F.V.; Rodrigues, S.M.; Branco, R.; Camas, D.

doi:10.1016/j.tafmec.2016.08.015

Cited by 52 publications

(36 citation statements)

References 67 publications

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“…The linear trend between crack growth and CTOD was also observed by Tvergaard, Pippan and Grosinger and Guo et al However, all those authors used the total CTOD instead of the plastic CTOD. The independence of da/dN versus CTOD relations relatively to stress ratio was also observed by Shahani et al and Ktari et al and Guo et al Results obtained previously for the 6082‐T6 aluminium alloy are also presented in Fig. .…”

Section: Numerical Determination Of Plastic Ctodsupporting

confidence: 83%

“…The impact of stress state on plastic CTOD is another interesting issue. In a previous work, no influence of stress state was found in the absence of crack closure, which indicates that the effect of stress state is only linked to crack closure phenomenon.…”

Section: Discussionmentioning

confidence: 60%

“…The capabilities of CTOD to study crack closure and FCG were fully demonstrated in a previous work of the authors. 49 An intimate relation was also found between the plastic CTOD and other crack tip parameters, namely the plastic strain range and the energy dissipated ahead of crack tip.…”

Section: N O M E N C L a T U R Ementioning

confidence: 86%

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Fatigue crack growth modelling based on CTOD for the 7050‐T6 alloy

Antunes

Branco

Prates

et al. 2017

Fatigue Fract Eng Mat Struct

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The plastic crack tip opening displacement (CTODp) is considered to replace ΔK in the study of fatigue crack propagation. The cyclic plastic deformation of the 7050‐T6 aluminium alloy was determined experimentally and modeled analytically. Then, a three‐dimensional elastic–plastic numerical model which included crack growth was developed in order to predict the plastic CTOD for different loading conditions. In a parallel study, crack growth rates were determined experimentally in M(T) specimens with a thickness of 6 mm. A relation was subsequently established between da/dN and plastic CTOD for the 7050‐T6 aluminium alloy, independent of stress ratio, showing that the CTOD is a viable alternative to ΔK in the analysis of fatigue crack propagation.

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Section: Numerical Determination Of Plastic Ctodsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 60%

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Fatigue crack growth modelling based on CTOD for the 7050‐T6 alloy

Antunes

Branco

Prates

et al. 2017

Fatigue Fract Eng Mat Struct

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“…The rate of variation of CTOD p increases progressively with load. In previous works, the plastic CTOD range, δ p , was correlated with fatigue crack growth rate, assuming that FCG is controlled by crack tip plastic deformation and that δ p is able to quantify this deformation.…”

Section: Numerical Determination Of Plastic Ctod δPmentioning

confidence: 99%

“…This explains the inability of d a /d N ‐Δ K models to predict the effect of stress ratio or variable amplitude loading. Therefore, in previous works of the authors, a parameter was used to characterize crack tip deformation which was the plastic portion of crack tip opening displacement (CTOD). Assuming that fatigue crack growth is linked to crack tip cyclic plastic deformation, a model d a /d N ‐ δ p was proposed, where δ p is the range of plastic CTOD.…”

Section: Introductionmentioning

confidence: 99%

Numerical determination of plastic CTOD

Antunes

Díaz

Vasco-Olmo

et al. 2018

Fatigue Fract Eng Mat Struct

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In previous works, a da/dN versus plastic crack tip opening displacement model was proposed to study fatigue crack growth. The plastic crack tip opening displacement, δp, which quantifies the crack tip plastic deformation, is determined numerically using the finite element method. The predictions are affected by different numerical parameters which must be identified and studied. The main parameters are the crack propagation distance, the distance of measurement points relatively to the crack tip, the size of crack tip elements, and the number of load cycles between crack increments. Some crack propagation is required for the stabilization of δp, which occurs when δp reaches its minimum value. The measurement point behind crack tip has a major effect on δp. The peak value occurs at the first node behind crack tip and a progressive decrease of sensitivity is observed with the increase of distance to crack tip. A mesh refinement study showed a coincidence of the predictions obtained with different meshes, which is a good indication for the robustness of the procedure. Finally, there is a significant effect of the number of load cycles between crack increments, NLC, in the presence of crack closure. The increase of NLC reduces the crack opening level and so increases δp.

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