A crack propagation criterion based on ΔCTOD measured with 2D‐digital image correlation technique

Ktari, Ahmed; Baccar, Manel; Shah, Masood; Haddar, Nader; Ayedi, H.F.; Rézaï-Aria, Farhad

doi:10.1111/ffe.12153

Cited by 26 publications

(13 citation statements)

References 54 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%

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%

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 calculated ΔJ values are used with the modified equation of Paris law (Eq. (5.5)) obtained from previous work [31] (Fig. 14) to estimate the number of cycles to failure.…”

Section: Modeling and Computation Of Crankshaft Fatigue Lifementioning

confidence: 99%

On the assessment of train crankshafts fatigue life based on LCF tests and 2D-FE evaluation of J-integral

Ktari

Haddar

Rézaï-Aria

et al. 2016

Engineering Failure Analysis

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a b s t r a c tLow cycle fatigue (LCF) tests were carried out on forged carbon steel (AISI 4130) used in V12 Diesel engine crankshafts, at room temperature and 300°C, under total strain control. These tests were performed in order to study the cyclic mechanical behavior, lifetime and damage mechanisms of the material. Then, a Chaboche nonlinear isotropic-kinematic hardening model available in the commercial FE code Abaqus was identified and a 2D-FE evaluation of J-integral, chosen as a crack driven force, has been carried out to estimate the crankshaft life under cyclic bending loads when a macroscopic crack propagates. It has been found that i) material lifetime was not affected by temperature at the studied domain, ii) the fractured surfaces examined with SEM exhibit typical features of ductile fracture behavior, and iii) the number of cycles spent until the total crankshaft fracture is relatively short compared to its total fatigue life.

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“…This model is also applied on the R ratio effects on the FCGR of the material studied. The third model, developed by the authors of this research (Ktari et al, 2014;Shah, 2010), is also used to normalize the FCGR data. This model, however, is based on the crack tip opening displacement (CTOD) parameter and takes into account the material mechanical properties like yield stress, Young's modulus, and strain-hardening exponent.…”

Section: Introductionmentioning

confidence: 99%

“…The crack closure and CTOD are measured using a 2D digital image correlation (DIC) technique as explained in previous studies (Ktari et al, 2014;Shah, 2010). At the end, a discussion about the validity of the different methods of FCGR normalization is presented.…”

Section: Introductionmentioning

confidence: 99%

Normalization of fatigue crack growth data in AISI H11 tool steel at room and elevated temperature

Shah

Mabru

Baccar

et al. 2014

International Journal of Damage Mechanics

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The fatigue crack growth rate of materials is shown to be dependent on the testing conditions like load ratio R and testing temperature. Great interest exists in normalizing this data onto a single curve. In this research, some methods commonly used to normalize the effect of R ratio are tested on Fatigue Crack Growth Rate (FCGR) curves of AISI H11 tool steel. These methods are based on either purely mathematical relations or on the effect of crack closure in variable R ratio tests. A model based on the crack tip opening displacement measurements to normalize the effect of R ratio as well as temperature is also used. This model takes into account the material-hardening coefficient, yield stress, Young's modulus, and the crack tip opening displacement measurements. Crack tip opening displacement measurements have also been directly used to characterize the FCGR. A method is presented to find out crack closure as well as crack tip opening displacement using 2D digital image correlation measurements near the crack tip. At the end, a critical analysis of the four normalization techniques is presented.

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A crack propagation criterion based on ΔCTOD measured with 2D‐digital image correlation technique

Cited by 26 publications

References 54 publications

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

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

On the assessment of train crankshafts fatigue life based on LCF tests and 2D-FE evaluation of J-integral

Normalization of fatigue crack growth data in AISI H11 tool steel at room and elevated temperature

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