Numerical simulation of plasticity-induced fatigue crack closure with emphasis on the crack growth scheme: 2D and 3D analyses

Matos, P.F.P. de; Nowell, D.

doi:10.1016/j.engfracmech.2007.10.017

Cited by 96 publications

(31 citation statements)

References 36 publications

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“…The opening values are low at the beginning and gradually increase, rising quickly at first and then more slowly as a stable value is reached. This is a well-known trend found by different authors [22,25,29,33,34]. The crack propagation required for stabilization, Da stab , is however dependent on load parameters.…”

Section: Horizontal Size Of Refined Mesh X Rmentioning

confidence: 75%

“…7. The peak was observed for plane strain state by different authors [25,33,36,51,52], while others found a stable and fast increase without initial peak [22,23,53]. Lugo et al [38] showed that the peak is not only linked to the load level, but also to the T-stress.…”

Section: Horizontal Size Of Refined Mesh X Rmentioning

confidence: 91%

“…In 3D models the numerical effort is a major concern and all efforts are required to keep it within acceptable levels. Chermahini et al [24] considered only 4 elements along the thickness, while Matos and Nowell [25] considered 8 elements. Camas [23] considered 30, 60 and 100 elements in CT specimens with 3, 6 and 12 mm of thickness, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Finite element meshes for optimal modelling of plasticity induced crack closure

Antunes

Camas

Correia

et al. 2015

Engineering Fracture Mechanics

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The main goal here is to optimise the finite element mesh used to predict plasticity inducedcrack closure (PICC). A numerical model was developed for a M(T) specimen made of6016-T4 aluminium alloy. The parameters studied were the size of most refined region perpendicularly to crack flank (ym) and along propagation direction (xr), the size of finite elements near crack tip (L1) and the vertical size of refinement close to crack flank (yA/B). A maximum size of about 1.3 mm was found for ym, but a smaller value has a limited impact on PICC. An analytical expression was proposed for xr, dependent on DK and Kmax. An optimumvalue seems to exist for L1.

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Section: Horizontal Size Of Refined Mesh X Rmentioning

confidence: 75%

Section: Horizontal Size Of Refined Mesh X Rmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Finite element meshes for optimal modelling of plasticity induced crack closure

Antunes

Camas

Correia

et al. 2015

Engineering Fracture Mechanics

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“…The specimen was loaded with a cyclic nominal stress S in the direction perpendicular to crack faces (xdirection). Closure effects were not considered and the node release technique [12,19] was used for the gradual extension of the crack. The ratio a/c = 1 was kept constant during node release.…”

Section: Path-independency Of the Cyclic J-integralmentioning

confidence: 99%

“…In order to capture crack closure effects [12,18,19] in the FE-model, contact boundary conditions have to be defined between crack faces. The contact opening displacements of all the crack face nodes were monitored during the cyclic loading for the determination of the crack closure time, t cl .…”

Section: Effective Cyclic J-integralmentioning

confidence: 99%

Short fatigue crack growth in welded joints described by the effective cyclic J-integral

Ngoula

Vormwald

2018

MATEC Web Conf.

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Abstract. The purpose of the present contribution is to predict the fatigue life of welded joints by using the effective cyclic J-integral as crack driving force. The plasticity induced crack closure effects and the effects of welding residual stresses are taken into consideration. Here, the fatigue life is regarded as period of short fatigue crack growth. The node release technique is used to perform finite element based crack growth analyses. For fatigue lives calculations, the effective cyclic J-integral is employed in a relation similar to the Paris (crack growth) equation. For this purpose, a specific code was written for the determination of the effective cyclic J-integral for various lifetime relevant crack lengths. The effects of welding residual stresses on the crack driving force and the calculated fatigue lives are investigated. Results reveal that the influence of residual stresses can be neglected only for large load amplitudes. Finally, the predicted fatigue lives are compared with experimental data: a good accordance between both results is achieved.

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Modellierung des Ermüdungsrisswachstums in Schweißverbindungen unter Berücksichtigung von Schweißeigenspannungen

Ngoula

Beier

Vormwald

2016

Materialwissenschaft Werkst

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Forschungsergebnisse, die am Fachgebiet Werkstoffmechanik der Technischen Universität Darmstadt innerhalb des DFG‐AiF‐Forschungsclusters IBESS (Integrale Bruchmechanische Ermittlung der Schwingfestigkeit von Schweißverbindungen) erzielt wurden, werden im Rahmen dieses Beitrags präsentiert [1]. Ziel ist es, die Lebensdauer für den technischen Anriss in Schweißverbindungen unter Berücksichtigung von Schweißeigenspannungen und der Nahtgeometrieparametern zu berechnen. Hierzu werden räumliche, mit rissartigen Imperfektionen versehene Finite Elemente (FE) Modelle erstellt. Die Simulation des Ermüdungsrisswachstums erfolgt unter Anwendung des Node‐Release‐Verfahrens mit dem kommerziellen Finite Elemente‐Programm ABAQUS. Die Schweißeigenspannungen sowie die plastizitätsinduzierten Rissschließeffekte werden berücksichtigt. Um die aus dem Schweißprozess resultierenden Eigenspannungsfelder im Finite Elemente‐Modell abbilden zu können, wurden Strukturberechnungen mit adäquaten thermischen Randbedingungen durchgeführt. Die gemessenen Schweißeigenspannungsprofile konnten damit gut angenähert werden. Als Rissspitzenbeanspruchungsparameter wird das effektive zyklische J‐Integral (ΔJeff) in einer Rissforschrittsgleichung in Verbindung mit einem Potenzgesetz verwendet. Zu diesem Zweck wurde ein Python‐Code geschrieben, um ΔJeff für jede Risslängenkonfiguration zu bestimmen. Die mit ΔJeff berechneten Anrisslebensdauern wurden mit experimentellen Daten verglichen: berechnete und experimentell bestimmte Lebensdauern stimmten gut überein. Der Einfluss von Schweißeigenspannungen auf ΔJeff als auch auf die Anrisslebensdauer wurde numerisch untersucht: Wie erwartet wirken sich Druckeigenspannungen bei niedriger Spannungsamplitude günstig auf die Lebensdauer aus und Zugeigenspannungen führen dagegen zu kürzeren Lebensdauer. Bei höheren Lastamplituden spielen Eigenspannungen praktisch keine Rolle mehr.

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Numerical simulation of plasticity-induced fatigue crack closure with emphasis on the crack growth scheme: 2D and 3D analyses

Cited by 96 publications

References 36 publications

Finite element meshes for optimal modelling of plasticity induced crack closure

Finite element meshes for optimal modelling of plasticity induced crack closure

Short fatigue crack growth in welded joints described by the effective cyclic J-integral

Modellierung des Ermüdungsrisswachstums in Schweißverbindungen unter Berücksichtigung von Schweißeigenspannungen

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