Fatigue crack growth behavior of fine-grained steel S460N under proportional and non-proportional loading

Zerres, Patrick; Brüning, Jutta; Vormwald, Michael

doi:10.1016/j.engfracmech.2010.02.008

Cited by 32 publications

(14 citation statements)

References 7 publications

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“…The type of loading has a significant influence on both the fatigue life and the crack path, as shown e. g. in [23,24], where the fatigue crack growth behavior in a fine grained steel S460N under predominant mode I and II loading was investigated. Neither simulations based on linear-elastic fracture mechanics, nor simulations based on elastic-plastic fracture mechanics, using a nodal-release algorithm, are suited for this type of loading.…”

Section: Discussionmentioning

confidence: 99%

Simulation of fatigue crack growth under consideration of cyclic plasticity

Zerres¹,

Döring

Vormwald

2011

Materialwissenschaft Werkst

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In this paper a procedure to simulate the crack growth under consideration of elastic‐plastic material behavior by means of the finite element method is described. Within this procedure, after each increment of crack advance, the structure is remeshed and the status variables, such as the components of the backstress‐tensor and the plastic strains, are transferred from the old mesh to the new one. Due to mapping of the variables, improper conditions are possibly prevailing at the beginning of the new analysis, which has to be captured by the used material routine. The main focus of this paper is to describe these necessary numerical adjustments.

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Section: Discussionmentioning

confidence: 99%

Simulation of fatigue crack growth under consideration of cyclic plasticity

Zerres¹,

Döring

Vormwald

2011

Materialwissenschaft Werkst

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“…Based on the experimental observations of Brüning, 58 Zerres et al, 59,60 and Sonsino, 61 slightly longer fatigue crack growth lives were stated for nonproportional loading (with a phase shift of 45°and 90°, respectively) compared with proportional loading. Zerres and Vormwald 51 also stated a transition from tensile to shear dominated crack growth and related this to the mild notch effect of the thin-walled specimens used by Brüning; see Figure 10.…”

Section: Two Cyclic Load Components With a Phase Shift To Each Othermentioning

confidence: 95%

Fatigue of engineering structures under combined nonproportional loads: An overview

Vormwald

Hertel

Zerres

2018

Fatigue Fract Eng Mat Struct

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Nonproportionality in fatigue is a matter of loading sequences acting on structures. In such loading cases, a life assessment‐based search of the initiation site is required. This means that for a variety of potential sites, their stress‐strain sequences must be determined and the corresponding fatigue lives have to be calculated. For the determination of local stress‐strain sequences, a superposition of the action of loads at all times for all potential sites must be performed. The superposition has not only to be performed at a particular time of a load reversal but also for a sufficiently large number of intermediate points in time. For the assessment of crack initiation under local nonproportional stress‐strain sequences, a multiaxial fatigue damage hypothesis must be specified. Due to the superiority with respect to accuracy, critical plane approaches are the favourite ones when dealing with nonproportional fatigue of ductile metals. For describing fatigue crack growth, the time sequences for the stress intensity factors corresponding to the 3 opening modes must be obtained by superposition. A mixed‐mode hypothesis must be applied to predict both the direction and the increment of crack growth at each crack front point. A first prediction trial should be based on an appropriate extension of the maximum tangential stress hypothesis. An application of a variant of the maximum shear stress hypothesis might be an amendment. Especially in the case of crack turning, the consideration of crack face contact is mandatory.

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“…In order to capture crack closure effects in the FEmodel ( [18], [19], [20]), 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: Crack Closure Modellingmentioning

confidence: 99%

Fatigue of welded joints described by elastic‐plastic fracture mechanics

2018

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The fatigue life of welded joints is calculated using the effective cyclic J-integral as crack driving force. The plasticity induced crack closure effect is taken into consideration. Here, the fatigue life is regarded as period of short fatigue crack growth. Two and three dimensional finite element models, with cracks as initial defects, are constructed for this purpose. The finite element based crack growth analyses were performed by using the node release technique in combination with the finite element program AB-AQUS. For fatigue life calculations, the effective cyclic J-integral was employed in a relation similar to the Paris (crack growth) equation. For this purpose, a Python code was written for the determination of the crack driving force for various relevant crack lengths. The calculated fatigue lives were compared with experimental data and a good accordance between both results was achieved. Schwingfestigkeit von Schweißverbindungen beschrieben mitHilfe der elastisch-plastischen Bruchmechanik. Die Schwingfestigkeit von Schweißverbindungen wird unter Verwendung des effektiven zyklischen J-Integrals als risstreibende Kraft berechnet. Plastizitätsinduzierte Rissschließeffekte werden dabei berücksichtigt. Hierzu werden ebene und räumliche, mit rissartigen Imperfektionen versehene, Finite-Elemente-Modelle erstellt. Die Simulation des Ermüdungsrisswachstums erfolgt unter Anwendung des Node-Release-Verfahrens mit dem kommerziellen FE-Programm ABAQUS. Zur Berechnung der Lebensdauer wurde das effektive zyklische J-Integral in eine Relation ähnlich der Rissfortschrittsgleichung nach Paris eingesetzt. Zu diesem Zweck wurde ein Algorithmus geschrieben, um die risstreibende Kraft für verschiedene lebensdauerrelevante Risslängen zu bestimmen. Die damit berechneten Lebensdauern für technischen Anriss wurden mit experimentellen Daten verglichen: Berechnete und experimentell bestimmte Lebensdauern stimmten gut überein.

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Fatigue crack growth behavior of fine-grained steel S460N under proportional and non-proportional loading

Cited by 32 publications

References 7 publications

Simulation of fatigue crack growth under consideration of cyclic plasticity

Simulation of fatigue crack growth under consideration of cyclic plasticity

Fatigue of engineering structures under combined nonproportional loads: An overview

Fatigue of welded joints described by elastic‐plastic fracture mechanics

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