Numerical analysis of plasticity induced crack closure based on an irreversible cohesive zone model

García-Collado, Alberto; Vasco-Olmo, J.M.; Díaz, Francisco

doi:10.1016/j.tafmec.2017.01.006

Cited by 20 publications

(10 citation statements)

References 34 publications

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“…[41][42][43], in which the material plasticity is explicitly taken into account in the finite element analysis. Re-meshing is then highly cumbersome, with respect to both computational and programming effort, because the plastic strain history needs to be mapped from the old mesh to the new one [6].…”

Section: Representation Of the Crack Advancementmentioning

confidence: 99%

“…In addition, the crack increment Δa has to correspond to the element size, making the crack growth response mesh dependent. By employing micrometre-size elements, this approach is nevertheless widely used [42][43].…”

Section: Representation Of the Crack Advancementmentioning

confidence: 99%

“…The cohesive elements are zero-thickness elements which are placed in between the ordinary elements, and for which a certain forcedisplacement law is specified. When computing fatigue crack propagation with plasticity induced crack closure, the node release technique is the most common to use [45], but cohesive elements are also used by some researchers [42,43,46]. It should be noted that the plastic crack tip field does not contain the 1 r singularity [6], making quarter point elements unnecessary when studying plasticity induced crack closure.…”

Section: Representation Of the Crack Advancementmentioning

confidence: 99%

“…García-Collado, et al [42] illustrate some of the differences between the results obtained by using a physics-based cohesive element technique, and those obtained by using the node release technique, like differences in the plastic strain field around the crack tip. They used an element size of 15 µm at the crack tip, with 13 213 nodes in total to model a compacttension specimen.…”

Section: Current Trendsmentioning

confidence: 99%

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A review of fatigue crack propagation modelling techniques using FEM and XFEM

Rege

Lemu

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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The study of the dissipation heat flow and the acoustic emission during the fatigue crack propagation in the metal A N Vshivkov, A Yu Iziumova, I A Panteleev et al. noAbstract. Fatigue is one of the main causes of failures in mechanical and structural systems. Offshore installations, in particular, are susceptible to fatigue failure due to their exposure to the combination of wind loads, wave loads and currents. In order to assess the safety of the components of these installations, the expected lifetime of the component needs to be estimated. The fatigue life is the sum of the number of loading cycles required for a fatigue crack to initiate, and the number of cycles required for the crack to propagate before sudden fracture occurs. Since analytical determination of the fatigue crack propagation life in real geometries is rarely viable, crack propagation problems are normally solved using some computational method. In this review the use of the finite element method (FEM) and the extended finite element method (XFEM) to model fatigue crack propagation is discussed. The basic techniques are presented, together with some of the recent developments. IntroductionComponents which are subjected to fluctuating loads are found virtually everywhere: Vehicles and other machinery contain rotating axles and gears, pressure vessels and piping may be subjected to pressure fluctuations (e.g. water hammer) or repeated temperature changes, structural members in bridges are subjected to traffic loads and wind loads, while those in ships and offshore structures are subjected to the combination of wind loads, wave loads and currents. If the components are subjected to a fluctuating load of a certain magnitude for a sufficient amount of time, small cracks will nucleate in the material. Over time, the cracks will propagate, up to the point where the remaining cross-section of the component is not able to carry the load, at which the component will be subjected to sudden fracture [1]. This process is called fatigue, and is one of the main causes of failures in structural and mechanical components [2]. In order to assess the safety of the component, engineers need to estimate its expected lifetime. The fatigue life is the sum of the number of loading cycles required for a fatigue crack to nucleate/initiate, and the number of cycles required for the crack to propagate until its critical size has been reached [2,3]. In this paper, computational methods to estimate the lifespan of a propagating crack whose initial geometry is known will be considered.Estimations of the fatigue crack propagation rate, da/dN, are normally based on a relation with the range of the stress intensity factor, ΔK, which is a linear elastic fracture mechanics (LEFM) parameter for quantifying the load and geometry of the crack. Paris, Gomez and Anderson [4] first proposed the existence of such a relation in 1961, and its simplest form is the Paris law [5]:

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Section: Representation Of the Crack Advancementmentioning

confidence: 99%

Section: Representation Of the Crack Advancementmentioning

confidence: 99%

Section: Representation Of the Crack Advancementmentioning

confidence: 99%

Section: Current Trendsmentioning

confidence: 99%

See 2 more Smart Citations

A review of fatigue crack propagation modelling techniques using FEM and XFEM

Rege

Lemu

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Kim and Yoon employed the CFEM to model the high-cycle fretting fatigue of Al alloy [23]. Furthermore, the CFEM was used to analyze the plasticity-induced crack closure of aluminum alloy and numerical analysis was correlated with the fatigue tests [24]. As a common phenomenon, fatigue test data tend to scatter widely due to internal defects, unavoidable wear, and processing errors.…”

Section: Introductionmentioning

confidence: 99%

Local Monte Carlo Method for Fatigue Analysis of Coarse-Grained Metals with a Nanograined Surface Layer

Guo

Sun

Yang

et al. 2018

Metals

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Abstract:The fatigue resistance of coarse-grained (CG) metals can be greatly improved by introducing a nanograined surface layer. In this study, the Weibull distribution is used to characterize the spatially-random fracture properties of specimens under axial fatigue. For the cylindrical solid specimen, the heterogeneity of element sizes may lead to unfavorable size effects in fatigue damage initiation and evolution process. To alleviate the size effects, a three-dimensional cohesive finite element method combined with a local Monte Carlo simulation is proposed to analyze fatigue damage evolution of solid metallic specimens. The numerical results for the fatigue life and end displacement of CG specimens are consistent with the experimental data. It is shown that for the specimens after surface mechanical attrition treatment, damage initiates from the subsurface and then extends to the exterior surface, yielding an improvement in the fatigue life. Good agreement is found between the numerical results for the fatigue life of the specimens with the nanograined layer and experimental data, demonstrating the efficacy and accuracy of the proposed method.

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