2D finite element simulation of mixed mode fatigue crack propagation for CTS specimen

Alshoaibi, Abdulnaser M.; Fageehi, Yahya Ali

doi:10.1016/j.jmrt.2020.04.083

Cited by 33 publications

(28 citation statements)

References 23 publications

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“…In the modified equation of the Paris law, Tanaka [20] derived an innovative law known as the power law for determining crack growth in response to fatigue with the equivalent stress intensity factor (∆K eq ) as…”

Section: K Positivementioning

confidence: 99%

“…In order to simulate 2D cracks under mixed mode loading, the current developed software code is formulated to allow the researcher to estimate the fatigue life and crack trajectory using the automated adaptive mesh finite element [11][12][13][14][15]. This software was created in 2004 and continues to include several features for the simulation of two-dimensional fatigue crack growth under LEFM assumptions [12,[16][17][18][19][20][21]. The use of commercial software for engineers is not appropriate in at least two aspects: First, the basic algorithm that lies behind it is not fully understood, and second, the execution is completely apprehended throughout the programming ability.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Quasi-Static Crack Propagation by Adaptive Finite Element Method

Alshoaibi

Fageehi

2021

Metals

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The finite element method (FEM) is a widely used technique in research, including but not restricted to the growth of cracks in engineering applications. However, failure to use fine meshes poses problems in modeling the singular stress field around the crack tip in the singular element region. This work aims at using the original source code program by Visual FORTRAN language to predict the crack propagation and fatigue lifetime using the adaptive dens mesh finite element method. This developed program involves the adaptive mesh generator according to the advancing front method as well as both the pre-processing and post-processing for the crack growth simulation under linear elastic fracture mechanics theory. The stress state at a crack tip is characterized by the stress intensity factor associated with the rate of crack growth. The quarter-point singular elements are constructed around the crack tip to accurately represent the singularity of this region. Under linear elastic fracture mechanics (LEFM) with an assumption in various configurations, the Paris law model was employed to evaluate mixed-mode fatigue life for two specimens under constant amplitude loading. The framework includes a progressive analysis of the stress intensity factors (SIFs), the direction of crack growth, and the estimation of fatigue life. The results of the analysis are consistent with other experimental and numerical studies in the literature for the prediction of the fatigue crack growth trajectories as well as the calculation of stress intensity factors.

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Section: K Positivementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation of Quasi-Static Crack Propagation by Adaptive Finite Element Method

Alshoaibi

Fageehi

2021

Metals

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“…Various DK eq models have been proposed to investigate the fatigue crack propagation in a I-II mixed model [40][41][42][43][44]. Previous studies have shown that these DK eq models give similar prediction results [45,46]. Here, Richard's model [42,43] was employed, which can be expressed as follows:…”

Section: Fretting Fatigue Crack Propagationmentioning

confidence: 99%

Experimental and numerical study on fretting wear and fatigue of full-scale railway axles

Zou

Zeng

et al. 2020

Rail. Eng. Science

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This study investigated the fretting wear and fatigue of full-scale railway axles. Fatigue tests were conducted on full-scale railway axles, and the fretting wear and fretting fatigue in the fretted zone of the railway axles were analysed. Three-dimensional finite element models were established based on the experimental results. Then, multi-axial fatigue parameters and a linear elastic fracture mechanics-based approach were used to investigate the fretting fatigue crack initiation and propagation, respectively, in which the role of the fretting wear was taken into account. The experimental and simulated results showed that the fretted zone could be divided into zones I–III according to the surface damage morphologies. Fretting wear alleviated the stress concentration near the wheel seat edge and resulted in a new stress concentration near the worn/unworn boundary in zone II, which greatly promoted the fretting crack initiation at the inner side of the fretted zone. Meanwhile, the stress concentration also increased the equivalent stress intensity factor range ΔKeq below the mating surface, and thus promoted the propagation of fretting fatigue crack. Based on these findings, the effect of the stress redistribution resulting from fretting wear is suggested to be taken into account when evaluating the fretting fatigue in railway axles.

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“…Therefore, cracks can grow in the skin of aircraft fuselages and may subject to mixed-mode type of loading. Generally, crack initiation and propagation must be associated with the governing stress intensity factors (SIFs) in a complicated state [ 4 , 5 , 6 , 7 ]. Fatigue crack analysis is essential in different fields of engineering since fatigue cracks are one among the main sources of catastrophic fracture failures.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Fatigue Crack Growth Path and Life Predictions for Linear Elastic Material

Alshoaibi

Fageehi

2020

Materials

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The main objective of this work was to present a numerical modelling of crack growth path in linear elastic materials under mixed-mode loadings, as well as to study the effect of presence of a hole on fatigue crack propagation and fatigue life in a modified compact tension specimen under constant amplitude loading condition. The ANSYS Mechanical APDL 19.2 is implemented for accurate prediction of the crack propagation paths and the associated fatigue life under constant amplitude loading conditions using a new feature in ANSYS which is the smart crack growth technique. The Paris law model has been employed for the evaluation of the mixed-mode fatigue life for the modified compact tension specimen (MCTS) with different configuration of MCTS under the linear elastic fracture mechanics (LEFM) assumption. The approach involves accurate evaluation of stress intensity factors (SIFs), path of crack growth and a fatigue life evaluation through an incremental crack extension analysis. Fatigue crack growth results indicate that the fatigue crack has always been attracted to the hole, so either it can only curve its path and propagate towards the hole, or it can only float from the hole and grow further once the hole has been lost. In terms of trajectories of crack propagation under mixed-mode load conditions, the results of this study are validated with several crack propagation experiments published in literature showing the similar observations. Accurate results of the predicted fatigue life were achieved compared to the two-dimensional data performed by other researchers.

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2D finite element simulation of mixed mode fatigue crack propagation for CTS specimen

Cited by 33 publications

References 23 publications

Simulation of Quasi-Static Crack Propagation by Adaptive Finite Element Method

Simulation of Quasi-Static Crack Propagation by Adaptive Finite Element Method

Experimental and numerical study on fretting wear and fatigue of full-scale railway axles

Numerical Analysis of Fatigue Crack Growth Path and Life Predictions for Linear Elastic Material

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