A general model of fatigue crack growth under variable amplitude loading

Liu, JianTao; Du, Pengfei; Zhang, Zhenyu

doi:10.1007/s11431-011-4656-x

Cited by 10 publications

(2 citation statements)

References 20 publications

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“…These predictions are slightly conservative and follows the same trend as the experiment data. Similarly, a-da/dN curves are used for further model validation [19], as shown in Fig 15. It is clear that the prediction of the Willenborg model (dashed line) returns back much earlier than the testing data. Therefore, the modified Willenborg method based on the SEM fatigue testing observations can capture the major trends of fatigue life curves under CA loading with overloads.…”

Section: Crack Growth Prediction In 350wt Under Constant Loading Withmentioning

confidence: 99%

Investigation of fatigue crack growth under loading sequence effects using in-situ SEM testing

et al. 2018

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Abstract. Fatigue damage is one of the most important failure mechanisms in engineering components. The excited structures are usually subjected to spike loads in the fatigue weakness area during their service lives. The nonlinear loading sequence effects due to overloads are significant in the crack propagation process. In this paper, an in-situ scanning electron microscope (SEM) testing is performed to analyse the mechanisms of nonlinear fatigue crack growth affected by the load sequence. The crack tip behaviours under constant amplitude loading cycles superimposed by tensile overload were observed. The SEM experiment results reveal that the overload effects include the transient weakened area (shear bands and micro-cracks) and the relatively long-term retardation. Additionally, the observation loading sequence influence region is larger than the theoretical value. According to these SEM testing analyses, the Willenborg is modified considering the nonlinear loading sequence effects. In this approach, the damage zone concept is introduced to account for the instantaneous acceleration. Moreover, the loading sequence effect area is defined as the whole plastic zone due to overload rather than part of it. The proposed algorithm is validated by experiment data of 350WT steel and Al 2024-T351 specimens under constant loading with overloads. Good agreements are observed.

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Section: Crack Growth Prediction In 350wt Under Constant Loading Withmentioning

confidence: 99%

Investigation of fatigue crack growth under loading sequence effects using in-situ SEM testing

et al. 2018

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“…So far, rules of FCG rates under VA loading have been investigated extensively and many models [1][2][3][4] have been proposed. To describe the integrative effect of specimen thickness, stress ratio, and material property on FCG rates explicitly and define the boundary of the retardation effect due to overloads quantitatively, a general model [4] is adopted to predict the FCG rates for numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Computational Procedure of Fatigue Crack Growth under Variable Amplitude Loading via XFEM

Liu

2012

AMR

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Modeling of fatigue crack growth (FCG) under variable amplitude (VA) loading has been a topic of intensive research for decades. This paper proposed an efficient numerical simulation procedure of the FCG process under VA loading via extended finite element method (XFEM). The procedure can describe the integrative effect of several factors (specimen thickness, stress ratio, Poisson’s ratio and so on) simultaneously with a general model. In order to improve the computation efficiency, the whole continua domain is divided into two parts by the level set functions and the global stiffness matrix is divided into four parts accordingly. Then, the inverse operation of global stiffness matrix can be calculated rapidly with the LDU decomposition and the equilibrium equation can be solved effectively. Several sets of fatigue test data in 2024-T351 and 7075-T6 aluminum alloys are used to verify the procedure, the predictions are in good agreement with the test data.

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Crack location identification of rotating rotor systems using operating deflection shape data

Zhang

Yang

et al. 2013

Sci. China Technol. Sci.

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A general model of fatigue crack growth under variable amplitude loading

Cited by 10 publications

References 20 publications

Investigation of fatigue crack growth under loading sequence effects using in-situ SEM testing

Investigation of fatigue crack growth under loading sequence effects using in-situ SEM testing

An Efficient Computational Procedure of Fatigue Crack Growth under Variable Amplitude Loading via XFEM

Crack location identification of rotating rotor systems using operating deflection shape data

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