Modelling of fatigue crack growth following overloads

Voorwald, Herman Jacobus Cornelis; Torres, M.A.S.; Júnior, Caramo Có

doi:10.1016/0142-1123(91)90600-4

Cited by 51 publications

(19 citation statements)

References 17 publications

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“…In order to compare both crack tip plasticity models objectively, a common -factor has to be employed. This factor is dependent on both the applied load and specimen thickness, and a condition for plane strain was introduced [11]. Based on this condition, the thickness of our specimen is well above the required thickness for plane strain, even for the maximum applied load.…”

Section: Analysis Resultsmentioning

confidence: 99%

“…For plane strain the predicted value of 5.07 deviates significantly from Irwin's calculations [10]. As neither plane stress nor plane strain are real-life scenarios, relations have been developed to include the influence of applied load and specimen thickness [11]. Willenborg [2] originally used Irwin's pane stress result while Wheeler [1] employed a plane strain value of 2√2 ≈ 2.8, also deduced from Irwin's work.…”

Section: Plastic Zonementioning

confidence: 99%

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Cycle-by-cycle simulation of variable amplitude fatigue crack propagation

Muys¹,

Zhang²,

Micone³

et al. 2017

SCAD

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Abstract:In variable amplitude fatigue of high strength low alloy (HSLA) steel components, overloads can severely retard subsequent crack propagation for a number of cycles. In order to be able to predict fatigue crack propagation with a reduced degree of conservatism, retardation has to be taken into account. Of all numerical models that have been developed over time, crack tip plasticity models are selected based on the need for a detailed and fast cycle-by-cycle simulation of high cycle. After introducing the load interaction zone concept, common to all crack tip plasticity models, the Wheeler and Willenborg models are discussed, implemented and compared to experimental data. It is concluded that the Modified Wheeler model provides the most promising results, whereas the main limitation of Willenborg models is the need for extensive experimental data. Keywords INTRODUCTIONThe effects of variable amplitude loading on fatigue crack propagation were first observed by the airplane industry. It was found that linear cumulative damage evolution (as predicted with Miner's rule) was often ultraconservative. Experiments revealed that after applying a single overload cycle in between constant amplitude loading cycles, crack propagation was slower than for constant amplitude fatigue [1]. This effect was called retardation. In an attempt to lower the degree of conservatism of a fatigue design -and thus indirectly the safety factor, material usage and cost -researchers tried to account for the retardation effect. Most studies have focused on the behavior of aluminum alloys, which were frequently used in that industry at the time [1][2][3][4][5].Lately, there has been a lot of interest in the offshore industry for simulating variable amplitude fatigue crack propagation [6,7]. Offshore constructions are continuously subjected to variable loading conditions, due to various influences from sea and wind current amongst others. As this problem concerns high cycle fatigue, a first requirement for a suitable cycle-by-cycle fatigue crack propagation model is a reasonable total computation time. Additionally, the model should be able to yield satisfactory results without requiring extensive experimental material characterization. As most models have been developed for aluminum, good correlation for offshore steel grades is not guaranteed.

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Section: Analysis Resultsmentioning

confidence: 99%

Section: Plastic Zonementioning

confidence: 99%

Cycle-by-cycle simulation of variable amplitude fatigue crack propagation

Muys¹,

Zhang²,

Micone³

et al. 2017

SCAD

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“…(7) and Eq. (8),  is the plastic zone size factor which depends on the crack tip shape, maximum stress, yield strength, and specimen thickness 13 . Fig.…”

Section: Scaling Factormentioning

confidence: 99%

Experimental Validation of Crack Growth Prognosis under Variable Amplitude Loads

Leem¹,

An²,

Lim³

et al. 2012

53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference

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In this study, crack growth in a center-cracked plate is predicted under mode I variable amplitude loading, and the result is validated by experiment. Huang's model is employed to describe crack growth with acceleration and retardation due to the variable loading effect. Experiment is conducted with Al6016-T6 plate, in which the load is applied, and crack length is measured periodically. Particle Filter algorithm, which is based on the Bayesian approach, is used to estimate model parameters from the experimental data, and predict the crack growth of the future in the probabilistic way. The prediction is validated by the runto-failure results, from which it is observed that the method predicts well the unique behavior of crack retardation and the more data are used, the closer prediction we get to the actual run-to-failure data.

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“…Under small scale yielding conditions, Voorwald, et al (1991) suggested that the plastic zone size at the crack tips can be expressed by the following equation, ( 2.5( / ) 6 π 1 1 ( / ) π π 2.5 ( / ) 5 1 1 2.5 6 π 6 π π 2.5 π ys ys y y y s Then the calculation for plastic zone size should take into account the real stress state at crack tips.…”

Section: Plastic Zone Under Real Stress Statementioning
confidence: 99%

“…In metals, the load interaction effects are due to variations in crack closure stress Dominguez, et al, 1999;Prawoto, 2009;Voorwald and Torres, 1991;. Taking single overload as an example, it is well known that the fatigue crack growth is retarded after an application of a tensile overload.…”

Section: The Improved Crack Growth Rate Model Under Va Loadingmentioning
confidence: 99%

Towards a Unified Fatigue Life Prediction Method for Marine Structures
Cui
¹
,
Huang
²
,
Wang
³

2014
Advanced Topics in Science and Technology in China
14
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13
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Modelling of fatigue crack growth following overloads

Cited by 51 publications

References 17 publications

Cycle-by-cycle simulation of variable amplitude fatigue crack propagation

Cycle-by-cycle simulation of variable amplitude fatigue crack propagation

Experimental Validation of Crack Growth Prognosis under Variable Amplitude Loads

Towards a Unified Fatigue Life Prediction Method for Marine Structures

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