Good Practice for Fatigue Crack Growth Curves Description

Kłysz, Sylwester; Leski, Andrzej

doi:10.5772/52794

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…The crack propagation description is one of the most important components in the analysis of the life span of structural components, but it may require time and expense to investigate experimentally [ 71 ]. Hence, the estimation of crack propagation and durability of construction or structural component will be useful to estimate the remaining life of the component.…”

Section: Application Settingmentioning

confidence: 99%

A RUL Estimation System from Clustered Run-to-Failure Degradation Signals

Cho

Carrasco

Ruz

2022

Sensors

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The prognostics and health management disciplines provide an efficient solution to improve a system’s durability, taking advantage of its lifespan in functionality before a failure appears. Prognostics are performed to estimate the system or subsystem’s remaining useful life (RUL). This estimation can be used as a supply in decision-making within maintenance plans and procedures. This work focuses on prognostics by developing a recurrent neural network and a forecasting method called Prophet to measure the performance quality in RUL estimation. We apply this approach to degradation signals, which do not need to be monotonical. Finally, we test our system using data from new generation telescopes in real-world applications.

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Section: Application Settingmentioning

confidence: 99%

A RUL Estimation System from Clustered Run-to-Failure Degradation Signals

Cho

Carrasco

Ruz

2022

Sensors

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“…Some applications however, might require that a certain amount of crack growth is allowed, to make them cost efficient. In this case a Paris law curve is often used to define the crack growth rate as a function of stress intensity factor range [1,2]. As shown in figure 1 (right), crack growth rate is described as the increment in crack growth per increment in cycles (da/dN).…”

Section: Introductionmentioning

confidence: 99%

“…1 (left) [2]). This is an easy way of comparing different kinds of instrumentation and verifying their output with a visual confirmation.…”

Section: Introductionmentioning

confidence: 99%

Online fatigue crack growth monitoring with clip gauge and direct current potential drop

Tender

Micone

Waele

2016

SCAD

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Fatigue is a well-known failure phenomenon which has been and still is extensively studied. Often structures are designed according to the safe-life principle so no crack initiation occurs. Nowadays there is a high emphasis on cost-efficiency, and one might rather opt for a fail-safe design. Therefore a certain amount of crack growth can be allowed in structures, but then a good knowledge of stresses and related crack growth rates is needed. To this end, extensive studies are done to obtain a material's Paris law curve. Within the framework of research for offshore wind turbine constructions, tests were done to determine the crack growth rate of a high strength low alloy (HSLA) steel. A dedicated LabVIEW program was developed to be able to determine an entire Paris law curve with a single specimen, by controlling the stress intensity factor range (ΔK). The program is controlled by the readings of a clip gauge, which make it possible to plan the amount of crack growth per ΔK block and thus plan an entire test in advance. The potential drop technique was also applied in order to obtain the Paris law curve. Clip gauge results were compared with direct current potential drop monitoring. This comparison was done by means of an a/W-N diagram and the resulting Paris law curves. The results show a very good correlation between both methods and with the visual confirmation.

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“…Furthermore, the constants C and m are influenced by the applied stress ratio R = Kmin/Kmax, and crack closure effects are not taken into account. Therefore, a number of different crack propagation laws have been proposed, each one taking different factors into account [7]. One of the most detailed and commonly used is the so-called NASGRO equation [8]:…”

Section: Introductionmentioning

confidence: 99%

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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Good Practice for Fatigue Crack Growth Curves Description

Cited by 7 publications

References 11 publications

A RUL Estimation System from Clustered Run-to-Failure Degradation Signals

A RUL Estimation System from Clustered Run-to-Failure Degradation Signals

Online fatigue crack growth monitoring with clip gauge and direct current potential drop

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

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