Study of thermal effects associated with crack propagation during very high cycle fatigue tests

Ranc, Nicolas; Wagner, Danièle; Paris, Paul C.

doi:10.1016/j.actamat.2008.04.023

Cited by 113 publications

(105 citation statements)

References 13 publications

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“…These results have been already shown analytically [7] and numerically [8]. Furthermore it is important to note that Pippan and Stüwe [9] have also proved these results by experiments.…”

Section: The Temperature Field Due To the Heat Source Within The Revesupporting

confidence: 53%

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About the effect of plastic dissipation in heat at the crack tip on the stress intensity factor under cyclic loading

Ranc

Palin‐Luc

Paris

et al. 2014

International Journal of Fatigue

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. AbstractBecause of the reverse cyclic plastic zone at the crack tip, there is plastic dissipation in heat at the crack tip under cyclic loading. That creates a heterogeneous temperature field around the crack tip. A thermo-mechanical model is proposed in this paper for evaluating the consequence of this temperature field on the Mode I stress intensity factor. Two cases are studied: (i) the theoretical problem of an infinite plate with a semi-infinite through crack under Mode I cyclic loading, and (ii) a finite specimen with a central through crack. In the first case, the main hypothesis and results are presented from the literature but no heat loss is taken into account. In second case, heat loss by convection is taken into account with a finite element analysis, while an analytical solution exists in the literature for the first case. In both cases, it is assumed that the heat source is located in the reverse cyclic plastic zone. The heat source within the reverse cyclic plastic zone is quantified by experiments on a mild steel under R=0.1. It is shown that the crack tip is under compression due to thermal stresses coming from the heterogeneous temperature field around the crack tip. The effect of this stress field on the stress intensity factor (its maximum, minimum and its range) is calculated. This paper shows that experiments have to be carried out to determine the heat source within the reverse cyclic plastic zone. This is the key parameter to quantify the effect of dissipation at the crack tip on the stress intensity factor.

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“…These results have been already shown analytically [7] and numerically [8]. Furthermore it is important to note that Pippan and Stüwe [9] have also proved these results by experiments.…”

Section: The Temperature Field Due To the Heat Source Within The Revesupporting

confidence: 53%

“…The dissipated power per unit length of crack front is assumed to be proportional to the surface area of the reverse cyclic plastic zone and the loading frequency f [7]:…”

Section: The Temperature Field Due To the Heat Source Within The Revementioning

confidence: 99%

About the effect of plastic dissipation in heat at the crack tip on the stress intensity factor under cyclic loading

Ranc

Palin‐Luc

Paris

et al. 2014

International Journal of Fatigue

Self Cite

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“…High temperatures were reported during bearing wear, when fatigue crack propagation and spallation process were involved [6,12]. During a fatigue test at very high fatigue cycle regime, the temperature may grow locally and significantly before fracture [13]. At the moment of the formation of the fatigue crack, an increase of 0.07˚C was observed.…”

Section: Introductionmentioning

confidence: 94%

Evaluation of the Performance of Infrared Thermography for On-Line Condition Monitoring of Rotating Machines

Leemans¹,

Destain²,

Kilundu³

et al. 2011

ENG

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This study evaluated the possibility of infrared thermography to measure accurately the temperature of elements of a rotating device, within the scope of condition monitoring. The tested machine was a blower coupled to a 500 kW electric motor, that operated in multiples regimes. The thermograms were acquired by a fixed thermographic camera and were processed and recorded every 15 minutes. Because the normal temperature variations could easily mask a drift caused by a failure, a corrected temperature was computed using autorecursive models. It was shown that an efficient temperature correction should compensate for the variations of the process, and for the ambient temperatures variations, either daily or seasonal. The standard deviation of the corrected temperature was of a few tenth of degree, making possible the detection of a drift of less than one degree and the prediction of potential failure.

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“…Boulangeret et al [33] used the calorimetric analysis to estimate the thermoelastic energetic part and the dissipative part during fatigue tests of steel specimen. Ranc et al [34] studied the propagation of the crack in the gigacycles fatigue regime developing a thermomechanical model. They observed by infrared analysis that the propagation stage of the crack constitutes a small part of the lifetime of the specimen.…”

Section: -P2 14th International Conference On Experimental Mechmentioning

confidence: 99%

“…In the literature there are many analytical and numerical models that link the damage with energy and thermal variation for fatigue loading [25][26][27][28][29][30][31][32][33][34][35][36] and for static tensile test [37,38] and the hypothesis concerning the plasticization model, internal heat and external transmission, can help to find qualitative solutions only. Following the above easy engineering model, using the similar conditions assumed for the thermo-elasticity theory (adiabatic phenomena are accepted even at moderate strain rates), following the thermoelastic phase, the temperature vs test time can be written as: and ȕ =0,9 (constant) even if it is known that the Tailor coefficient is not constant particularly in the first strain rates [42,43].…”

Section: The Temperature In Static Tensile Testmentioning

confidence: 99%

Fatigue limit by thermal analysis of specimen surface in mono axial traction test

Risitano

Giacomo

Clienti

2010

EPJ Web of Conferences

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Abstract. In this work is indicated how it could be possible to evaluate the limit stress of the thermo-elastic phase of deformation by thermo-analysing the surface of the specimen during a static traction test. Adding the temperature curve measured on a small area of the surface (the hottest) to the classic stress-strain curve, it is possible to evaluate a limit temperature T 0 coincident with the beginning of the non linear trend of the curve. The corresponding stress value is coincident with the fatigue limit of the analyzed component. As an example, the results of traction tests performed on two notched specimens, where the change of linearity in the temperature curve during static traction test was evident, are reported. The corresponding value of stress was a good approximation of the fatigue limit for R = -1, determined by the conventional method. The aim of the reported examples in this paper must be interpreted as support to the basic principle of the method and not as the results of a complete experimental planning of which we will comment in an another occasion.1 Nomenclature E l energy required for fatigue fracture ĭ l integral of a surface point temperature, proportional to E l , at fatigue fracture ı stress ı 0 fatigue limit for R = -1 (limit stress above which some crystal is plasticized)) ı i minimum stress ı s maximum stress ı m mean stress ı p plastic stress ı 0,2 yield stress ı r fracture strength/original cross sectional area and t r is the test time with thermo plastic behaviour f loading frequency R stress ratio İ strain İ 0 strain corresponding to ı 0 a

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Study of thermal effects associated with crack propagation during very high cycle fatigue tests

Cited by 113 publications

References 13 publications

About the effect of plastic dissipation in heat at the crack tip on the stress intensity factor under cyclic loading

About the effect of plastic dissipation in heat at the crack tip on the stress intensity factor under cyclic loading

Evaluation of the Performance of Infrared Thermography for On-Line Condition Monitoring of Rotating Machines

Fatigue limit by thermal analysis of specimen surface in mono axial traction test

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