Characterization of fretting fatigue crack initiation processes in CR Ti–6Al–4V

Hutson, A. L.; Neslen, Craig L.; Nicholas, T.

doi:10.1016/s0301-679x(02)00138-x

Cited by 31 publications

(7 citation statements)

References 16 publications

(30 reference statements)

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“…In addition to residual stresses fields, surface roughness has been identified as having a significant influence on the degradation and fatigue behaviour of several critical components, especially due to corrosión and fretting fatigue [20][21]. A typical consequence of the application of the LSP technique at high ELOF's is the generation on the treated surface of roughness patterns typically smoother than those of the original workpiece, a feature that has to be considered as highly favourable in comparison with the corresponding results obtained by surface treatments based on thermal processing or other mechanical treatments with comparatively lower intensity and overlapping factors, such as, typically, shot peening.…”

Section: Surface Compactation and Roughnessmentioning

confidence: 99%

Induction of Engineered Residual Stresses Fields and Associate Surface Properties Modification by Short Pulse Laser Shock Processing

Ocaña

Morales

Porro

et al. 2010

MSF

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Láser shock processing (LSP) is consolidating as an effective technology for the improvement of metallic materials surface properties involving their fatigue life. The main acknowledged advantage of the LSP technique consists on its capability of inducing a relatively deep compression residual stresses field into metallic alloy pieces allowing an improved mechanical behaviour, explicitly the life improvement of the treated specimens against wear, crack growth and stress corrosión cracking. Progress accomplished by the authors in the line of practical development of the LSP technique at an experimental level, aiming its integral assessment from an interrelated theoretical and experimental point of view, is presented in this paper. Concretely, experimental results on the residual stress profiles and associated surface properties modification successfully reached in typical materials (especially Al and Ti alloys) under different LSP irradiation conditions are presented, a correlated analysis of the residual stress profiles obtained under different irradiation strategies and the evaluation of the corresponding induced surface properties as roughness and wear resistance being also presented. Through a coupled theoretical-experimental analysis the real possibilities of the LSP technique as a possible substitutive of related traditional surface modification techniques as, for example, shot peening.

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Section: Surface Compactation and Roughnessmentioning

confidence: 99%

Induction of Engineered Residual Stresses Fields and Associate Surface Properties Modification by Short Pulse Laser Shock Processing

Ocaña

Morales

Porro

et al. 2010

MSF

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“…Some differences exist in the test conditions produced by a dovetail fixture compared with other fretting fatigue fixtures. [6][7][8] The primary difference is that the normal force, P, and shear force, Q, vary during the test unlike many other fretting experiments in which P is constant. This results in a varying contact area and more closely simulates the contact in a blade to disk attachment.…”

Section: B a C K G R O U N Dmentioning

confidence: 99%

“…The dovetail test set‐up is a laboratory experiment designed to simulate some of the conditions present in the blade to disk attachment in a turbine engine. Some differences exist in the test conditions produced by a dovetail fixture compared with other fretting fatigue fixtures 6–8 . The primary difference is that the normal force, P , and shear force, Q , vary during the test unlike many other fretting experiments in which P is constant.…”

Section: Introductionmentioning

confidence: 99%

The effect of angle on dovetail fretting experiments in Ti‐6Al‐4V

Golden

Nicholas

2005

Fatigue Fract Eng Mat Struct

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A B S T R A C T The objective of this work was to compare the fretting fatigue performance of Ti-6Al-4V dovetail specimens on Ti-6Al-4V pads having various contact angles typical of engine hardware; 35 • , 45 • and 55 • dovetail angles were considered. The dovetail fixtures were instrumented with strain gages so that the local normal and shear contact forces could be calculated. The contact force hysteresis loops were recorded showing the stick-slip history. At R = 0.1, gross slip was observed for several thousand cycles followed by partial slip after the average coefficient of friction increased. At R = 0.5, gross slip was present only during the first half cycle. During partial slip, the slope of the shear versus normal force was a function of the dovetail angle. The local contact loads, therefore, differed for the same remotely applied force. Despite this, the fretting fatigue life depended primarily on the remotely applied load not dovetail angle.

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“…To take advantage of the test data locked into the unfailed end of the fretting fatigue sample, a double-dogbone specimen has been developed and used in some prior experiments. These specimens were devised so that the fretting condition could be removed prior to fracture, and the resulting damage zone tested under uniaxial fatigue conditions to evaluate the effect of the damage on material fatigue strength [5]. Through fractography, any existing fretting cracks can then be identified and measure.…”

Section: Fretting Fixturesmentioning

confidence: 99%

Fatigue Loading and Life Prediction in Three Fretting Fatigue Fixtures

et al. 2008

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Three fixtures for conducting laboratory fretting fatigue tests are described and their respective testing methods and the results of the analysis are compared. Each of these fixtures has been used to investigate the effects of various parameters of interest in fretting fatigue. These fixtures include a unique apparatus in which all load applied to the specimen is transferred to the fretting pads, an apparatus similar to many found in the literature where partial load transfer occurs across the pads, and a simplified dovetail fixture in which the clamping load, P, and the shear load, Q, are varied in phase. Select test conditions from prior experiments performed on identical material and resulting in similar lives ranging from one to ten million cycles from these fixtures are identified. The various testing conditions were used to compute the unique stress field for each case. The resulting contact stresses were used to calculate crack initiation based criteria, and to calculate stress intensity factors. The three fixtures were shown to be able to accommodate a range of loads, fretting pad contours, and specimen geometries that produced a variety of stress fields. A crack-initiation-based criterion was shown to predict the failure lives of thinner specimens accurately. The stress intensity factor calculations showed the possibility of a crack arresting for a stress field that decays rapidly and the possibility of a local minimum for K as a function of depth. The fixtures are shown to be complementary in generating data for development of robust fretting fatigue models that use these criteria.

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Characterization of fretting fatigue crack initiation processes in CR Ti–6Al–4V

Cited by 31 publications

References 16 publications

Induction of Engineered Residual Stresses Fields and Associate Surface Properties Modification by Short Pulse Laser Shock Processing

Induction of Engineered Residual Stresses Fields and Associate Surface Properties Modification by Short Pulse Laser Shock Processing

The effect of angle on dovetail fretting experiments in Ti‐6Al‐4V

Fatigue Loading and Life Prediction in Three Fretting Fatigue Fixtures

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