Effect of Shot Peening on Low Cycle Fatigue Life of Compressor Disc of a Typical Fighter Class Aero-Engine

Sahoo, Bijaylaxmi; Satpathy, R. K.; Prasad, Kartik; Ahmed, Shahnawaz; Kumar, Vikas

doi:10.1016/j.proeng.2013.03.233

Cited by 14 publications

(12 citation statements)

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“…The residual stress profile induced by shot peening has been well characterised by a wide range of previous studies. [91][92][93][94] The typical form of a shot-peened residual stress profile is outlined in the following section with the exact distribution depending on the shot peening parameters applied.…”

Section: Micro Ring-core Drilling and Related Techniques For Residualmentioning

confidence: 99%

A state-of-the-art review of micron-scale spatially resolved residual stress analysis by FIB-DIC ring-core milling and other techniques

Lunt

Baimpas

Salvati

et al. 2015

The Journal of Strain Analysis for Engineering Design

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Quantification of residual stress gradients can provide great improvements in understanding the complex interactions between microstructure, mechanical state, mode(s) of failure and structural integrity. Highly focused local probe nondestructive techniques such as X-ray diffraction, electron diffraction or Raman spectroscopy have an established track record in determining spatial variations in the relative changes in residual stress with respect to a reference state for many structural materials. However, the interpretation of these measurements in terms of absolute stress values requires a strain-free sample often difficult to obtain due to the influence of chemistry, microstructure or processing route. With the increasing availability of focused ion beam instruments, a new approach has been developed which is known as the micro-scale ring-core focused ion beam-digital image correlation technique. This technique is becoming the principal tool for quantifying absolute in-plane residual stresses. It can be applied to a broad range of materials: crystalline and amorphous metallic alloys and ceramics, polymers, composites and biomaterials. The precise nano-scale positioning and welldefined gauge volume of this experimental technique make it eminently suitable for spatially resolved analysis, that is, residual stress profiling and mapping. Following a summary of micro-stress evaluation approaches, we focus our attention on focused ion beam-digital image correlation methods and assess the application of micro-scale ring-core methods for spatially resolved residual stress profiling. The sequential ring-core milling focused ion beam-digital image correlation method allows micro-to macro-scale mapping at the step of 10-1000 mm, while the parallel focused ion beam-digital image correlation approach exploits simultaneous milling operation to quantify stress profiles at the micron scale (1-10 mm). Cross-validation against X-ray diffraction results confirms that these approaches represent accurate, reliable and effective residual stress mapping methods.

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Section: Micro Ring-core Drilling and Related Techniques For Residualmentioning

confidence: 99%

A state-of-the-art review of micron-scale spatially resolved residual stress analysis by FIB-DIC ring-core milling and other techniques

Lunt

Baimpas

Salvati

et al. 2015

The Journal of Strain Analysis for Engineering Design

View full text Add to dashboard Cite

show abstract

“…The fatigue life was longer in vacuum than air and at the same crack size 585 the fatigue crack growth rate was higher in air than vacuum. 4. In air, the initiation life was 9217 cycles, equivalent to 76% of the total life (N f = 12149), whereas in vacuum initiation occurred after 19726 cycles, equivalent to 85% of the total fatigue life (N f = 23204).…”

Section: Discussionmentioning

confidence: 98%

“…IMI 834 is often used with ∼10-15% volume fraction of globular primary alpha, in a transformed beta matrix, in order to provide a well balanced creep-fatigue response [2,3]. However, compressor disks are often subjected to cold working before entering service, in order to increase resistance to fatigue [4]. This is 15 achieved by surface treatment to produce compressive residual stresses at the surface.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of short fatigue cracks in titanium alloy IMI 834 using X-ray microtomography

et al. 2015

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A first attempt at the three-dimensional evaluation of naturally initiated surface connected and internal fatigue cracks is presented. Fatigue crack initiation and growth in air and vacuum environments have been investigated through Xray microtomography in air and vacuum environments at elevated temperatures (350• C), accompanied by post-mortem electron microscopy of the fracture surfaces. In vacuum (< 10 −5 mbar), multiple internal and surface-connected crack initiation was observed, but only the surface-connected cracks grew. In contrast, fewer cracks formed in air, these were mostly surface-connected and all were observed to grow. In all instances the initiation features were associated with globular primary α. An improved fatigue life was found in vacuum, which was mostly a consequence of delayed initiation, but was also due to slower fatigue crack propagation. The non-propagation of internal cracks was taken to imply that even the good laboratory vacuum obtained here was insufficient to simulate the conditions obtained for an internal crack in a component. The crack shape evolved towards a semi-circular shape a/c = 1 in air during fatigue crack growth, whilst the vacuum cracks remained semi-elliptical (a/c 1.4). This was taken to imply that oxide-induced crack closure played a role in fatigue crack growth in air.

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“…The effect of these changes is an increase in the microhardness [2] and creation of compressive residual stresses in the surface layer [19,22,14]. Another advantage of shot peening is the possibility of increasing the fatigue strength and life of the elements subjected to variable loads [13,18]. The beneficial effect of shot peening, apart from improving the properties of the surface layer is also deburring and rounding of the workpiece edges [9].…”

Section: Introductionmentioning

confidence: 99%

Influence of Centrifugal Shot Peening Parameters on the Impact Force and Surface Roughness of EN-AW 2024 Aluminum Alloy Elements

Skoczylas¹

2021

Adv. Sci. Technol. Res. J.

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This article presents the results of experimental studies on the influence of centrifugal shot peening parameters on the impact force F u occurring during the machining of the EN-AW 2024 aluminum alloy. The surface roughness parameters Ra, Rt, Rpk, Rvk and surface topography were also analyzed. Centrifugal shot peening was carried out on the FV-580a vertical machining center using a centrifugal shot peening head. Variable parameters of the centrifugal shot peening were: tangential speed v g and infeed g. On the basis of the results obtained, it was found that the increase the tangential speed v g and the infeed g causes an increase of the impact force. After centrifugal shot peening, numerous micro-cavities were formed on the surface of the EN-AW 2024 aluminum alloy samples, which may can accumulate lubricants in their space. During centrifugal shot peening, low values impact force F u were obtained, which confirms the legitimacy of using this method as a finishing machining of elements with low stiffness.

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Effect of Shot Peening on Low Cycle Fatigue Life of Compressor Disc of a Typical Fighter Class Aero-Engine

Cited by 14 publications

References 0 publications

A state-of-the-art review of micron-scale spatially resolved residual stress analysis by FIB-DIC ring-core milling and other techniques

A state-of-the-art review of micron-scale spatially resolved residual stress analysis by FIB-DIC ring-core milling and other techniques

Characterisation of short fatigue cracks in titanium alloy IMI 834 using X-ray microtomography

Influence of Centrifugal Shot Peening Parameters on the Impact Force and Surface Roughness of EN-AW 2024 Aluminum Alloy Elements

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