Thermal Fatigue Analyses of Riveted Structures

Yeter, Eyüp

doi:10.5755/j01.mech.24.5.21288

Cited by 2 publications

(1 citation statement)

References 26 publications

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“…In addition, depending on the geometry of the exhaust duct, the tail boom may experience additional thermal stresses from the exhaust plume, leading to premature failure. 1 This is especially important, since recent improvements in power-toweight ratios of turbo-shaft engines used in helicopters incurs higher exhaust temperatures. 2 Investigations into helicopter exhaust plumes are highly complex and usually split into component studies.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of helicopter engine exhaust through scaled experiments using stereoscopic particle image velocimetry

Teo

Wong

Lee

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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Helicopter engines are often mounted atop the fuselage to keep the aircraft footprint small and optimal for operations. As a result, hot gases produced by the engines may inadvertently impinge upon the tail boom or dissipate inefficiently that compromises on operation safety. In this study, a scaled fuselage model with a hot air blower was used to simulate hot exhaust gases. The velocity field immediately outside the exhaust port was measured through stereoscopic particle image velocimetry to capture the trajectory and flow behaviour of the gases. Two cases were considered: freestream to exhaust velocity ratios of 0 (no freestream velocity) and 0.46 (co-flowing free stream), respectively. The formation of a counter-rotating vortex pair was detected for both cases but were opposite in the rotational sense. For the case without freestream, the plume formed into a small “kidney” shape, before expanding and dissipating downstream. For the case with freestream, the plume formed into a slenderer and more elongated “reversed-C” shape as compared to the case without freestream. It also retained its shape further downstream and maintained its relative position. These observations on the trajectory and shape of plume provide basis to understanding the nature and interaction of the plume with its surroundings.

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Section: Introductionmentioning

confidence: 99%

Characteristics of helicopter engine exhaust through scaled experiments using stereoscopic particle image velocimetry

Teo

Wong

Lee

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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Probabilistic Analysis of Fatigue Behavior of Single Lap Riveted Joints

et al. 2020

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This research deals with the fatigue behavior of 200 small single lap multiple-riveted joint specimens, widely used for aeronautic structures. The tests were performed with three different levels of stress with stress ratio R = 0.05; three levels were set: 90 MPa, 120 MPa and 160 MPa. The fatigue life and critical crack size for all tested specimens were analyzed. According to the results’ analysis, two types of fracture, through-hole and in proximity of the hole, were observed, depending on the level of stress: the higher the applied stress, the more through-hole cracking. Indeed, under the fatigue load with a stress level of 90 MPa, less than 30% of specimens showed cracks propagating through the hole, while, at the stress level of 120 MPa, the percentage reaches 36.3%. At the stress level of 160 MPa, 100% of specimens failed through the hole. Moreover, aimed to use experimental data for probabilistic methods, a statistical analysis was performed according to the Anderson–Darling test. This method allowed the analysis of the datasets, in terms of both fatigue life and critical crack size, providing information about the best distribution function able to fit experimental results.

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Thermal Fatigue Analyses of Riveted Structures

Cited by 2 publications

References 26 publications

Characteristics of helicopter engine exhaust through scaled experiments using stereoscopic particle image velocimetry

Characteristics of helicopter engine exhaust through scaled experiments using stereoscopic particle image velocimetry

Probabilistic Analysis of Fatigue Behavior of Single Lap Riveted Joints

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