Damping behavior of typical titanium alloys by varied frequency micro harmonic vibration at cryogenic temperatures

Liu, Wei; Wang, Nan; Chen, Yongnan; Hou, Zhimin; Zhao, Qinyang; Ouyang, Wenbo; Yan, Kang; Wu, Gang; Zhu, Lixia; Zhao, Yongqing

doi:10.1016/j.jmrt.2022.11.028

Cited by 4 publications

(2 citation statements)

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“…It should also be noted that the damping ratio ζ of a material or system is equal to half of the loss factor, i.e., ζ = tanδ/2. The loss factor of the α-Ti was chosen in accordance with some very recent experimental measurements obtained for the specific Ti phase, by applying micro-harmonic vibrations close to the room temperature and at a frequency of f = 100 Hz [19]. The CNOs, which were used to achieve the primary reinforcement of the α-Ti, were treated as continuum isotopic nanoparticles.…”

Section: Alphα Titanium Alloymentioning

confidence: 99%

“…In this work, given the above-mentioned observations, a finite element procedure is formulated with the main aim of approximating the damping behavior and other mechanical characteristics of titanium filled with CNOs. The idea lies in the fact that the characteristic multilayer hollow structure of CNOs could contribute to the enhancement of the damping of titanium and its alloys, which is a very important requirement for applications where vibrational and impact loadings are present [16][17][18][19]. The CNOs are practically spherical formations of multilayer graphene whose good damping capacity at a low-frequency regime has already been demonstrated [20].…”

Section: Introductionmentioning

confidence: 99%

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Carbon Nano-Onions as Nanofillers for Enhancing the Damping Capacity of Titanium and Fiber-Reinforced Titanium: A Numerical Investigation

Giannopoulos,

Batsoulas

2023

Metals

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Improving the damping capacity of metal matrix composites is crucial, especially for applications in the aerospace industry where reliable performance against vibrations and shocks is mandatory. The main objective of the present study is the numerical prediction of the damping behavior of alpha titanium matrix nanocomposites reinforced with hollow carbon nano-onions at various volume fractions. According to the proposed numerical scheme, a structural transient analysis is implemented using the implicit finite element method (FEM). The metal matrix nanocomposites are modeled via the utilization of appropriate representative volume elements. To estimate the mechanical and damping behavior of the nanocomposite representative volume elements, axial sinusoidally time-varying loads are applied to them. The damping capacity of the metal matrix nanocomposites is then estimated by the arisen loss factor, or equivalently the tan delta, which is computed by the time delay between the input stress and output strain. The analysis shows that the loss factor of alpha titanium may be improved up to 60% at 100 Hz by adding 5 wt% carbon nano-onions. The numerical outcome regarding the dynamic properties of the carbon nano-onions/alpha titanium nanocomposites is used in a second-level analysis to numerically predict their damping performance when they are additionally reinforced with unidirectional carbon fibers, using corresponding representative volume elements and time-varying loadings along the effective direction. Good agreement between the proposed computational and other experimental predictions are observed regarding the stiffness behavior of the investigated metal matrix nanocomposites with respect to the mass fraction of the carbon-onion nanofillers in the titanium matrix.

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Section: Alphα Titanium Alloymentioning

confidence: 99%