Passive vibration damping of a cantilever plate

Mohamed, Amr; Hassan, Ahmed; Omer, A. A.

doi:10.1088/1757-899x/973/1/012036

Cited by 3 publications

(6 citation statements)

References 9 publications

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“…The values of the interaction parameters for all viscous drag process are given elsewhere . The prediction of the above criterion (the original and the modified) for a transition in creep behavior from viscous drag control to climb control with decreasing normalized stress was shown to agree very well with the behavior of many solid‐solution alloys (Figure b,c).…”

Section: Discussionmentioning

confidence: 60%

“…The prediction of the above criterion (the original and the modified) for a transition in creep behavior from viscous drag control to climb control with decreasing normalized stress was shown to agree very well with the behavior of many solid‐solution alloys (Figure b,c). For example, it was demonstrated that the creep behavior of Al–Zn alloys, Al–Ag alloys, and Ni–Fe alloy (see the study by Mohamed for the data and the plots) was consistent with the modified criterion, as expressed by Equation .…”

Section: Discussionmentioning

confidence: 64%

“…Nevertheless, by examining the creep data of solid‐solution alloys including Al‐based solid‐solution alloys, it was showen that the transition stress between the region of viscous glide control ( n = 3) and region III agreed reasonably well with the critical stress required for the breakaway of dislocations from solute atom atmospheres; this critical stress is given by

{(\frac{τ}{G})}_{t} = 0.05 {c e}^{2} (\frac{{Gb}^{3}}{k T})

…”

Section: Discussionmentioning

confidence: 93%

“…Mathematically, according to this criterion, the condition of the transition from the metal class behavior to alloy class behavior can be written in the following form (Figure b)

\frac{T^{2}}{b^{6} {ce}^{2}} = \frac{B_{1} σ^{2}}{k^{2}} {(\frac{γ}{Gb})}^{3} \frac{D_{c}}{D_{g}}

where B 1 is a constant, c is the solute atomic concentration, and D c and D g are the appropriate diffusion coefficients for climb and glide, respectively. Later, the above equation was modified to express the criterion in the following normalized form (Figure c)

{(\frac{k T}{{ec}^{0.5} {Gb}^{2}})}^{2} = B_{2} {(\frac{γ}{Gb})}^{3} \frac{D_{c}}{D_{g}} {(\frac{τ}{G})}^{2}

where B 2 is a constant. Also, the analysis leading to the criterion was extended to describe the creep behavior of viscus drag‐controlled alloys under the condition of the operation of several different viscus drag processes such as Fisher interaction (short‐range‐order destruction) and Suzuki strengthening (the chemical interaction of solute atoms with extended dislocations), Snoek ordering (stress‐induced local ordering of solute atoms), and the antiphase boundary (APB) interaction in ordered alloys .…”

Section: Discussionmentioning

confidence: 99%

“…Later, the above equation was modified to express the criterion in the following normalized form (Figure c)

{(\frac{k T}{{ec}^{0.5} {Gb}^{2}})}^{2} = B_{2} {(\frac{γ}{Gb})}^{3} \frac{D_{c}}{D_{g}} {(\frac{τ}{G})}^{2}

(\frac{k T}{D_{g} b}) (\frac{1}{\sum A_{i}}) = B_{3} {(\frac{γ}{Gb})}^{3} \frac{D_{c}}{D_{g}} {(\frac{τ}{G})}^{2}

where the summation of all the interaction parameters that characterize various viscous drag processes is

\sum A_{i} = A_{C - J} false(Cottrell - Jaswon false) + A_{F} false(Fisher false) + A_{S} false(Suzuki false) + A_{S n} false(Snoek false) + A_{A P B}

…”

Section: Discussionmentioning

confidence: 99%

See 4 more Smart Citations

Creep and Superplasticity: Evolution and Rationalization

Mohamed

2020

Adv Eng Mater

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Detailed studies on the creep behavior of materials are of scientific and practical significance. From a scientific point of view, data obtained from such studies are critical to the characterization of creep behavior in terms of deformation mechanisms. From a practical point of view, information inferred from such studies is useful because of its relevance to many design considerations. Over the past several decades, much progress has been made in rationalizing the creep behavior of metals and solid‐solution alloys. Such progress is extended to understanding the creep behavior of new classes of materials such as powder metallurgy (PM) Al alloys, discontinuous SiC composites, superplastic alloys, and high‐entropy alloys (HEAs). Progress in micrograin superplasticity (1 μm < d < 10 μm, where d is the grain size) has been applied to the emergence of high strain rate (HSR) superplasticity using ultrafine‐grained alloys (0.3 μm < d < 1 μm). The concept of creep is utilized to develop a deformation mechanism for nanocrystalline (nc) materials (d < 100 nm). Using the details of this mechanism, it is possible (1) to explain why the behavior of nc material is not superplastic and 2) to predict a transition from superplastic behavior to nc behavior.

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Section: Discussionmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 64%

{(\frac{τ}{G})}_{t} = 0.05 {c e}^{2} (\frac{{Gb}^{3}}{k T})

…”

Section: Discussionmentioning

confidence: 93%

“…Mathematically, according to this criterion, the condition of the transition from the metal class behavior to alloy class behavior can be written in the following form (Figure b)

\frac{T^{2}}{b^{6} {ce}^{2}} = \frac{B_{1} σ^{2}}{k^{2}} {(\frac{γ}{Gb})}^{3} \frac{D_{c}}{D_{g}}

{(\frac{k T}{{ec}^{0.5} {Gb}^{2}})}^{2} = B_{2} {(\frac{γ}{Gb})}^{3} \frac{D_{c}}{D_{g}} {(\frac{τ}{G})}^{2}

Section: Discussionmentioning

confidence: 99%

“…Later, the above equation was modified to express the criterion in the following normalized form (Figure c)

{(\frac{k T}{{ec}^{0.5} {Gb}^{2}})}^{2} = B_{2} {(\frac{γ}{Gb})}^{3} \frac{D_{c}}{D_{g}} {(\frac{τ}{G})}^{2}

(\frac{k T}{D_{g} b}) (\frac{1}{\sum A_{i}}) = B_{3} {(\frac{γ}{Gb})}^{3} \frac{D_{c}}{D_{g}} {(\frac{τ}{G})}^{2}

where the summation of all the interaction parameters that characterize various viscous drag processes is

\sum A_{i} = A_{C - J} false(Cottrell - Jaswon false) + A_{F} false(Fisher false) + A_{S} false(Suzuki false) + A_{S n} false(Snoek false) + A_{A P B}

…”

Section: Discussionmentioning

confidence: 99%

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Creep and Superplasticity: Evolution and Rationalization

Mohamed

2020

Adv Eng Mater

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Effect of damping material thickness on vibration analysis in pretension layer damping process

Mohamed

Omer

Hassan

2021

IOP Conf. Ser.: Mater. Sci. Eng.

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Vibration reduction is a critical necessity in many fields of engineering, technology, and industry. As a result, there is a need for vibration management. To restrict or adjust the system’s vibration response, a variety of techniques are employed. In recent years, there has been a lot of enthusiasm for the easy implementation of these vibration-control structures. The damping properties of viscoelastic materials tend to be excellent. Damping is determined by the material’s ability to dissipate energy. To minimise the vibration of vibrating surfaces, viscoelastic materials are commonly used. In this study, viscoelastic material (Dyad 606) is applied on the AL plate in the form of free layer damping and pretension layer damping. First aluminium structure using free layer damping and another one using pretension layer damping by applying tension load (two layers of damping plates, one on the top surface of the Al alloy and the other on the lower face). Passive vibration damping of the plate is achieved. These layers are influenced by axial uniform distributed load. The damping behaviour of the AL Plate is discussed in relation to the thickness variation of the pre-tension damping material. The results show that the loss factor and the attenuation percentage of the structure with pretension layer damping are increased as compared to free layer damping. It is also found that the most effective thickness of the damping material to increase the damping capacity of the framework is around half the base plate thickness

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Towards Highly Efficient, Additively Manufactured Passive Vibration Eliminators for Mechanical Systems

et al. 2023

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Structural damping largely determines the dynamic properties of mechanical structures, especially those whose functioning is accompanied by time-varying loads. These loads may cause vibrations of a different nature, which adversely affects the functionality of the structure. Therefore, many studies have been carried out on vibration reduction methods over the last few years. Among them, the passive vibration damping method, wherein a suitable polymer system with appropriate viscoelastic properties is used, emerges as one of the simplest and most effective methods. In this view, a novel approach to conduct passive elimination of vibrations, consisting of covering elements of structures with low dynamic stiffness with polymeric pads, was developed. Herein, polymer covers were manufactured via fused filament fabrication technology (3D printing) and were joined to the structure by means of a press connection. Current work was focused on determining the damping properties of chosen polymeric materials, including thermoplastic elastomers (TPE). All investigated materials were characterized by means of differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), and mechanical properties (tensile test and Shore hardness). Lastly, the damping ability of pads made from different types of polymers were evaluated by means of dynamic tests.

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Passive vibration damping of a cantilever plate

Cited by 3 publications

References 9 publications

Creep and Superplasticity: Evolution and Rationalization

Creep and Superplasticity: Evolution and Rationalization

Effect of damping material thickness on vibration analysis in pretension layer damping process

Towards Highly Efficient, Additively Manufactured Passive Vibration Eliminators for Mechanical Systems

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