&lt;title&gt;Cocured viscoelastic composites&lt;/title&gt;

Maly, Joseph R.; Johnson, Conor D.

doi:10.1117/12.239104

Cited by 11 publications

(8 citation statements)

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“…Maly and Johnson 11 studied the impact of curing and cocuring on the properties of 3 M 9473 (an acrylic, pressure sensitive adhesive) at a wide range of frequencies and temperatures. The behaviour of this material is very similar to the behaviour of VHB studied in this work.…”

Section: Effect Of Cocuringmentioning

confidence: 99%

“…A viscoelastic layer cocured in composite prepreg panels has been found to significantly improve the damping of the structure [8][9][10] although it was reported that cocuring was decreasing the properties of the viscoelastic layer itself. 11 The insertion of a damping layer has been studied in terms of delamination of the composite structure 12 and interaction between the damping layer and the laminates. 13 Those studies were made on beams or panels where interaction between the viscoelastic layer and the rest of the structure is hardly measurable because the presence of the viscoelastic layer itself changes the stiffness and weight of the sample.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic characterization of viscoelastic materials used in composite structures

Fotsing

Sola

Ross

et al. 2013

Journal of Composite Materials

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The main focus of this paper is the experimental comparative analysis of the viscoelastic properties of acrylic- and silicon-based viscoelastic materials. These materials are widely used in the aeronautic industry for structural and/or damping applications. It is therefore required to determine their viscoelastic properties such as shear modulus and loss factor following their integration to aircraft composite structures. The influence of material thickness, bonding quality, curing and cocuring with composite material was evaluated using dynamic mechanical analysis machine in plan shear configuration. This comparative analysis in the 0–600 Hz frequency range provides useful information that should be taken into consideration when designing bonded joints for structural and/or damping applications. The small variation of the acrylic-based material loss factor over a wide range of frequencies suggests that this material is a good candidate for damping applications at room temperature in metallic structures where no curing is required. However, cocuring of acrylic-based material with composite laminae increases its shear modulus up to six times with respect to the uncured material whereas its loss factor is reduced by about 20%. On the other hand, the silicon-based material remains stable after thermal treatment (curing and cocuring) suggesting that it is well suited for in situ damping treatment involving laminate composite structure. However, at room temperature its shear modulus after cocuring is lowered by almost 25% due to poor bonding quality, which depends on the nature of the substrate.

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Section: Effect Of Cocuringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic characterization of viscoelastic materials used in composite structures

Fotsing

Sola

Ross

et al. 2013

Journal of Composite Materials

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“…Varela [1] proposed to introduce a layer of pure viscoelastic within the laminate, to dampen the noise and reduce microcracks on structural surfaces. Maly [2] also proposed the design of a composite material with several layers in multiple directions to cushion the impacts on a GFRP laminate. They take advantage of the high rigidity of composite materials [3] but lower damping, combining high levels of energy dissipation with minimal structural rigidity.…”

Section: Introdutionmentioning

confidence: 99%

Viscoelastic Layer Insertion to Reduce the Propagation of Energy by Vertical Impacts on GFRP Laminates

Muñoz¹,

Townsend²,

Suárez³

2020

Proceedings of the 18th LACCEI International Multi-Conference for Engineering, Education, and Technology: Engineering, Integrat

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The insertion of a viscoelastic layer is proposed to mitigate damage by vertical impact. For this purpose, unmodified GFRP panels and others modified with the viscoelastic sheet are made. With the use of an accelerometer, the force of the vertical impacts due to weight drop on the panels is measured, in order to quantify the critical points of damage. The absorbed energy is obtained through the mathematical formulation developed for this purpose. Damage is observed qualitatively by characterizing with penetrating inks to establish a comparison between viscoelastic-modified panels and non-modified panels. Impact force versus time curves are presented to assess damage mitigation in the GFRP. The benefits of the modification are evaluated, and its protection to the laminate is checked.

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“…It implies that higher stiffness and lower density materials possess higher natural frequency and hence higher damping capacity [1]. Viscoelastic materials are inserted into structural components to damp vibrations in structures in aerospace satellites, electrical and automobile components [2,3]. One potential means of obtaining material of higher damping capacity is through sandwich structures [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Foam Density and Skin Material on the Damping Behavior of Polyurethane Sandwich Structures

Sharma¹,

Murthy²,

Krishna³

2004

Journal of Reinforced Plastics and Composites

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In this article, the effects of polyurethane foam (PUF) density and skin materials, namely, e-glass/ epoxy and e-glass/polyester on the damping behavior of PUF sandwich structures were investigated in the temperature range À20 to 100 C using Rheovibron dynamic mechanical analyzer. Three types of specimens, viz. Epoxy/Glass-PUF-Epoxy/Glass (EPE), Polyester/Glass-PUF-Polyester/Glass (PPP) and Epoxy/Glass-PUF-Polyester/Glass (EPP) with three foam densities (0.6, 0.65 and 0.7 gm/cc) were considered. The effects of the skin material, the density of foam, the interface bonding between the skin, and the foam and the operating temperature on the damping mechanism of the sandwich structures are discussed. The experimental results showed the maximum peak damping capacity at 0 C in case of PPP specimens for a foam density 0.6 gm/cc. The damping capacity initially increased in the temperature range À20 to 0 C, attained peak value at 0 C, further decreased marginally up to 60 C and finally, drastically decreased in the temperature range 60-100 C.

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<title>Cocured viscoelastic composites</title>

Cited by 11 publications

References 0 publications

Dynamic characterization of viscoelastic materials used in composite structures

Dynamic characterization of viscoelastic materials used in composite structures

Viscoelastic Layer Insertion to Reduce the Propagation of Energy by Vertical Impacts on GFRP Laminates

Effect of Foam Density and Skin Material on the Damping Behavior of Polyurethane Sandwich Structures

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