Linear and nonlinear characterization of limestone rock using a non-collinear ultrasonic wave mixing

2014 ◽  
Author(s):  
Megan E. McGovern ◽  
Henrique L. Reis
Keyword(s):  
Ultrasonic Wave ◽  
Wave Mixing ◽  
Nonlinear Characterization ◽  
Linear And Nonlinear ◽  
Limestone Rock

scholarly journals Linear and nonlinear characterization of low-stress high-confinement silicon-rich nitride waveguides: erratum

2017 ◽  
Vol 25 (7) ◽  
pp. 7443 ◽  
Author(s):  
Clemens J. Krückel ◽  
Attila Fülöp ◽  
Thomas Klintberg ◽  
Jörgen Bengtsson ◽  
Peter A. Andrekson ◽  
...  
Keyword(s):  
Nonlinear Characterization ◽  
Linear And Nonlinear

scholarly journals Linear and nonlinear characterization of low-stress high-confinement silicon-rich nitride waveguides

2015 ◽  
Vol 23 (20) ◽  
pp. 25827 ◽  
Author(s):  
Clemens J. Krückel ◽  
Attila Fülöp ◽  
Thomas Klintberg ◽  
Jörgen Bengtsson ◽  
Peter A. Andrekson ◽  
...  
Keyword(s):  
Nonlinear Characterization ◽  
Linear And Nonlinear

Linear and nonlinear characterization of polyDCHD-HS films

2000 ◽  
Vol 115 (1-3) ◽  
pp. 257-260 ◽  
Author(s):  
E Giorgetti ◽  
G Margheri ◽  
S Sottini ◽  
Xianfeng Chen ◽  
A Cravino ◽  
...  
Keyword(s):  
Nonlinear Characterization ◽  
Linear And Nonlinear

Linear and nonlinear characterization of surfaces from a laser beam melt ablation process

2006 ◽  
Vol 39 (7) ◽  
pp. 1405-1412 ◽  
Author(s):  
Kevin Bube ◽  
Camilo Rodrigues Neto ◽  
Reik Donner ◽  
Udo Schwarz ◽  
Ulrike Feudel
Keyword(s):  
Laser Beam ◽  
Ablation Process ◽  
Nonlinear Characterization ◽  
Linear And Nonlinear

Rheological characterization of tack and viscoelasticity of compositions of crepe coating used in the Yankee dryer

TAPPI Journal ◽  
2019 ◽  
Vol 18 (11) ◽  
pp. 641-649
Author(s):  
JOSHUA OMAMBALA ◽  
CARL MCINTYRE
Keyword(s):  
Normal Force ◽  
Weight Ratio ◽  
Good Combination ◽  
Rheological Characterization ◽  
Nonlinear Viscoelastic ◽  
Coating Composition ◽  
Linear And Nonlinear ◽  
Work Done ◽  
Tissue Production

The vast majority of tissue production uses creping to achieve the required set of properties on the base sheet. The Yankee coating helps to develop the desired crepe that in turn determines properties such as bulk and softness. The adhesion of the sheet to the Yankee surface is a very important characteristic to consider in achieving the desired crepe. The coating mix usually consists of the adhesive, modifier, and release. A good combination of these components is essential to achieving the desired properties of the tissue or towel, which often are determined by trials on the machine that can be time consuming and lead to costly rejects. In this paper, five compositions of an industrial Yankee coating adhesive, modifier, and release were examined rheologically. The weight ratio of the adhesive was kept constant at 30% in all five compositions and the modifier and release ratios were varied. The normal force and work done by the different compositions have been shown at various temperatures simulating that of the Yankee surface, and the oscillatory test was carried out to explain the linear and nonlinear viscoelastic characteristic of the optimal coating composition.

scholarly journals Linear and Nonlinear Normal Interface Stiffness in Dry Rough Surface Contact Measured Using Longitudinal Ultrasonic Waves

2021 ◽  
Vol 11 (12) ◽  
pp. 5720
Author(s):  
Saeid Taghizadeh ◽  
Robert Sean Dwyer-Joyce
Keyword(s):  
Rough Surface ◽  
Contact Pressure ◽  
Ultrasonic Wave ◽  
Bulk Material ◽  
Nonlinear Differential Equations ◽  
Small Deformation ◽  
Ultrasonic Waves ◽  
Solid Contact ◽  
Interfacial Stiffness ◽  
Linear And Nonlinear

When two rough surfaces are loaded together contact occurs at asperity peaks. An interface of solid contact regions and air gaps is formed that is less stiff than the bulk material. The stiffness of a structure thus depends on the interface conditions; this is particularly critical when high stiffness is required, for example in precision systems such as machine tool spindles. The rough surface interface can be modelled as a distributed spring. For small deformation, the spring can be assumed to be linear; whilst for large deformations the spring gets stiffer as the amount of solid contact increases. One method to measure the spring stiffness, both the linear and nonlinear aspect, is by the reflection of ultrasound. An ultrasonic wave causes a perturbation of the contact and the reflection depends on the stiffness of the interface. In most conventional applications, the ultrasonic wave is low power, deformation is small and entirely elastic, and the linear stiffness is measured. However, if a high-powered ultrasonic wave is used, this changes the geometry of the contact and induces nonlinear response. In previous studies through transmission methods were used to measure the nonlinear interfacial stiffness. This approach is inconvenient for the study of machine elements where only one side of the interface is accessible. In this study a reflection method is undertaken, and the results are compared to existing experimental work with through transmission. The variation of both linear and nonlinear interfacial stiffnesses was measured as the nominal contact pressure was increased. In both cases interfacial stiffness was expressed as nonlinear differential equations and solved to deduce the contact pressure-relative surface approach relationships. The relationships derived from linear and nonlinear measurements were similar, indicating the validity of the presented methods.

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