The study of the mechanical impedance of foods and biomaterials to characterize their linear viscoelastic behavior at high frequencies

2008 ◽  
Vol 47 (7) ◽  
pp. 727-737 ◽  
Author(s):  
Behic Mert ◽  
Osvaldo H. Campanella
Keyword(s):  
Viscoelastic Behavior ◽  
Mechanical Impedance ◽  
High Frequencies ◽  
Linear Viscoelastic Behavior ◽  
Linear Viscoelastic

Combined Statistical-Mechanical Characterization of a Next Generation Textured PTFE for Extreme Environments

2018 ◽  
Author(s):  
Sannmit Shinde ◽  
Ali P. Gordon ◽  
Zachary Poust ◽  
Steve Pitolaj ◽  
Jim Drago ◽  
...  
Keyword(s):  
Extreme Environments ◽  
Viscoelastic Behavior ◽  
Ceramic Particle ◽  
Operating Conditions ◽  
Operating Environments ◽  
Linear Viscoelastic Behavior ◽  
Linear Viscoelastic ◽  
Statistical Mechanical ◽  
Relaxation Responses

Pressurized vessels that transfer media from one location to another often contain a bolted connection. Gaskets are essential for these systems since they confer high levels of leak mitigation across of range of operating environments (i.e., internal pressure and temperature). The balance of both sealability and compressibility must be displayed in candidate gasket materials to be subjected to aggressive operating conditions. Historically, thin gauge gasket (i.e., 1/16” thick) confer high sealability while thick gaskets offer superior compressibility (i.e., 1/8”). Fabricated with skive cut, ceramic particle-reinforced PTFE, these materials display linear viscoelastic behavior that allow consolidation to occur. For example, GYLON® 3504 is filled with Aluminosilicate Microspheres, GYLON®3510 is filled with barium sulfate, respectively, to efficiently fill crevices along the surfaces of the flange. Novel textured PTFE gasket (3504 EPX and 3510 EPX) have been developed to simultaneously confer sealability and compressibility compared to flat products. A design of experiments (DoE) approach is applied to characterize the factors that influence load relaxation responses of the both candidate textured PTFE (dual-face honeycomb) and existing (flat) gasket styles. Using an instrumented test platform analyzed. A new parameter is presented to quantify gasket efficiency. The collection of efficiency measurement methods and approach to re-torque optimization convey a novel framework that designers can invoke to facilitate improved flange performance.

Linear Viscoelastic Behavior of Symmetric and Asymmetric Star Polymer Solutions

2006 ◽  
Vol 39 (19) ◽  
pp. 6677-6685 ◽  
Author(s):  
Jung Hun Lee ◽  
Justin M. Goldberg ◽  
Lewis J. Fetters ◽  
Lynden A. Archer
Keyword(s):  
Polymer Solutions ◽  
Viscoelastic Behavior ◽  
Star Polymer ◽  
Linear Viscoelastic Behavior ◽  
Linear Viscoelastic

Effect of the chemical structure on the linear viscoelastic behavior of acrylic and styrenic polymer blends

2018 ◽  
Vol 67 ◽  
pp. 257-265 ◽  
Author(s):  
Juciklécia S. Reinaldo ◽  
Laurenice Martins Pereira ◽  
Erik dos Santos Silva ◽  
Marcelo M. Ueki ◽  
Edson N. Ito
Keyword(s):  
Polymer Blends ◽  
Chemical Structure ◽  
Viscoelastic Behavior ◽  
Linear Viscoelastic Behavior ◽  
Linear Viscoelastic ◽  
Styrenic Polymer

Structural response and sensitivity analysis of granular and asphaltic overlayment track considering linear viscoelastic behavior of asphalt

2021 ◽  
Vol 30 (1) ◽  
pp. 66-86
Author(s):  
Dian M. Setiawan
Keyword(s):  
Sensitivity Analysis ◽  
Layer Thickness ◽  
Tensile Strain ◽  
Viscoelastic Behavior ◽  
Structural Response ◽  
Rail Track ◽  
Binder Type ◽  
Linear Viscoelastic Behavior ◽  
Linear Viscoelastic ◽  
Subgrade Modulus

Abstract This study investigated the structural response of granular and asphaltic overlayment of rail track considering the linear viscoelastic behavior of asphalt. The calculation of the tensile strains at the bottom of the asphalt layer, the compressive stresses at the top of the subgrade layer, and the service life of the granular and the asphaltic overlayment rail track were conducted using the KENTRACK software. Furthermore, the sensitivity analysis by changing different factors was studied in this paper. The results of this study indicate that the asphaltic overlayment rail track structure has a much longer predicted service life than the granular rail track. It was also shown that the sub-grade compressive stress is more sensitive to the change in subgrade modulus than the change in ballast-sub-ballast-asphalt layer thickness and the change in binder type, respectively. In addition, the asphalt tensile strain is more sensitive to the change in asphalt layer thickness than the change in subgrade modulus and the change in binder type, respectively. These findings also enhance our understanding that subgrade compressive stress and asphalt tensile strain in the asphaltic overlayment track are more sensitive to the change in asphalt layer thickness than the change in binder type.

scholarly journals Supramolecular Polymer Brushes: Influence of Molecular Weight and Cross-Linking on Linear Viscoelastic Behavior

2020 ◽  
Vol 53 (12) ◽  
pp. 4810-4820
Author(s):  
Milad Golkaram ◽  
Evelyne van Ruymbeke ◽  
Giuseppe Portale ◽  
Katja Loos
Keyword(s):  
Molecular Weight ◽  
Polymer Brushes ◽  
Viscoelastic Behavior ◽  
Cross Linking ◽  
Supramolecular Polymer ◽  
Linear Viscoelastic Behavior ◽  
Linear Viscoelastic
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