Comparative Assessment between Implicit and Explicit Frequency-Dependent Finite-Element Time-Domain Methods for Metallic Nanostructures Analysis

2005 ◽  
Author(s):  
V. F. Rodríguez-Esquerre ◽  
Masanori Koshiba ◽  
H. E. Hernández-Figueroa
Keyword(s):  
Finite Element ◽  
Time Domain ◽  
Metallic Nanostructures ◽  
Comparative Assessment ◽  
Frequency Dependent ◽  
Implicit And Explicit

scholarly journals Investigation of the Compressive Viscoelastic Properties of Brain Tissue Under Time and Frequency Dependent Loading Conditions

2021 ◽  
Author(s):  
Weiqi Li ◽  
Duncan E. T. Shepherd ◽  
Daniel M. Espino
Keyword(s):  
Finite Element ◽  
Brain Tissue ◽  
Time Domain ◽  
Viscoelastic Properties ◽  
Loss Modulus ◽  
Series Representation ◽  
Experimental Tests ◽  
Finite Element Models ◽  
Frequency Dependent

AbstractThe mechanical characterization of brain tissue has been generally analyzed in the frequency and time domain. It is crucial to understand the mechanics of the brain under realistic, dynamic conditions and convert it to enable mathematical modelling in a time domain. In this study, the compressive viscoelastic properties of brain tissue were investigated under time and frequency domains with the same physical conditions and the theory of viscoelasticity was applied to estimate the prediction of viscoelastic response in the time domain based on frequency-dependent mechanical moduli through Finite Element models. Storage and loss modulus were obtained from white and grey matter, of bovine brains, using dynamic mechanical analysis and time domain material functions were derived based on a Prony series representation. The material models were evaluated using brain testing data from stress relaxation and hysteresis in the time dependent analysis. The Finite Element models were able to represent the trend of viscoelastic characterization of brain tissue under both testing domains. The outcomes of this study contribute to a better understanding of brain tissue mechanical behaviour and demonstrate the feasibility of deriving time-domain viscoelastic parameters from frequency-dependent compressive data for biological tissue, as validated by comparing experimental tests with computational simulations.

Frequency-dependent envelope finite-element time-domain analysis of dispersion materials

2004 ◽  
Vol 44 (1) ◽  
pp. 13-16 ◽  
Author(s):  
V. F. Rodríguez-Esquerre ◽  
Masanori Koshiba ◽  
H. E. Hernández-Figueroa
Keyword(s):  
Finite Element ◽  
Time Domain ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Frequency Dependent ◽  
Analysis Of Dispersion
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