A new finite‐element analysis approach for the prediction of minimum and maximum vibroacoustic response of solid–fluid systems

1998 ◽  
Vol 103 (5) ◽  
pp. 3021-3022
Author(s):  
Jean‐Sébastien Genot ◽  
François Charron ◽  
Noureddine Atalla
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Analysis Approach ◽  
Element Analysis ◽  
Fluid Systems ◽  
Vibroacoustic Response

Unveiling the origin of a nonequilibrium dynamic process detected by X-ray photon correlation spectroscopyviaa finite element analysis approach

2014 ◽  
Vol 70 (4) ◽  
pp. 338-347 ◽  
Author(s):  
Li Ma ◽  
Fan Zhang ◽  
Andrew Allen ◽  
Lyle Levine
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Analysis Approach ◽  
Element Analysis ◽  
Nonequilibrium Processes ◽  
Photon Correlation ◽  
X Ray ◽  
X Ray Scattering ◽  
Nonequilibrium Dynamic ◽  
Ray Scattering

It is a scientific and engineering challenge to characterize materials under nonequilibrium conditions. In recent years, X-ray photon correlation spectroscopy (XPCS), a synchrotron-based coherent X-ray scattering technique, has been found useful in determining the timescales associated with various nonequilibrium processes, with detailed descriptions of the underlying processes lacking. Here, both static ultra small angle X-ray scattering (USAXS) and dynamic USAXS-based XPCS were used to investigate a transient structural change (a nonequilibrium process) associated with an isothermal anneal in a glass polymer composite system. While the bulk USAXS technique lacked the required sensitivity to detect the change in the microstructures, the local structural reorganization was apparent in the XPCS study. The structural changes were modeled using a three-dimensional finite element analysis approach and wave-propagation theory was used to simulate the resulting reciprocal-space coherent scattering intensity. Qualitative agreement was found between the modeling and experimental results, which validates that stress relaxation in the viscous polymer matrix was responsible for the observed changes. This analysis demonstrates that multi-physics modeling of complex systems can be used to interpret XPCS measurements of nonequilibrium processes.

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