Inferring material parameters from imprecise experiments on soft materials by virtual fields method

2020 ◽  
Author(s):  
N. Afsar Kazerooni ◽  
Z. Wang ◽  
A. R. Srinivasa ◽  
J. C. Criscione
Keyword(s):  
Soft Materials ◽  
Virtual Fields Method ◽  
Material Parameters

Material Identification On Thin Shells Using the Virtual Fields Method, Demonstrated On the Human Eardrum

2021 ◽  
Author(s):  
Felipe Pires ◽  
Stephane Avril ◽  
Pieter Livens ◽  
Julio A. Cordioli ◽  
Joris Dirckx
Keyword(s):  
Experimental Data ◽  
Outer Surface ◽  
Plate Theory ◽  
Measurement Data ◽  
Total Strain ◽  
Virtual Fields Method ◽  
Material Parameters ◽  
Membrane Strain

Abstract Characterization of material parameters from experimental data remains challenging, especially on biological structures. One of such techniques allowing for the inverse determination of material parameters from measurement data is the Virtual Fields Method (VFM). However, application of the VFM on general structures of complicated shape has not yet been extensively investigated. In this paper, we extend the framework of the VFM method to thin curved solids in 3D, commonly denoted shells. Our method is then used to estimate theYoung's modulus and hysteretic damping of the human eardrum. By utilizing Kirchhoff plate theory, we assume that the behavior of the shell varies linearly through the thickness. The total strain of the shell can then be separated in a bending and membrane strain. This in turn allowed for an application of the VFM based only on data of the outer surface of the shell. We validated our method on simulated and experimental data of a human eardrum made to vibrate at certain frequencies. It was shown that the identified material properties were accurately determined based only on data from the outer surface and are in agreement with literature. Additionally, we observed that neither the bending nor the membrane strain in an human eardrum can be neglected and both contribute significantly to the total strain found experimentally.

scholarly journals Extension of the Optimised Virtual Fields Method to Estimate Viscoelastic Material Parameters from 3D Dynamic Displacement Fields

Strain ◽  
2015 ◽  
Vol 51 (2) ◽  
pp. 110-134 ◽  
Author(s):  
N. Connesson ◽  
E. H. Clayton ◽  
P. V. Bayly ◽  
F. Pierron
Keyword(s):  
Viscoelastic Material ◽  
Virtual Fields Method ◽  
Displacement Fields ◽  
Dynamic Displacement ◽  
Material Parameters
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