Application of the method of influence functions in problems of the theory of cracks for anisotropic plates

1993 ◽  
Vol 34 (3) ◽  
pp. 410-418 ◽  
Author(s):  
V. N. Maksimenko
Keyword(s):  
Influence Functions ◽  
Anisotropic Plates

scholarly journals Adaptive Shell Spherical Reflector Actuated with PVDF-TrFE Thin Film Strain Actuators

Actuators ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 7
Author(s):  
Kainan Wang ◽  
Thomas Godfroid ◽  
Damien Robert ◽  
André Preumont
Keyword(s):  
Thin Film ◽  
Active Material ◽  
Quadratic Model ◽  
Influence Functions ◽  
Regularization Technique ◽  
Thin Polymer ◽  
Optical Modes ◽  
Electrostrictive Material ◽  
Ill Conditioning ◽  
Good Agreement

This paper discusses the design and manufacturing of a thin polymer spherical adaptive reflector of diameter D=200 mm, controlled by an array of 25 independent electrodes arranged in a keystone configuration actuating a thin film of PVDF-TrFE in d31-mode. The 5 μm layer of electrostrictive material is spray-coated. The results of the present study confirm that the active material can be modelled by a unidirectional quadratic model and that excellent properties can be achieved if the material is properly annealed. The experimental influence functions of the control electrodes are determined by a quasi-static harmonic technique; they are in good agreement with the numerical simulations and their better circular symmetry indicates a clear improvement in the manufacturing process, as compared to a previous study. The low order optical modes can be reconstructed by combining the 25 influence functions; a regularization technique is used to alleviate the ill-conditioning of the Jacobian and allow to approximate the optical modes with reasonable voltages.

scholarly journals Defect detection in anisotropic plates based on the instantaneous phase of signals

2015 ◽  
Vol 62 (10) ◽  
pp. 1888-1894 ◽  
Author(s):  
Vander Teixeira Prado ◽  
Silvio Cesar Garcia Granja ◽  
Ricardo Tokio Higuti ◽  
Claudio Kitano ◽  
Oscar Martinez-Graullera ◽  
...  
Keyword(s):  
Defect Detection ◽  
Anisotropic Plates ◽  
Instantaneous Phase

Variational equations for structurally anisotropic plates

1973 ◽  
Vol 9 (5) ◽  
pp. 527-531
Author(s):  
L. V. Endzhievskii ◽  
N. P. Abovskii
Keyword(s):  
Variational Equations ◽  
Anisotropic Plates
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