Genetic algorithm reconstruction of orthotropic composite plate elastic constants from a single non-symmetric plane ultrasonic velocity data

2007 ◽  
Vol 38 (2) ◽  
pp. 216-227 ◽  
Author(s):  
J. Vishnuvardhan ◽  
C.V. Krishnamurthy ◽  
Krishnan Balasubramaniam
Keyword(s):  
Genetic Algorithm ◽  
Ultrasonic Velocity ◽  
Elastic Constants ◽  
Composite Plate ◽  
Velocity Data ◽  
Orthotropic Composite ◽  
Symmetric Plane

Characterization of Composite Materials Using an Inverse Technique

2007 ◽  
Vol 345-346 ◽  
pp. 1299-1302
Author(s):  
Shun Fa Hwang ◽  
Cyuan Kuan Yeh ◽  
Rong Song He
Keyword(s):  
Genetic Algorithm ◽  
Finite Element ◽  
Numerical Method ◽  
Elastic Constants ◽  
Composite Plate ◽  
Hybrid Genetic Algorithm ◽  
Composite Plates ◽  
Vibration Testing ◽  
Element Analysis ◽  
Inverse Technique

Combining vibration testing and numerical method is a potential inverse technique for determining elastic constants of materials because of its nondestructive characteristic, single test, and producing average properties. In order to simplify the modeling processes and to reduce complicated derivation in the numerical method, the combination of finite element analysis and optimum design is adopted in this work. A finite element package, ANSYS, is used to do the modal analysis of the composite plate. A hybrid genetic algorithm, in which a simulated annealing mutation process and adaptive mechanisms are added to the real-parameter genetic algorithm, is used to search the possible elastic constants. After obtaining the natural frequencies of the composite plates from vibration testing, this inverse technique could predict the elastic constants of the composite plate. The inverse technique is verified by comparing with other methods and by determining the elastic constants of aluminum plates, and the excellence of including the hybrid genetic algorithm is proved. The results also indicate that the present technique could obtain very accurate elastic constants of composite plates.

Elastic Constants of Composite Materials by an Inverse Determination Method Based on A Hybrid Genetic Algorithm

2010 ◽  
Vol 26 (3) ◽  
pp. 345-353 ◽  
Author(s):  
S.-F. Hwang ◽  
J.-C. Wu ◽  
Evgeny Barkanovs ◽  
Rimantas Belevicius
Keyword(s):  
Genetic Algorithm ◽  
Elastic Constants ◽  
Hybrid Genetic Algorithm ◽  
Transversely Isotropic ◽  
Determination Method ◽  
Element Analysis ◽  
Plane Shear ◽  
Effective Elastic Constants ◽  
Testing Data ◽  
Out Of Plane

AbstractA numerical method combining finite element analysis and a hybrid genetic algorithm is proposed to inversely determine the elastic constants from the vibration testing data. As verified from composite material specimens, the repeatability and accuracy of the proposed inverse determination method are confirmed, and it also proves that the concept of effective elastic constants is workable. Moreover, three different sets of assumptions to reduce the five independent elastic constants to four do not make clear difference on the obtained results by the proposed method. In addition, to obtain robust values of the five elastic constants for a transversely isotropic material, it is recommended to use the out-of-plane Poisson's ratio instead of the out-of-plane shear modulus as the fifth one.

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