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Development of constitutive laws for whisker reinforced ceramics: A neural network approach

DSpace at IIT Bombay

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Title Development of constitutive laws for whisker reinforced ceramics: A neural network approach
 
Creator RAO, HS
DESHPANDE, JM
MUKHERJEE, A
 
Subject matrix composites
mechanical-properties
silicon-carbide
behavior
 
Description The formulation of constitutive laws for ceramic-matrix-composites (CMCs) using the mathematical treatment involving arbitrary scalar constants is a difficult task due to a large number of parameters, their complex interaction, and involvement of a weak bi-material interface in the mechanics of failure. A weak bi-material interface is necessary in the case of CMCs to avoid catastrophic failure. Because of the presence of such weak interface, slip and debonding occurs at the interface making the mechanics complex As a result, analytical models to simulate the material behaviour become rather complicated, involving a number of equations for modelling the material behaviour. Further, a number of scalar constants are used in these equations to include the material non-linearity. Calibration of these constants warrants a comprehensive experimentation, which is very difficult in case of ceramic composites due to a variety of reasons. In the present paper, a novel approach to modelling the behaviour of whisker reinforced CMCs, using the artificial neural networks approach, was presented. An artificial neural network was used to postulate the constitutive law for Al2O3 (matrix)/SiC (whisker) composite. Finite element analysis was carried out to generate the training examples for the network. The singularities on the output surface were successfully taught to the network using a hybrid training strategy involving manual as well as automatic learning. The network training is demonstrated and the validation of the network constitutive model for new examples is presented.
 
Publisher FREUND PUBLISHING HOUSE LTD
 
Date 2011-07-29T20:19:58Z
2011-12-26T12:52:37Z
2011-12-27T05:39:03Z
2011-07-29T20:19:58Z
2011-12-26T12:52:37Z
2011-12-27T05:39:03Z
1997
 
Type Article
 
Identifier SCIENCE AND ENGINEERING OF COMPOSITE MATERIALS, 6(4), 225-245
0334-181X
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7819
http://hdl.handle.net/10054/7819
 
Language en