Determination of relaxation modulus of time-dependent materials using neural networks

Alexandra Aulova (Author), Edvard Govekar (Author), Igor Emri (Author)

Abstract

Health monitoring systems for plastic based structures require the capability of real time tracking of changes in response to the time-dependent behavior of polymer based structures. The paper proposes artificial neural networks as a tool of solving inverse problem appearing within time-dependent material characterization, since the conventional methods are computationally demanding and cannot operate in the real time mode. Abilities of a Multilayer Perceptron (MLP) and a Radial Basis Function Neural Network (RBFN) to solve ill-posed inverse problems on an example of determination of a time-dependent relaxation modulus curve segment from constant strain rate tensile test data are investigated. The required modeling data composed of strain rate, tensile and related relaxation modulus were generated using existing closed-form solution. Several neural networks topologies were tested with respect to the structure of input data, and their performance was compared to an exponential fitting technique. Selected optimal topologies of MLP and RBFN were tested for generalization and robustness on noisy data; performance of all the modeling methods with respect to the number of data points in the input vector was analyzed as well. It was shown that MLP and RBFN are capable of solving inverse problems related to the determination of a time dependent relaxation modulus curve segment. Particular topologies demonstrate good generalization and robustness capabilities, where the topology of RBFN with data provided in parallel proved to be superior compared to other methods.

Keywords

relaxation modulus;inverse problem;neural networks;multilayer perceptron;radial basis function neural network;structural health monitoring;

Data

Language:	English
Year of publishing:	2017
Typology:	1.01 - Original Scientific Article
Organization:	UL FS - Faculty of Mechanical Engineering
UDC:	681.5(045)
COBISS:	15013147
ISSN:	1385-2000
Views:	1822
Downloads:	950
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	relaksacijski moduli;nevronske mreže;večplastni perceptron;monitoring stanja stuktur;
Type (COBISS):	Article
Embargo end date (OpenAIRE):	2018-10-21
Pages:	str. 331-349
Volume:	ǂVol. ǂ21
Issue:	ǂiss. ǂ3
Chronology:	avg. 2017
DOI:	10.1007/s11043-016-9332-x
ID:	10999473