Toward Variability Characterization and Statistic Models’ Constitution for the Prediction of Exponentially Graded Plates’ Static Response

Journal of Composites Science

MariaAmélia Ramos Loja¹  Rafaelda Silva Batista Rosa²  AldaCristina Jesus Valentim Nunes de Carvalho³ 

[1] Grupo de Investigação em Modelação e Optimização de Sistemas Multifuncionais (GI-MOSM), IDMEC-Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal;Grupo de Investigação em Modelação e Optimização de Sistemas Multifuncionais (GI-MOSM), ISEL-Instituto Superior de Engenharia de Lisboa, 1959-007 Lisboa, Portugal;Grupo de Investigação em Modelação e Optimização de Sistemas Multifuncionais (GI-MOSM), Instituto Superior de Engenharia de Lisboa, CEMAPRE, ISEG, Universidade de Lisboa, 1200-781 Lisboa, Portugal;

关键词: functionally graded materials;    exponential law;    static analysis;    parametric uncertainty characterization;    response variability;    multiple linear regression models;   

DOI  :  10.3390/jcs2040059

来源: DOAJ

【 摘 要 】

Functionally graded composite materials may constitute an advantageous alternative to engineering applications, allying a customized tailoring capability to its inherent continuous properties transition. However, these attractive characteristics must account for the uncertainty that affects these materials and their structures’ physical quantities. Therefore, it is important to analyze how this uncertainty will modify the foreseen deterministic response of a structure that is built with these materials, identifying which of the parameters are responsible for a greater impact. To pursue this main objective, the material and geometrical parameters that characterize a plate made of an exponentially graded material are generated according to a random multivariate normal distribution, using the Latin hypercube sampling technique. Then, a set of finite element analyses based on the first-order shear deformation theory are performed to characterize the linear static responses of these plates, which are further correlated to the input parameters. This work also considers the constitution of statistic models in order to allow their use as alternative prediction models. The results show that for the plates that were analyzed, the uncertainty associated with the elasticity modulus of both phases is mainly responsible for the maximum transverse deflection variability. The effectiveness of the statistical models that are built are also shown.

【 授权许可】

Unknown