Finite element analysis of anisotropic viscoelastic composite structures and analytical determination of optimum viscoelastic material properties

Quasi-static linear anisotropic viscoelastic responses of composite structures subjected to mechanical and hygrothermal loads are formulated in terms of finite element algorithms. Laplace and/or Fourier transforms rather than direct time integrations are used in this formulation in order to improve accuracy and to save extensive computational time and storage. The present quasi-static viscoelastic analyses require the same computer memory as is needed for corresponding elastic eigenvalue problems. Bending and stretching of composite plates for which analytical solutions exist are examined in order to evaluate the accuracy and effectiveness of the present approach. The time dependent displacement fields in the transverse direction for the cross ply and angle ply laminates are calculated and the stacking sequence effects of the laminates are discussed in detail. Creep responses for GY70/339 composite laminates with or without a circular hole are also studied. The numerical results compare favorably with analytical solutions, i.e. within 1.8% for bending and 10$\sp{-3}$% for tension.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Aerospace Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Yi, Sung

Contributors dc:contributor

• Hilton, Harry H.

• Engineering, Aerospace
• Engineering, Civil
• Engineering, Materials Science

Statement dc:rights

• Copyright 1992 Yi, Sung

Language dc:language

eng

Identifier

AAI9215915
(UMI)AAI9215915

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/21724