Title page for ETD etd-11092012-040116


Type of Document Master's Thesis
Author Cooper, David E.
URN etd-11092012-040116
Title Stresses and deformations in cross-ply composite tubes subjected to circumferential temperature gradients
Degree Master of Science
Department Engineering Mechanics
Advisory Committee
Advisor Name Title
Hyer, Michael W. Committee Chair
Herakovich, Carl T. Committee Member
Johnson, Eric R. Committee Member
Keywords
  • Deformations (Mechanics)
Date of Defense 1985-07-05
Availability restricted
Abstract

The stresses and deformations in cross—ply composite tubes subjected in circumferential temperature gradients are studied. The motivation behind the study is the anticipated use of composite tubes in space structures where the tube is exposed to the heat of the sun on one side and the cryogenic temperatures of space on the other. Experiments were performed to measure the functional form of the temperature gradient and the displacements. It was found that the form of the temperature gradient, T(θ), can accurately be represented by T(θ) = A + Bcosθ and that the displacement of the tube is parabolic in the axial coordinate. Two types of analytical solutions were developed: an exact elasticity U solution and an approximate solution. The approximate solution includes a linear variation of the material properties with temperature and uses the principle of complementary virtual work in conjunction with a Ritz approximation on the stress field. The elasticity solution predicts that high tensile stresses could crack the matrix. The effect of including temperature-dependent material properties is to reduce the circumferential dependency of the stresses.

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