An investigation of initial yield surfaces for unidirectional reinforced composites.
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Authors
Ericson, Walter Alfred.
Subjects
composite materials
laminates
reinforcing fibers
yield surface
micromechanics
macromechanics
laminates
reinforcing fibers
yield surface
micromechanics
macromechanics
Advisors
Salinas, David
Date of Issue
1972-03
Date
March 1972
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
Initial yield surfaces of unidirectional fiber reinforced composites subjected to combined longitudinal, transverse normal, and longitudinal shear loads are calculated. The composite is composed of filaments arranged in a periodic square array embedded in a matrix material. The constituent materials are assumed to be homogeneous and isotropic, while the composite is assumed to be macroscopically homogeneous and transversely isotropic. The finite element method, using linear strain triangles, is employed to calculate the stresses throughout the composite. Von Mises yield criterion is used to calculate the elastic limit of the local microscopic combined stresses in the composite. A parametric evaluation is carried out by changing individual constituent properties and evaluating the effect of this variation of the composite properties. Yield surfaces for several functional composites are included, as well as a computer program, in FORTRAN IV language, for the calculation of a yield surface.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.