Finite Element Micromechanical Analysis of a Unidirectional Composite Including Longitudinal Shear Loading.
Abstract
A microscopic region of a unidirectional composite is modeled by a finite element micromechanical analysis using a generalized plane strain formulation, but including longitudinal shear loading. The analysis is capable of treating elastic, transversely isotropic fiber materials, as well as isotropic, elastoplastic matrix materials. Matrix material properties are considered to be temperature- and/or moisture-dependent. A special Gaussian elimination procedure is modified for the present treatment. Stresses are calculated for each element and appropriate failure criteria invoked. First-element failure is the limit of the present analysis. Other possible forms of results are: unidirectional composite properties, overall composite stress-strain response, and various plots of internal stress contours. The longitudinal shear loading capability permits the analysis of shear response of unidirectional composites in the fiber direction. Solid rod torsion test data used to obtain experimental verification indicate good agreement with the theoretical predictions for glass/epoxy and graphite/epoxy at various temperature and moisture conditions. In conjunction with a laminated plate point stress analysis, the present micromechanical analysis has been used to predict the stress-strain response into the inelastic range of a graphite/epoxy (+ or - 45)4s laminate. Available experimental data for various environmental conditions indicate excellent agreement with the analytical predictions. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1981
- Accession Number
- ADA097811
Entities
People
- David A. Crane
- Donald F. Adams
Organizations
- University of Wyoming