The structural response of unsymmetrically laminated composite cylinders

Technical Report · Tue Aug 01 04:00:00 EDT 1989

OSTI ID:5244682

Butler, T A; Hyer, M W

The responses of an unsymmetrically laminated fiber-reinforced composite cylinder to an axial compressive load, a torsional load, and the temperature change associated with cooling from the processing temperature to the service temperature are investigated. These problems are considered axisymmetric and the response is studied in the context of linear elastic material behavior and geometrically linear kinematics. Four different laminates are studied: a general unsymmetric laminate; two unsymmetric but more conventional laminates; and a conventional quasi-isotropic symmetric laminate. The responses based on closed-form solutions for different boundary conditions are computed and studied in detail. Particular emphasis is directed at understanding the influence of elastic couplings in the laminates. The influence of coupling decreased from a large effect in the general unsymmetric laminate, to practically no effect in the quasi-isotropic laminate. For example, the torsional loading of the general unsymmetric laminate resulted in a radial displacement. The temperature change also caused a significant radial displacement to occur near the ends of the cylinder. On the other hand, the more conventional unsymmetric laminate and the quasi-isotropic cylinder did not deform radially when subjected to a torsional load. From the results obtained, it is clear the degree of elastic coupling can be controlled and indeed designed into a cylinder, the degree and character of the coupling being dictated by the application.

• Research Organization: Maryland Univ., College Park, MD (USA)
• OSTI ID: 5244682
• Report Number(s): N-89-28856; NASA-CR--185834; NAS--1.26:185834; UM-TR--89-2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
BOUNDARY-VALUE PROBLEMS
COMPOSITE MATERIALS
CYLINDERS
EXPANSION
FIBERS
MATERIALS
MECHANICAL PROPERTIES
STRESS ANALYSIS
TEMPERATURE EFFECTS
TENSILE PROPERTIES
THERMAL EXPANSION
TORSION