Accession Number : ADA255765


Title :   The Stress Development during Filament Winding of Thick Cylinders


Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF ENGINEERING SCIENCE AND MECHANICS


Personal Author(s) : Hahn, H T ; Lee, S S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255765.pdf


Report Date : Aug 1992


Pagination or Media Count : 34


Abstract : The stress development during filament winding of thick composite cylinders has been studied using dry glass fiber tows. The thicknesses of the wound cylinders were more than 38 mm while the aluminum mandrel used had an outside diameter of 58 mm. Circumferential winding was used and the winding tension was varied between 4 and 23 N. The radial pressure measured at the mandrel surface using foil gages increased over the first 6 layers or so of winding, and then stayed constant or even decreased slightly with subsequent winding. Predictions based on elastic analyses were fitted to the data by varying the effective radial modulus. The resulting values of the radial modulus were much less than the circumferential modulus, the latter being more than ten- thousand times greater than the former. Such high anisotropy was responsible for the asymptotic increase of the mandrel pressure with winding. The calculated circumferential stress in the fibers was compressive throughout most of the inner part of the wound cylinder however, its magnitude was rather small. A higher winding tension resulted in a better compaction, and therefore, a smaller effective layer thickness, a higher radial modulus, and higher internal stresses. Under the winding conditions studied in the present work, fiber buckling due to the development of compressive circumferential stress does not appear possible.


Descriptors :   *FILAMENT WOUND CONSTRUCTION , *GLASS FIBERS , *WINDING , STRESSES , DIAMETERS , PREDICTIONS , TENSILE STRESS , GLASS , CYLINDRICAL BODIES , TENSION , MANDRELS , FILAMENTS , CREEP , PRESSURE , BUCKLING , ANISOTROPY , ALUMINUM , SURFACES , MODULUS OF ELASTICITY , LAYERS , THICKNESS , FIBERS


Subject Categories : Refractory Fibers
      Laminates and Composite Materials
      Textiles
      Structural Engineering and Building Technology


Distribution Statement : APPROVED FOR PUBLIC RELEASE