Accession Number : AD0274560

Title :   MAXIMUM STRAINS IN THE RESIN OF FIBERGLASS COMPOSITES

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : KIES,J.A.

Report Date : 26 MAR 1962

Pagination or Media Count : 12

Abstract : A simple analysis was made of models representing possible conditions in glass-fiber-reinforced plastics. The analysis shows that for strains imposed in a direction transverse to a set of windings, the ratio of tensile strain in the resin to the average measured strain can approach E sub g/E sub r as the resin content is decreased to the limit for filling the interstices, where E sub g and E sub r are Young's modulus for glass and resin, respectively. For shear strains the maximum strain concentration in the resin can beAS HIGH AS 0.7 G sub g/G sub r, where G sub g and G sub r are the shear moduli of glass and resin. Measured average strains in service are as high as two percent. The strain in the resin in a direction transverse to the fibers is correspondingly about 40%. No resin in ordinary structural use can stand this strain without cracking. (Author)

Descriptors :   *COMPOSITE MATERIALS, *LAMINATES, *PLASTICS, CRAZING, DEFORMATION, FIBERS, GLASS TEXTILES, MATHEMATICAL ANALYSIS, REINFORCING MATERIALS, STRESSES

Distribution Statement : APPROVED FOR PUBLIC RELEASE