Accession Number:

AD0274560

Title:

MAXIMUM STRAINS IN THE RESIN OF FIBERGLASS COMPOSITES

Descriptive Note:

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s):

Report Date:

1962-03-26

Pagination or Media Count:

12.0

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 gE sub r as the resin content is decreased to the limit for filling the interstices, where E sub g and E sub r are Youngs modulus for glass and resin, respectively. For shear strains the maximum strain concentration in the resin can beAS HIGH AS 0.7 G sub gG 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

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE