Accession Number:

AD0723388

Title:

A Quasi-Static Investigation of Fiber-Reinforced Viscoelastic Materials,

Descriptive Note:

Corporate Author:

TEXAS UNIV AUSTIN ENGINEERING MECHANICS RESEARCH LAB

Report Date:

1970-06-01

Pagination or Media Count:

58.0

Abstract:

The purpose of this report is to examine the mathematical models that have been proposed for a particular class of fiber composites, and to use the results of a quasi-static experimental program to determine their range of applicability and their accuracy. The class of fiber composites chosen for this investigation was elastic, continuous fibers embedded in a linear viscoelastic matrix. The models chosen for consideration employ the macroscopic properties of the constituents to predict the gross properties of the composites. The construction of an effective modulus theory for the quasi- static analysis of fiber-reinforced viscoelastic materials was developed from two different lines of reasoning. The first approach, developed by Hashin and Rosen, uses the principle of minimum potential energy to predict the response of an elastic-elastic composite. Hashin then applies the correspondence principle of linear viscoelasticity to obtain the solution for elastic-viscoelastic composites. The second approach, developed by Nachlinger and Calvit, uses the continuum theory of mixtures to predict the effective modulus. Despite the two different approaches taken, the final results are in close agreement. The viscoelastic material chosen for this investigation was Solithane Resin 113. This resin was mixed with Urethane Resin Catalyst C113-300 to form a soft, rubbery material. The resin and catalyst were mixed in a 5050 ratio by weight. This matrix was reinforced with roving glass fibers and nylon 66 fibers. Author, modified-PL

Subject Categories:

  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE