Accession Number : AD0652359

Title :   MECHANICAL PROPERTIES OF WIRE REINFORCED GRAINS.

Descriptive Note : Technical rept.,

Corporate Author : COLUMBIA UNIV NEW YORK DEPT OF CIVIL ENGINEERING AND ENGINEERING MECHANICS

Personal Author(s) : Heller,R. A.

Report Date : MAR 1967

Pagination or Media Count : 77

Abstract : A large variety of experiments have been performed to evaluate the mechanical properties of simulated, wire reinforced solid propellants and to examine typical failure modes of such materials. It has been found that while axial compressive strength, hoop strength, fatigue, and torsion strength increase with aluminum content, axial tensile strength decreases for the tested configurations. Elastic moduli increase with wire content and relations between the various moduli are adequately described by orthotropic relationships. Failure modes are of four types: (1) In axial tension failure takes place by binder separation unless the reinforcing helix is very steep. (2) Hoop tension failure of the wire as a result of stress concentration on the inner surface produces premature failure under internal pressure. (3) In axial compression, longitudinal and diametral bending failure may be attributed to a lack of radial reinforcement. (4) In vibration tests heat generation due to inter-laminar shear and consequent thermal softening of the binder causes failure by delamination. (Author)

Descriptors :   (*ROCKET PROPELLANT GRAINS, REINFORCING MATERIALS), ALUMINUM, WIRE, MECHANICAL PROPERTIES, SOLID ROCKET PROPELLANTS, FAILURE(MECHANICS), TENSILE PROPERTIES, COMPRESSIVE PROPERTIES, BENDING, CREEP, EXPERIMENTAL DATA

Subject Categories : Solid Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE