DEVELOPMENT OF IMPROVED HIGH-STRENGTH PREIMPREGNATED MATERIALS FOR FILAMENT-WOUND ROCKET MOTOR CASES
Abstract
Lot 7 dry roving and Lots 2, 4 and 5 prepreg were evaluated for strand ten tensile strength and NOL ring tensile strength. Lot 7 was 20E roving with approximately 408 filaments per end and was finished with HTS sizing. Standard 20E roving has 204 filaments per end. The average strand tensile strength for this lot was 334,800 psi and the average NOL ring strength was 322, 800 psi. No advantage in strength was indicated by the fiber of smaller diameter. However, an 18in.-diam chamber fabricate from this material appeared very uniform and had an unusually smooth surface. Lots 4 and 5 prepreg had strand tensile strengths of slightly over 320,000 psi and NOL ring strengths of 336,000 psi and 349,000 psi respectively. The NOL ring strength is between 5 and 10% higher than the strand strength. The opposite is true of the dry glass. A curvilinear athematical model used in the statistical analysis of dry glass strength data accounted for 75% of the strength variation. Weight per yard and fuzz content are the most significant variables to be controlled in obtaining higher tensile strengths.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 27, 1962
- Accession Number
- AD0273991
Entities
Organizations
- Aerojet Rocketdyne Holdings