Analysis of Russian "Vertex" High-Strength Glass Fiber

Report No. ARL-TR-2045
Authors: Spurgeon, William A.; Rigas, Elias J.; Burkins, Matthew S.
Date/Pages: September 1999; 51 pages
Abstract: This report presents the results of mechanical and ballistic tests required in MIL-PRF-46l9?A (U.S. Department of the Army, "A Laminate, High Strength Glass Fiber Reinforced Polyester Resin," U.S. Army Research Laboratory, Aberdeen Proving Ground, MD, 16 April 1997) on Russian Vertex high-strength glass that is supposed to be equivalent to domestic S-2 glass. The results of tensile tests of 250-yield yarns of both types of fibers were very similar, with the Vertex glass possibly as much as 2% stronger. For fabricating composites, however, a pseudo-250-yield yarn made by combining three 750-yield yarns was woven to make the fabrics used in the polyester resin composites for the mechanical and ballistic tests. This pseudo-250-yield yarn was about 7% weaker than the true 250-yield yarns. The tensile strength of the composites and the ballistic performance vs. a 20-mm fragment-simulating projectile (FSP) were both below the requirements of the specification, probably as a consequence of the use of this weaker yarn. The flexure and shear properties of the composites just met the specification, while the compressive strength was about 12% low. These results suggest that the sizing needs some fine-twung to improve the performance of the Vertex glass fibers.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 1999