Quasi-Isotropic Reinforcement in a Single Braid Layer Quasi-Isotropic Reinforcement in a Single Braid Layer Symmetric and Balanced with One Ply Symmetric and Balanced with One Ply 0° (axial) -60° (bias) +60° (bias) 33% Uniform Stiffness In All Directions
I-65 Bridge Repair Applications
QISO TM – Every Ply Balanced & Symmetric 1 layer braid 4 layers woven or 8 layers tape QISO allows for decreased layup time Reduced thickness, less weight 0/90 ± 45 0/90 ±45 Why QISO?
Using QISO over changing cross-sections, there is: Reduced Concern Over Fiber Misalignment Simplicity In Design, Manufacturing, and Quality Why QISO?
Widths To Optimize Utilization Areal Weights / Thickness Yarn Type Hybrids Fiber Orientation Strategic Axial Placement Customization
(Hybrid Materials) Alternating Fiberglass & Carbon Fibers in Bias & Axial Positions Uniform Tool Surface – CTE is maintained with single balanced lamina Huge material costs savings & layup costs savings Customization
Fabric end-contouring Biaxial fiber -end domes Biaxial fiber -end domes Unidirectional + Biaxial fibers for hoop section Customization (Hybrid Architectures)
(Tailored prepreg) Customization
Significant material characterization done in various research efforts Several epoxy systems tested (PR520, 3502, 5208, 862/W), Vinyl Ester (Derakane 411) and Phenolic Primarily in-plane properties at room temperature Detailed data can be supplied upon request QISO Properties
Resources Contacts: Pam Schneider: Dave Kehrl: A&P Technology