SciFi Innovations LLC — Department of Defense STTR Phase II: AF20A-TCSO1

Description

SciFi Innovations and OSU present a technology for joining carbon fiber reinforced polymers (CFRP) to metals with integrated sensing. This hybrid technology, termed smart carbon fiber integration (S-CFI, pronounced “sci fi”), provides multi-material aircraft structures that are more durable, inspectable, and maintainable than current alternatives.The key to S-CFI is that sensors and dry fibers are embedded in metal using a low temperature, solid state process. Mechanical interlocking of the fibers within the metal produces strong joints without damaging fibers as is the case with traditional through-thickness fasteners. Embedded devices such as fiber Bragg grating (FBG) sensors or electronic components provide prognostic and early damage detection data for both the joint and the CFRP structure. Fibers are embedded dry, enabling the layup of arbitrary CFRP parts with integrated metal tabs, ribs, or attachment points that can be joined to other metal or S-CFI structures using traditional metal-to-metal joining methods.  OSU's CFRP-metal joining technology is currently at TRL 6, having been prototyped as a vehicle roof stiffener. The metal-CFRP joints are shown to meet or exceed automotive standards for metal-to-metal resistive spot weld (RSW) attachments and to be immune to galvanic corrosion based on automotive-grade accelerated corrosion tests.