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Microstructurally Tailored Materials Improving Structural Performance

Sarvenaz Ghaffari, Guillaume Seon, Andrew Makeev, University of Texas at Arlington

https://doi.org/10.4050/F-0079-2023-18172

Abstract:
High-modulus (HM) carbon fiber-reinforced polymers (CFRPs) have attracted strong demand by the rotorcraft industry as such materials can potentially enable lightweight airframes and rotor components with significant weight savings. However, low fiber-direction compressive strength, compared to intermediate-modulus (IM) CFRPs currently used in primary structures, has been a well-recognized weakness of HM CFRPs, prohibiting their implementation in rotorcraft platforms. Microstructural tailoring provides an innovative means for breaking through the fiber-direction compressive strength barrier of the HM CFRPs. Microbuckling, the fiber-direction compressive failure mechanism of the subject HM and IM CFRPs, is driven by fiber-matrix interface shear strength. Assessment of the interface properties using in-situ SEM-based experiments reveal substantial difference in surface topology between IM and HM fibers, which is related to higher interface strength in HM fibers. This instigates a microstructural tailoring approach of reinforcing material surrounding HM fibers with IM fibers to improve microstructural stability. A manufacturing system has been developed, and promising results enabling HM CFRPs with adequate fiber-direction compressive strength have been achieved through hybridization of IM and HM fibers at the filament level in HM CFRP toughened with nano-silica. A new material achieving compressive strength of IM CFRPs but with >30% higher modulus has been developed.


Microstructurally Tailored Materials Improving Structural Performance

  • Presented at Forum 79
  • 8 pages
  • SKU # : F-0079-2023-18172
  • Structures and Materials

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Microstructurally Tailored Materials Improving Structural Performance

Authors / Details:
Sarvenaz Ghaffari, Guillaume Seon, Andrew Makeev, University of Texas at Arlington