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Microstructural Evaluation of Aligned, Short Fiber TUFF Material
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2019
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Materials ScienceEngineeringMechanical PropertiesFiber StructureMechanical EngineeringTailorable Universal FeedstockTuff MicrostructureFiber SpinningFiber ScienceFiber ChemistryMaterial MechanicsMicrostructural EvaluationMechanics Of MaterialsMicrostructureFiber LengthMechanics Modeling
The Tailorable Universal Feedstock for Forming (TuFF) material is comprised of highly aligned discontinuous fibers that achieves a high level of mechanical properties with large in-plane extensibility for forming of complex geometries. The paper characterizes the TuFF microstructure in terms of areal weight and fiber volume fraction and statistical distributions of fiber length, fiber-fiber spacing and fiber alignment using microscopy and X-ray Computed-Tomography with custom developed algorithms for data reduction. The TuFF program has demonstrated full property translation of stiffness and strength compared to continuous prepreg (60% fiber volume fraction) when 95% of all fibers are aligned within 5° and have a minimum fiber aspect ratio (length over diameter) of 600.