SYMPOSIA PAPER Published: 01 January 1972
STP27756S

Impact Resistance of Unidirectional Fiber Composites

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Composite micromechanics and macromechanics and the miniature Izod impact test are used to investigate the impact resistance of unidirectional composites. Several composite systems are examined both theoretically and experimentally. The composites are classified theoretically with respect to their impact resistance for longitudinal, transverse, and shear modes. Experimental results are reported only for Izod impact with the fibers either parallel or transverse to the cantilever longitudinal axis. Impact resistance design criteria which evolved during this investigation are used to design hybrid composites with improved impact resistance. This is illustrated theoretically and demonstrated experimentally. The results show that in situ fiber and matrix elongation to fracture, matrix modulus, fabrication process, fiber and void volume ratios, and microresidual stresses are variables which affect the impact resistance. The ranking of composite impact resistance on the basis of measured and predicted results is in excellent agreement.

Author Information

Chamis, CC
Lewis Research Center, National Aeronautics and Space Administration, Cleveland, Ohio
Hanson, MP
Lewis Research Center, National Aeronautics and Space Administration, Cleveland, Ohio
Serafini, TT
Lewis Research Center, National Aeronautics and Space Administration, Cleveland, Ohio
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Details
Developed by Committee: D30
Pages: 324–349
DOI: 10.1520/STP27756S
ISBN-EB: 978-0-8031-4606-8
ISBN-13: 978-0-8031-0134-0