Abstract

Nonwoven fabrics provide low cost reinforcement for composites. The consolidation behavior of E-glass nonwoven preforms and the mechanical properties of the resulting composites are studied. The reinforcement structures include stitch-bonded chopped-strand mat, powder-bonded chopped-strand mat, and continuous-strand mat. A woven fabric is also included for comparison. The bulkiness of the fabric influences their processibility in the hand lay-up and resin transfer molding (RTM) processes. Mechanical properties of specimens from the hand lay-up and the RTM processes are evaluated in tensile, compressive, and flexural tests. The test results and failure mechanisms are reported, and the effect of consolidation condition on the mechanical properties are analyzed. Theoretical analysis of the elastic properties of nonwoven composites are discussed. The tensile moduli from the experiment for such composites are compared with theoretical predictions and good agreement is observed.

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