Kevlar shear properties

Table 2.30 Shear Properties of Composites of Kevlar 49 Fiber in Epoxy Resins (8) ...

Because of their heterogeneous nature and, sometimes, extreme anisotropy it has been necessary to develop special test methods for composite materials (Mayer, 1993). This work is still underway, as is the debate on which methods are preferred. The effects of test method, shape and fibre orientation on the measured shear properties of Kevlar 49 fibre composites are given in Table 5.11. 

The relevant properties of these materials for the torsional-mechanical analysis are listed in Table 8.11. On the basis of specific elastic modulus and specific shear modulus, the best materials are the graphite-fiber-reinforced epoxy resin, followed by either of the alloys, then the Kevlar fiber-reinforced epoxy. The chopped glass sheet molding compound is obviously not a good choice. 

Kitano, T., Hashmi, S. A. R., and Chand, N. 2004. Influence of steady shear flow on dynamic viscoelastic properties of un-reinforced and Kevlar, glass fiber reinforced LLDPE. Bull. Mater. Sci. 27(5) 409-415. 

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