Composite Materials

· For the linear shear stress model the critical transfer length is: L_c = (σ^*_f r / τ).
· The average fiber stress < σ_f > may be used as a comparison between short fiber reinforced composites & continuous fiber composites.

· For the linear loading model and a fiber longer than the critical transfer length loaded to just below the fiber fracture stress, the mean fiber stress is:

so that: <σ_f> = σ_f^*{ 1 - (L_c / 2L)}